USB-1616FS
Analog Input and Digital I/O

User's Guide

June 2021. Rev 10© Measurement Computing Corporation

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USB-1616FS

Table of Contents
Preface

About this User's Guide ..................................................................................................................... 5
What you will learn from this user's guide ..................................................................................................... 5
Conventions in this user's guide ..................................................................................................................... 5
Where to find more information..................................................................................................................... 5
Chapter 1

Introducing the USB-1616FS.............................................................................................................. 6
Functional block diagram .............................................................................................................................. 7
Chapter 2

Installing the USB-1616FS.................................................................................................................. 8
Unpacking ..................................................................................................................................................... 8
Installing the software.................................................................................................................................... 8
Installing the hardware .................................................................................................................................. 8Connecting the external power supply ................................................................................................................................... 8Connecting the USB-1616FS.................................................................................................................................................. 8

Chapter 3

Functional Details ............................................................................................................................. 10
Analog input acquisition modes ................................................................................................................... 10

Software paced ...................................................................................................................................................................... 10
Hardware paced ..................................................................................................................................................................... 10
Burst scan .............................................................................................................................................................................. 10

Board components ....................................................................................................................................... 11

USB OUT connector ............................................................................................................................................................. 11
USB IN connector ................................................................................................................................................................. 11External power connectors .................................................................................................................................................... 11
USB LED ............................................................................................................................................................................... 12PWR LED .............................................................................................................................................................................. 12
Screw terminals ..................................................................................................................................................................... 12

Signal connections ....................................................................................................................................... 13

Analog inputs......................................................................................................................................................................... 13
Digital I/O .............................................................................................................................................................................. 14
Counter input ......................................................................................................................................................................... 14
Trigger input .......................................................................................................................................................................... 14
SYNC I/O .............................................................................................................................................................................. 15Power output .......................................................................................................................................................................... 15
Ground terminals ................................................................................................................................................................... 15

Daisy chaining additional devices ................................................................................................................ 15

Sample rate limitations .......................................................................................................................................................... 15Power limitations................................................................................................................................................................... 16

Accuracy ..................................................................................................................................................... 16
Synchronized operations .............................................................................................................................. 18
Mechanical drawings ................................................................................................................................... 19
Chapter 4

Specifications.................................................................................................................................... 20
Analog input ................................................................................................................................................ 20

Single board throughput ........................................................................................................................................................ 21
Multiple board throughput .................................................................................................................................................... 21

Digital input/output ..................................................................................................................................... 22External trigger............................................................................................................................................ 23
External clock input/output .......................................................................................................................... 233

USB-1616FS User's Guide

About this User's Guide

Counter........................................................................................................................................................ 24
Memory ....................................................................................................................................................... 25
Indicator LEDs ............................................................................................................................................ 25
Power .......................................................................................................................................................... 25
USB +5V voltage ........................................................................................................................................ 25
External power input ................................................................................................................................... 26
External power output.................................................................................................................................. 26
USB specifications ...................................................................................................................................... 26
Environmental ............................................................................................................................................. 26
Mechanical .................................................................................................................................................. 27
Screw terminals ........................................................................................................................................... 27
EU Declaration of Conformity .......................................................................................................... 28
EU Declaration of Conformity, Legacy Hardware .......................................................................... 29

4

Preface

About this User's Guide
What you will learn from this user's guideThis user's guide describes the Measurement Computing USB-1616FS data acquisition device and lists device
specifications.

Conventions in this user's guide
For more information
Text presented in a box signifies additional information related to the subject matter.
Caution! Shaded caution statements present information to help you avoid injuring yourself and others,
damaging your hardware, or losing your data.
Bold text is used for the names of objects on a screen, such as buttons, text boxes, and check boxes.

Italic text is used for the names of manuals and help topic titles, and to emphasize a word or phrase.

Where to find more information
Additional information about USB-1616FS hardware is available on our website at www.mccdaq.com. You canalso contact Measurement Computing Corporation with specific questions.


Knowledgebase: kb.mccdaq.com
Tech support form: www.mccdaq.com/support/support_form.aspx
Email: techsupport@mccdaq.com
Phone: 508-946-5100 and follow the instructions for reaching Tech Support

For international customers, contact your local distributor. Refer to the International Distributors section on our
website at www.mccdaq.com/International.

5Introducing the USB-1616FS

Chapter 1

The USB-1616FS is a USB 2.0 full-speed device supported under popular Microsoft® Windows® operating
systems. The USB-1616FS is compatible with USB 3.0.
The USB-1616FS provides true simultaneous sampling of up to sixteen 16-bit single-ended analog inputs.
Simultaneous input sampling is accomplished through the use of one A/D converter per channel. The device
features sampling rates of up to 50 kS/s per channel, and up to 9500 S/s per channel throughput for all channels.
You can configure the analog input range of each channel independently via software. An onboard temperature
sensor lets you monitor your environment temperature.
Eight digital IO lines are independently selectable as input or output. A 32-bit counter can count TTL pulses. A
SYNC (synchronization) control line lets you connect two USB-1616FS devices and acquire datasynchronously from 32 analog inputs.
The USB-1616FS is powered by an external +9 V unregulated power supply that is shipped with the board.
Power and USB connectors let you power and control multiple MCC USB Series products from one external
power source and one USB port in a daisy chain fashion.
The USB-1616FS is enclosed in a rugged housing that you can mount on a DIN rail or on a bench.

6

USB-1616FS User's Guide

Introducing the USB-1616FS

Functional block diagram
USB-1616FS functions are illustrated in the block diagram shown here.

Figure 1. USB-1616FS functional block diagram

7

Chapter 2

Installing the USB-1616FS
UnpackingAs with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the board from its packaging, ground yourself using a wrist strap or by simply
touching the computer chassis or other grounded object to eliminate any stored static charge.

Installing the software
Refer to the MCC DAQ Quick Start and the USB-1616FS product page on our website for information about
the available software.
Install the software before you install your device
The driver needed to run the USB-1616FS is installed with the software. Therefore, you need to install thesoftware package you plan to use before you install the hardware.

Installing the hardware
Before you connect the USB-1616FS to your computer, connect the external power supply that was shippedwith the device.
You can connect up to four MCC USB Series devices in a daisy chain configuration to a single USB 2.0 port onyour computer. If your system has a USB 1.1 port, you can connect up to two MCC USB Series devices.

Connecting the external power supply
Power to the USB-1616FS is provided with the +9 V external power supply (CB-PWR-9V3A). Connect theexternal power supply before connecting the USB cable to the USB-1616FS and to the computer.
Complete the following steps to connect the power supply to the USB-1616FS:
1.

Connect the external power cord to the POWER IN connector on the rear of the USB-1616FS enclosure.
This connector is labeled IN on the board.

2.

Plug the power supply into a power outlet.

The PWR LED is on (green) when +9 V power is supplied to the USB-1616FS. If the voltage supply is less than
+6.0 V or more than +12.5 V, the PWR LED is off.
Do not connect external power to the POWER OUT connector
The power connector labeled POWER OUT on the enclosure (OUT on the board) provides power to an
additional MCC USB Series product. If you connect the external power supply to the POWER OUT connector,
the USB-1616FS does not receive power, and the PWR LED does not turn on.

Connecting the USB-1616FS
To connect the USB-1616FS to your system, do the following.
1.

Connect the USB cable that was shipped with the device to the USB connector labeled USB IN on theUSB-1616FS.
The USB cable supplied with the USB-1616FS has a higher gauge wire than generic USB cables, and isrequired for proper enumeration of the USB-1616FS.

2.

Connect the other end of the USB cable to a USB port on your computer or to an external USB hub that isconnected to your computer. The PWR LED turns on (green). The USB cable provides power andcommunication to the USB-1616FS.

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USB-1616FS User's Guide

Installing the USB-1616FS

The USB-1616FS installs as a composite device with separate devices attached. When you connect the device
for the first time, a Found New Hardware dialog opens as each device interface is detected. This is normal.
After the device is installed its LED will blink and then remain on. This indicates that communication isestablished between the USB-1616FS and your computer.
If you are running Windows XP and connect the device to a USB 1.1 port, a balloon displays the message"Your USB device can perform faster if you connect to a USB 2.0 port." You can ignore this message. The
USB-1616FS functions properly when connected to a USB 1.1 port, although USB bandwidth is limited.
If the USB LED turns off
If communication is lost between the device and the computer, the USB LED turns off. Disconnect the USB
cable from the computer and then reconnect it. This should restore communication, and the USB LED should
turn on.
If your system does not detect the USB-1616FS
If a "USB device not recognized" message appears when you connect the USB-1616FS, do the following.
1.

Unplug the USB cable from the USB-1616FS.

2.

Unplug the external power cord from the POWER IN connector on the enclosure.

3.

Plug the external power cord back into the POWER IN connector.

4.

Plug the USB cable back into the USB-1616FS.

Your system should now properly detect the USB-1616FS hardware. Contact technical support if your systemstill does not detect the USB-1616FS.

9

Chapter 3

Functional Details
Analog input acquisition modes

The USB-1616FS can acquire analog input data in three basic modes – software paced, continuous scan, andburst scan.

Software paced
With software paced mode you acquire one analog sample at a time. You initiate the A/D conversion by callinga software command. The analog value is converted to digital data and returned to the computer. Repeat thisprocedure until you have the total number of samples that you want from one channel.
The maximum throughput sample rate in software paced mode is about 250 S/s, but may vary depending on
your system. You may receive OVERRUN errors at higher rates on some platforms. Using the burst scan mode
(BURSTIO) should resolve these problems.

Hardware paced
With hardware paced mode you acquire data from up to 16 channels simultaneously. The analog data is
continuously acquired, converted to digital values, and written to the device on-board FIFO buffer until you
stop the scan. The FIFO buffer is serviced in blocks as the data is transferred from the device FIFO buffer to thememory buffer on your computer.
You can acquire data with the USB-1616FS from one channel at 50 kS/s and up to 16 channels at 9.5 kS/s each.
Throughput rates for up to 16 channels are listed in the Specifications section on page 21. You can start acontinuous scan with either a software command or with an external hardware trigger event.

Burst scanWith burst scan mode (BURSTIO), you can acquire data using the full capacity of its 32 k sample FIFO on thedevice. The acquired data is then read from the FIFO and transferred to a user memory buffer on the computer.
You can initiate a single acquisition sequence for any number of input channels by either a software commandor an external hardware trigger.
Burst scans are limited to the depth of the on-board memory, as the data is acquired at a rate faster than it can betransferred to the computer. The maximum sampling rate is an aggregate rate, where the total acquisition rate
for all channels is 200 kS/s divided by the number of channels. The maximum rate for each channel is 50 kS/s.
The maximum rate that you can acquire data using burst scan mode is 50 kS/s per channel for one, two, or fourchannels, and 12.5 kS/s per channel for 16 channels.

10USB-1616FS User's Guide

Functional Details

Board components
Major components on the USB-1616FS are shown in Figure 2.






Two (2) USB connectors
Two (2) external power connectors
USB LEDPWR LED
Four (4) Screw terminal banks

Figure 2. USB-1616FS internal components

USB OUT connector
The USB OUT connector is a downstream hub output port intended for use with other MCC USB Series
products only. The USB hub is self-powered, and can provide 100 mA maximum current at 5 V. The USB out
connector is labeled USB OUT on the enclosure and on the board.
For information on daisy chaining to other MCC USB Series products, refer to Daisy chaining additional
devices to the USB-1616FS on page 15.

USB IN connector
Connect the USB IN connector to the USB port on your computer (or USB hub connected to your computer).
The USB in connector is labeled USB IN on the enclosure and on the board.

External power connectors
The USB-1616FS has two external power connectors labeled POWER IN and POWER OUT on the enclosure.
The POWER IN connector is labeled IN on the board, and the POWER OUT connector is labeled OUT on theboard.
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USB-1616FS User's Guide

Functional Details

To supply external power, connect the POWER IN connector to the supplied +9 V external power supply(CB-PWR-9V3A).
The POWER OUT connector lets you power additional daisy chained MCC USB Series devices from a single
external power supply. A user-supplied custom cable is required to daisy chain multiple devices.

USB LED
The USB LED indicates the communication status of the USB-1616FS. This LED uses up to 5 mA of current
and cannot be disabled. The table below explains the behavior of the USB LED.
USB LED Illumination
USB LED

Indication

Steady green
Blinks continuously

The USB-1616FS is connected to a computer or external USB hub.
Initial communication is established between the USB-1616FS and the computer, or data is
being transferred.

PWR LEDAn on-board voltage supervisory circuit monitors the USB VBUS (5V) and the external 9 V power supply. If
the input voltage falls outside of the specified ranges the PWR LED shuts off; refer to the following table.
PWR LED IlluminationPWR LED state

Indication

On - steady green
Off

USB +5 V power or +9 V external power is supplied to the device.
Input power is not supplied, or a power fault has occurred. A power fault occurs when
the input power falls outside of the specified voltage range:
 USB VBUS (+5 V):
4.75 V to 5.25 V
 External power: (+9 V):
6.0 V to 12.5 V

Screw terminals
The device has two rows of screw terminals. Each row has 26 connections. Signal labels are shown in Figure 3.

Figure 3. USB-1616FS screw terminals

The screw terminals provide the following connections:









eight digital I/O terminals (DIO 0 to DIO 7)
one external digital trigger terminal (TRIG IN)
one power terminal (5V)eight ground terminals (GND 0 to 7)
one external event counter terminal (CTR)
one terminal for external clocking and multi-unit synchronization (SYNC)
16 analog input terminals (CHANNEL IN 0 to 15)
16 analog ground terminals (AGND 0 to 15)

Use 14 AWG to 30 AWG wire for your signal connections.
Caution! Keep the length of stripped wire at a minimum to avoid a short to the enclosure! When connecting
your field wiring to the screw terminals, use the strip gage on the terminal strip, or strip to 5.5 mm
to 7.0 mm (0.215 in. to 0.275in.) long.

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Functional Details

Each screw terminal is identified with a label on the board and on the underside of the enclosure lid. Refer tothe table below for the signal name associated with each board label.
Board labels and associated signal names
Board label

DIO

0
1
2
3
4
5
6
7

TRIG IN
5V

CHANNEL IN

0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

Signal name
DIO 0
DIO 1
DIO 2
DIO 3
DIO 4
DIO 5
DIO 6
DIO 7
TRIG IN
5V
CH 0
CH 1
CH 2
CH 3
CH 3
CH 4
CH 5
CH 6
CH 8
CH 9
CH 10
CH 11
CH 12
CH 13
CH 14
CH 15

Board label
0
1
2
3
GND
4
5
6
7
CTR
SYNC
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

AGND

Signal name
GND 0
GND 1
GND 2
GND 3
GND 4
GND 5
GND 6
GND 7
CTR
SYNC
AGND 0
AGND 1
AGND 2
AGND 3
AGND 4
AGND 5
AGND 6
AGND 7
AGND 8
AGND 9AGND 10
AGND 11
AGND 12
AGND 13
AGND 14
AGND 15Signal connections
Analog inputs
You can connect up to 16 analog input connections (CH0 IN through CH15 IN) to the screw terminals labeled
Channel IN 0-15. We recommend that you connect unused analog input terminals to ground terminals during
operation. For example, if you are not using CH7 IN, connect this terminal to AGND 7.
The analog input channels are configured for single-ended input mode. Each analog signal is referenced tosignal ground (AGND), and requires two wires:

Connect the wire carrying the signal to be measured to CH# IN.
Connect the second wire to AGND.

The input voltage ranges are ±10 V, ±5 V, ±2.0 V, and ±1.0 V.
For more information about analog signal connections
For general information about single-ended inputs, refer to the Guide to DAQ Signal Connections (available on
our web site at www.mccdaq.com/support/DAQ-Signal-Connections.aspx).

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Channel-gain queue
The channel-gain queue feature allows you to configure a different gain setting for each channel. The gain
settings are stored in a channel-gain queue list that is written to local memory on the device.
The channel-gain queue list can contain up to 16 unique elements. The channel list must be in increasing order.
An example of an 8-element list is shown in the following table.
Sample channel-gain queue list
Element

Channel

Range

0
1
2
3
4
5
6
7

CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7

BIP10V
BIP5V
BIP10V
BIP1V
BIP2V
BIP10V
BIP1V
BIP5V

Carefully match the gain to the expected voltage range on the associated channel or an over range condition
may occur. Although this condition does not damage the device, it does produce a useless full-scale reading,and can introduce a long recovery time due to saturation of the input channel.

Digital I/O
You can connect up to eight digital I/O lines to the screw terminals labeled DIO 0 to DIO 7. Each digital channel
is individually configurable for input or output.
The digital I/O terminals can detect the state of any TTL-level input. Refer to the schematic shown in Figure 4.

Figure 4. Schematic showing switch detection by digital channel DIO0

If you set the switch to the +5 V input, DIO 0 reads TRUE (1). When set to GND, DIO 0 reads FALSE (0).
Pull-up/down configuration
All digital I/O lines are pulled up by default to USB +5V with a 47 kΩ resistor. To configure for pull-down, theboard must be modified at the factory.
For more information on digital signal connections
For general information about digital signal connections and digital I/O techniques, refer to the Guide to DAQ
Signal Connections (available on our web site at www.mccdaq.com/support/DAQ-Signal-Connections.aspx).

Counter input
The CTR terminal (CTR) is a TTL level input to a 32-bit event counter. The internal counter increments when
the TTL level transitions from low to high. The counter can count frequencies of up to 1 MHz.

Trigger input
The trigger terminal (TRIG IN) is an external digital trigger input. You can configure this terminal with softwarefor either rising (default) or falling edge.

14USB-1616FS User's Guide

Functional Details

SYNC I/O
The SYNC terminal is a bidirectional I/O signal that can be configured as an input or an output:Configure as an external clock input to externally clock the A/D conversions. The SYNC terminal supports
TTL-level input signals.
Configure as an output to synchronize with a second USB-1616FS and acquire data from 32 channels. For
more information about synchronized operations, refer to page 18.

Power output
The +5V terminal (labeled 5V) draws power from either the USB connector VBUS terminal or the external
power supply.
Caution! The +5V terminal is an output. Do not connect to an external power supply or you may damage
the USB-1616FS and possibly the computer.
The maximum amount of +5 V current from the +5 V terminal is limited to 50 mA.

Ground terminals
The analog ground (AGND) terminals provide a common ground for all analog channels.
The digital ground (GND) terminals provide a common ground for the digital, trigger, counter, sync and power
terminals.

Daisy chaining additional devices
Daisy chained MCC USB Series products connect to the USB bus through the high-speed hub on the USB1616FS. You can daisy chain up to four MCC USB Series products to a single USB 2.0 port on your computer,or up to two devices to a single USB 1.1 port. MCC USB Series products are USB 2.0 full-speed devices thatprovide a signaling bit rate of 12 Mb/s. The throughput rate is shared by all devices connected to the USB bus.
Complete the following steps to daisy-chain two or more USB-1616FS devices. A user-supplied custom cable isrequired to daisy chain multiple devices.
The device connected to the computer is referred to as the connected device.
Each additional device that you want to daisy chain to the host USB-ERB08 is referred to as a new device.

This procedure assumes you already have one USB-1616FS connected to a computer and to the external powersource.
1.

Connect the Power OUT connector on the connected device to the POWER IN connector on the newdevice.

2.

Connect the USB OUT connector on the connected device to the USB IN connector on the new device.

3.

For each additional device you want to add, repeat steps 1-2, with the device you just daisy chained now
being the connected device.

Sample rate limitations
The maximum sample rate when using multiple USB-1616FS boards is system-dependent. Multiple board
performance is limited by an overall aggregate sample rate. The maximum throughput is in number of samples
taken per second. The rate is irrespective of the number of channels sampled or the number of boards installed.
The maximum sample rate of any one channel is limited to 50 KS/s.
The typical limiting factor for throughput is CPU usage. At maximum system throughput, virtually all available
CPU power is consumed by the USB data transfer. When you run your system close to its maximum
throughput, the amount of CPU power that is available for running other concurrent processes is limited.
Benchmark performance rates are listed in the Specifications chapter on page 20.

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USB-1616FS User's Guide

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Power limitations
When daisy chaining additional MCC USB Series products to the USB-1616FS, you must ensure that you
provide adequate power to each board that you connect. The USB-1616FS is powered with a 9 VDC nominal,
3.0 A external power supply.
Voltage drop
A drop in voltage occurs with each board connected in a daisy chain system. The voltage drop between the
power supply input and the daisy chain output is 0.5 V maximum. Factor in this voltage drop when you
configure a daisy chain system to ensure that at least 6.0 VDC is provided to the last board in the chain.

Accuracy
The overall accuracy of any instrument is limited by the error components within the system. Quite often,
resolution is incorrectly used to quantify the performance of a measurement product. While "16-bits" or "1 partin 65,536" does indicate what can be resolved, it provides little insight into the quality, or accuracy, of an
absolute measurement. Accuracy specifications describe the actual measurement that can be relied upon with aUSB-1616FS.
There are three types of errors which affect the accuracy of a measurement system:ooooffsetgain
nonlinearity

The primary error sources in the USB-1616FS are offset and gain. Nonlinearity is small in the USB-1616FS,
and is not significant as an error source with respect to offset and gain.
Figure 5 shows an ideal, error-free, USB-1616FS transfer function. The typical calibrated accuracy of the USB1616FS is range-dependent, as explained in the "Usage note" in the Specifications chapter. We use a ±10V
range as an example of what you can expect when performing a measurement in this range.
The accuracy plot in Figure 5 is drawn for clarity and is not drawn to scale.

Figure 5. Ideal USB-1616FS transfer function

The USB-1616FS offset error is measured at mid-scale. Ideally, a zero volt input should produce an output codeof 32,768. Any deviation from this is an offset error. Figure 6 shows the USB-1616FS transfer function with anoffset error. The typical offset error specification for the USB-1616FS on the ±10 V range is ±1.66 mV. Offset
error affects all codes equally by shifting the entire transfer function up or down along the input voltage axis.
16USB-1616FS User's Guide

Functional Details

The accuracy plots in Figure 6 are drawn for clarity and are not drawn to scale.

Figure 6. USB-1616FS transfer function with offset error

Gain error is a change in the slope of the transfer function from the ideal, and is typically expressed as apercentage of full-scale. Figure 7 shows the USB-1616FS transfer function with gain error. Gain error is easily
converted to voltage by multiplying the full-scale input (±10 V) by the error.
The accuracy plots in Figure 7 are drawn for clarity and are not drawn to scale.

Figure 7. USB-1616FS transfer function with gain error

For example, the USB-1616FS exhibits a typical calibrated gain error of ±0.04% on all ranges. For the ±10 V
range, this would yield 10 V × ±0.0004 = ±4 mV. This means that at full scale, neglecting the effect of offset forthe moment, the measurement would be within 4 mV of the actual value. Note that gain error is expressed as aratio. Values near ±FS (±10 V) are more affected from an absolute voltage standpoint than are values near
mid-scale, which see little or no voltage error.

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USB-1616FS User's Guide

Functional Details

Combining these two error sources in Figure 8, we have a plot of the error band of the USB-1616FS at ±full
scale (±10 V). This plot is a graphical version of the typical accuracy specification of the product.
The accuracy plots in Figure 8 are drawn for clarity and are not drawn to scale.

Figure 8. USB-1616FS error band plot

Synchronized operations
You can connect up to four USB-1616FS devices to one USB 2.0 port. You can connect up to two devices to a
USB 1.1 port.
You can connect the SYNC pin of two USB-1616FS units together in a master/slave configuration and acquire
data synchronously from 32 channels. When the SYNC pin is configured as an output, the internal A/D pacer
clock signal is present at the screw terminal. You can output the A/D pacer clock to the SYNC pin of a second
USB-1616FS configured for A/D pacer input.
Change to SYNC pin setting not implemented until first scan
When you change the setting of the SYNC pin to input or to output using InstaCal, the change does not takeplace until you run a scan with the USB-1616FS.
Consequently, if you change the SYNC pin from output to input, the SYNC pin remains an output, andconnections to this pin are connections to an output, until the first scan runs. This will not damage the USB1616FS.
To update the SYNC pin setting before connecting the SYNC pin, run the InstaCal analog Scan Test.

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Functional Details

Mechanical drawings

Figure 9. USB-1616FS circuit board dimensions

Figure 10. USB-1616FS enclosure dimensions

19

Chapter 4

Specifications
All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.

Analog input
Table 1. Analog input specifications
Parameter

Conditions

Specification

A/D converters
Number of channels

16-bit, SAR type16 single-ended

Input configuration
Sampling method
Absolute maximum input
voltage
Input impedance
Input bandwidth (–3 dB)
Input leakage current
Input capacitance
Offset temperature drift

Individual A/D per channel
Simultaneous±15 V max

CHx IN to GND

100 MΩ, min
50 kHz typ±1 µA typ50 pf typ15 ppm/°C typ

Gain temperature drift
Input ranges
Sampling rate

All ranges
Software selectable
Scan to PC memory

35 ppm/°C typ±10 V, ±5 V, ±2 V, ±1 V
0.6 S/s to 50 kS/s, software programmableThroughput

Burst scan to 32 k sample FIFO
Software paced

20 S/s to 50 kS/s, software programmable
30 S/s to 500 S/s all channels; system dependent

Scan to PC memory

Refer to the Single Board Throughput andMultiple Board Throughput sections that follow
this table.
= (200 kS/s) / (# of channels), max of 50 kS/s forany channel
Software configurable. Queue list may contain up
to sixteen elements of unique, consecutive
channels paired with any valid range.
16 bits
15 bits

Burst scan to 32 k sample FIFO
Gain queue
Resolution
No missing codes
CrosstalkCalibration voltages

DC – 25 kHz (sine)–80 dB min
0 V, ±0.625 V, ±1.25 V, ±2.5 V, ±5.0 V, software
selectable±0.5% typ, ±1.0% max

Calibration voltage accuracy(Note 1)
Temperature sensor range
Temperature sensor accuracy
Trigger source
Note 1:0 °C to +70 °C max±3 °C typExternal digital: TRIG_IN

Software selectable

Actual values used for calibration are measured and stored in EEPROM.

20

USB-1616FS User's Guide

Specifications

Single board throughput
The USB-1616FS has an integral USB hub, allowing up to four USB-1616FS devices to be daisy chained andconnected to a single USB port on the host computer. We recommend using a 2.0 or higher USB adapter when
daisy chaining devices. The data shown in Table 2 reflects typical throughput for a single board system.
Table 2. Single board throughput: Scan to PC memory specifications
Number of Input Channels

Per-channel Throughput (kS/s)(Note 2)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

50000
50000
36000
30000
25000
22000
19000
17000
15000
14000
12500
12000
11250
10500
10000
9500

Note 2:The throughput rates apply to a single board system. Actual rates are system-dependent and may vary.

Multiple board throughput
The USB-1616FS has an integral USB hub, which allows up to four USB-1616FS devices to be daisy chained
and connected to a single USB 2.0 or greater port on the host computer. Revision F and later are compatible
with USB 3.0 (see Note 3). Older revisions can be daisy chained from a Revision F device attached to a USB
3.0 adapter.
The transfer of USB-1616FS data over the USB bus is CPU intensive. The transfer rate using multiple
USB-1616FS devices is both CPU intensive and system dependent. Multiple board performance is limited by an
overall aggregate sample rate. The maximum throughput is the number of samples per second, regardless of thenumber of channels sampled or number of devices installed. The maximum sample rate of any one channel islimited to 50 kS/s.
For example, if the maximum throughput in a system is 150,000 samples per second, you may sample
20 channels at 7.5 kS/s, 30 channels at 5 kS/s, 40 channels at 3.75 kS/s, and so on.
Note 3:The board revision may be determined from the part number label on the board that states "193337X-01L",
where X is the board revision.
Table 3. Calibrated absolute accuracy specifications

Range (V)

Accuracy (mV)

±10
±5
±2
±1

±5.66
±2.98
±1.31
±0.68

21

USB-1616FS User's Guide

Specifications

Table 4. Accuracy components specifications – all values are (±)
Range (V)% of Reading

Gain Error at FS (mV)

Offset (mV)

±10
±5
±2
±1

0.04
0.04
0.04
0.04

4.00
2.00
0.80
0.40

1.66
0.98
0.51
0.28

Table 5. Noise performance specifications
Range (V)

Typical Counts

LSBrms

±10
±5
±2
±1

10
10
11
14

1.52
1.52
1.67
2.12

Noise distribution is determined by gathering 50 k samples with analog inputs tied to ground (AGND) at theuser connector. Samples are gathered at the maximum specified sampling rate of 50 kS/s.

Digital input/output
Table 6. Digital I/O specifications
Parameter

Specification

Digital type
Number of I/O
Configuration
Digital I/O transfer rate (software paced)

CMOS
8 (DIO0 through DIO7)
Independently configured for input or output
System dependent, 33 port reads to 1000 port reads/writes or single bit
reads/writes per second, typ
2.0 V min, 5.5 V absolute max
0.8 V max, –0.5 V absolute min
3.8 V min
0.7 V max
Input

Input high voltage
Input low voltage
Output high voltage (IOH = –2.5 mA)
Output low voltage (IOL = 2.5 mA)
Power on and reset state

Earlier than Revision F (Note 3 on page 21)
Pull up/down configuration

All pins pulled up to USB VBUS via 47 kΩ resistors (default).
Positions are available for pull-down to ground (GND).
Hardware selectable via 0 Ω resistors is available as a factory option.

Revisions F and later (Note 3 on page 21)
Pull up/pull-down configuration

All pins are configurable via jumper W1 to 5 V or ground via 47 kΩ resistors

22

USB-1616FS User's Guide

Specifications

External trigger
Table 7. External trigger specifications
Parameter

Conditions

Specification

Trigger source

External digital

TRIG_IN

Trigger mode

Softwareselectable

Edge sensitive: user configurable for CMOS compatible rising(default) or falling edge
10 µs max
1 µs minTrigger latency
Trigger pulse width
Earlier than Revision F (Note 3 on page 21)
Input type
Input high voltage
Input low voltage
Input leakage current

Schmitt trigger, 1.5 kΩ series resistor
4.0 V min, 5.5 V absolute max
1.0 V max, –0.5 V min±1.0µA

Revisions F and later (Note 3 on page 21)
Input type
Schmitt trigger hysteresis

Schmitt trigger, 47 kΩ pull-down to ground and 1.5 kΩ series resistor
0.6 V min
1.5 V max
3.1 V max
1.0 V min

Input high voltage threshold
Input low voltage threshold

External clock input/output
Table 8. External clock I/O specifications
Parameter
Pin name
Pin type
Software selectable direction

Input clock rate
Clock pulse width

Conditions

Output
Input

Input
OutputSpecification
SYNC
Bidirectional
Outputs the internal A/D pacer clock
Receives the A/D pacer clock from an external source; rising edge
sensitive
50 kHz, max
1 µs min
5 µs min

Earlier than Revision F (Note 3 on page 21)
Input type
Input / output resistance
Input leakage current
Input high voltage
Input low voltage
Output high voltage
Output low voltage

IOH = –2.5 mA
No load
IOL = 2.5 mA
No loadSchmitt trigger with 200 Ω series resistor
200 Ω series resistor±1.0 µA
4.0 V min, 5.5 V absolute max
1.0 V max, –0.5 V absolute min
3.3 V min
3.8 V min
1.1 V max
0.6 V max23

USB-1616FS User's Guide

Specifications

Revisions F and later (Note 3 on page 21)
Input type
Input / output resistanceSchmitt trigger hysteresis
Input high voltage threshold
Input low voltage threshold
Output high voltage
Output low voltage

IOH = –8 mA
No load
IOH = 8 mA
No loadSchmitt trigger
200 Ω series resistor on output driver
1.5 kΩ series resistor on input buffer
47 kΩ pull-down resistor to ground
0.6 V min
1.5 V max
3.1 V max
1.0 V min
3.8 V min
4.4 V min
0.44 V max
0.1 V max

CounterTable 9. Counter specifications
Parameter

Specification

Pin name
Counter type
Number of channels
Resolution
Maximum input frequency
High pulse width
Low pulse width
Counter/timer read/write
rates; software paced

CTR
Event counter1
32 bits
1 MHz
500 ns min
500 ns min
Counter read: system dependent, 33 reads to 1,000 reads per second
Counter clear: system dependent, 33 reads to 1,000 writes per second
0 V recommended min–0.5 V absolute min
5.0 V recommended max
5.5 V absolute max

Input low voltage limit
Input high voltage limit

Earlier than Revision F (Note 3 on page 21)
Input type
Schmitt trigger hysteresis
Input leakage current
Input low voltage threshold
Input high voltage threshold

Schmitt trigger, rising edge triggered, 1.5 kΩ series resistor
20 mV to 100 mV± 1 µA
1.0 V min
4.0 V max

Revisions F and later (Note 3 on page 21)
Input type
Schmitt trigger hysteresis
Input high voltage threshold
Input low voltage threshold

Schmitt trigger, rising edge triggered, 1.5 kΩ series resistor, 47 kΩ pull-down to ground
0.6 V min
1.5 V max
3.1 V max
1.0 V min24

USB-1616FS User's Guide

Specifications

MemoryTable 10. Memory specifications
Parameter

Specification

Data FIFOEEPROM
EEPROM configuration

32,768 samples, 65,536 bytes
1,024 bytes
Address range

AccessDescription

0x000-0x07F
0x080-0x1FF
0x200-0x3FF

Reserved
Read/Write
Read/Write

128 bytes system data
384 bytes calibration data
512 bytes user area

Indicator LEDs
Table 11. Indicator LED specifications
Parameter

Specification

Power LED (top)On when the device microcontroller has power and is configured.
Both LEDs blink together in firmware update mode on hardware revisions F and later (seeNote 3 on page 21)
Blinks to indicate USB communications.

Status LED

Power
Table 12. Power specifications
Parameter

Conditions

Specification

Supply current (Note 4)User +5V output voltage
range (Note 5)User +5V output current(Note 6)

Continuous mode
Available at the 5V screw terminal

350 mA typ
4.0 V min, 5.25 V max

Available at the 5V screw terminal

50 mA max

Note 4:Note 5:Note 6:

The total current requirement for the device which includes up to 10 mA for the status LEDs.
Output voltage range assumes input power supply voltage is within specified limits
The total amount of current that can be sourced from the 5V screw terminal for general use. This specification
includes any additional contribution due to DIO loading.

USB +5V voltage
Table 13. USB voltage specifications
Parameter

Specification

USB +5V (VBUS) input
voltage range

4.75 V min to 5.25 V max

25

USB-1616FS User's Guide

Specifications

External power input
Table 14. External power input specifications
Parameter

Conditions

Specification

6.0 V > Vext or Vext > 12.5 V
6.0 V < Vext < 12.5 V
MCC p/n CB-PWR-9V3A+6.0 VDC to 12.5 VDC
9 VDC power supply included
PWR LED = Off (power fault)
PWR LED = On
+9 V ±10%, @ 3 A

External power input
Voltage supervisor limits – PWR LED(Note 7)External power adapter (included)Note 7:

A voltage supervisory circuit monitors the external +9 V power supply voltage. If this power supply exceeds its
specified limit, the PWR LED will turn off indicating a power fault condition.

External power output
Table 15. External power output specifications
Parameter

Conditions

External power output – current range(Note 8)External power output
Note 8:Specification
4.0 A max

Voltage drop between power input anddaisy chain power output

0.5 V max

The daisy chain power output option allows multiple MCC USB products to be powered from a single external
power source in a daisy chain fashion. The voltage drop between the device power supply input and the daisy
chain output is 0.5 V max. Users must plan for this drop to ensure that the last device in the chain will receive atleast 6.0 VDC. A user-supplied custom cable is required to daisy chain multiple devices.

USB specifications
Table 16. USB specifications
Parameter

Specification

USB "B" connector
USB device type
Device compatibility
USB "A" connector
USB hub type

Input
USB 2.0 (full-speed)
USB 1.1, USB 2.0, USB 3.0
Downstream hub output port
Supports USB 2.0 high-speed, full-speed, and low-speed operating points
Self-powered, 100 mA max downstream VBUS capability
MCC USB Series devices
A-B cable, UL type AWM 2527 or equivalent (min 24 AWG VBUS/GND,
min 28 AWG D+/D–)
3 meters, max (9.84 feet)

Compatible products
USB cable type (upstream anddownstream)
USB cable length

Environmental
Table 17. Environmental specifications
Parameter

Specification

Operating temperature range
Storage temperature range
Humidity

0 ° C to 70 ° C–40 ° C to 85 ° C
0% to 90% non-condensing

26

USB-1616FS User's Guide

Specifications

Mechanical
Table 18. Mechanical specifications
Parameter

Specification

Card dimensions (L × W × H)
Enclosure dimensions (L × W × H)

203.2 × 121.9 × 20.0 mm (8.0 × 4.8 × 0.8 in.)
241.3 × 125.7 × 58.9 mm (9.50 × 4.95 × 2.32 in.)Screw terminals
Table 19. Screw terminal specifications
Parameter

Specification

Connector type
Wire gauge range

Screw terminal
14 AWG to 30 AWG
Table 20. Screw terminal pinout

Board label
DIO

0
1
2
3
4
5
6
7

TRIG IN
5V
CHANNEL IN

0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

Signal name
DIO 0
DIO 1
DIO 2
DIO 3
DIO 4
DIO 5
DIO 6
DIO 7
TRIG IN
5V

Board label
GND
0
1
2
3
4
5
6
7
CTR
SYNC

Signal name
GND 0
GND 1
GND 2
GND 3
GND 4
GND 5
GND 6
GND 7
CTR
SYNC

CH 0
CH 1
CH 2
CH 3
CH 3
CH 4
CH 5
CH 6
CH 8
CH 9
CH 10
CH 11
CH 12
CH 13
CH 14
CH 15

AGND

AGND 0
AGND 1
AGND 2
AGND 3
AGND 4
AGND 5
AGND 6
AGND 7
AGND 8
AGND 9AGND 10
AGND 11
AGND 12
AGND 13
AGND 14
AGND 15

27

0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

EU Declaration of Conformity
According to ISO/IEC 17050-1:2010
Manufacturer:
Address:

Product Category:
Date and Place of Issue:
Test Report Number:

Measurement Computing Corporation
10 Commerce Way
Norton, MA 02766
USAElectrical equipment for measurement, control and laboratory use.
November 14, 2016, Norton, Massachusetts USA
EMI4133.05 and Addendum

Measurement Computing Corporation declares under sole responsibility that the productUSB-1616FS, Board Revision F* or later
is in conformity with the relevant Union Harmonization Legislation and complies with the essential
requirements of the following applicable European Directives:
Electromagnetic Compatibility (EMC) Directive 2014/30/EU
Low Voltage Directive 2014/35/EU
RoHS Directive 2011/65/EU
Conformity is assessed in accordance to the following standards:
EMC:
Emissions: EN 61326-1:2013 (IEC 61326-1:2012), Class A
 EN 55011: 2009 + A1:2010 (IEC CISPR 11:2009 + A1:2010), Group 1, Class A
Immunity: EN 61326-1:2013 (IEC 61326-1:2012), Controlled EM Environments EN 61000-4-2:2008 (IEC 61000-4-2:2008)
 EN 61000-4-3 :2010 (IEC61000-4-3:2010)
 EN 61000-4-4 :2012 (IEC61000-4-4:2012) EN 61000-4-5 :2005 (IEC61000-4-5:2005)
 EN 61000-4-6 :2013 (IEC61000-4-6:2013)
 EN 61000-4-11:2004 (IEC61000-4-11:2004)
Safety: EN 61010-1 (IEC 61010-1)
Environmental Affairs:
Articles manufactured on or after the Date of Issue of this Declaration of Conformity do not contain any of therestricted substances in concentrations/applications not permitted by the RoHS Directive.

Carl Haapaoja, Director of Quality Assurance*The board revision may be determined from the part number label on the board that states "193337X-01L", where X is theboard revision.

EU Declaration of Conformity, Legacy Hardware
Manufacturer:
Address:

Category:

Measurement Computing Corporation
10 Commerce Way
Norton, MA 02766
USAElectrical equipment for measurement, control and laboratory use.

Measurement Computing Corporation declares under sole responsibility that the productUSB-1616FS, Earlier than Revision F *to which this declaration relates is in conformity with the relevant provisions of the following standards or otherdocuments:
EU EMC Directive 89/336/EEC: Electromagnetic Compatibility, EN 61326 (1997) Amendment 1 (1998)
Emissions: Group 1, Class A
EN 55011 (1990)/CISPR 11: Radiated and Conducted emissions.

Immunity: EN61326, Annex A








IEC 1000-4-2 (1995): Electrostatic Discharge immunity, Criteria C.
IEC 1000-4-3 (1995): Radiated Electromagnetic Field immunity Criteria C.
IEC 1000-4-4 (1995): Electric Fast Transient Burst immunity Criteria A.
IEC 1000-4-5 (1995): Surge immunity Criteria C.
IEC 1000-4-6 (1996): Radio Frequency Common Mode immunity Criteria A.
IEC 1000-4-8 (1994): Magnetic Field immunity Criteria A.
IEC 1000-4-11 (1994): Voltage Dip and Interrupt immunity Criteria A.

Declaration of Conformity based on tests conducted by Chomerics Test Services, Woburn, MA 01801, USA in
February, 2005. Test records are outlined in Chomerics Test Report #EMI4133.05.
We hereby declare that the equipment specified conforms to the above Directives and Standards.

Carl Haapaoja, Director of Quality Assurance*The board revision may be determined from the part number label on the board that states "193337X-01L", where X is theboard revision.

Measurement Computing Corporation
10 Commerce Way
Norton, Massachusetts 02766(508) 946-5100
Fax: (508) 946-9500
E-mail: info@mccdaq.com
www.mccdaq.com

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Phone: +36 (52) 515400
Fax: +36 (52) 515414
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