USB-1608HS-2AO

16-Bit Multifunction DAQ with Simultaneous Sampling

User's Guide

April 2019. Rev 5© Measurement Computing Corporation

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NoticeMeasurement Computing Corporation does not authorize any Measurement Computing Corporation product for
use in life support systems and/or devices without prior written consent from Measurement Computing
Corporation. Life support devices/systems are devices or systems that, a) are intended for surgical implantation
into the body, or b) support or sustain life and whose failure to perform can be reasonably expected to result ininjury. Measurement Computing Corporation products are not designed with the components required, and are
not subject to the testing required to ensure a level of reliability suitable for the treatment and diagnosis ofpeople.

USB-1608HS-2AO

2

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-1608HS-2AO ...................................................................................................... 6
Functional block diagram ................................................................................................................................... 7
Chapter 2

Installing the USB-1608HS-2AO .......................................................................................................... 8
Unpacking........................................................................................................................................................... 8
Installing the software ........................................................................................................................................ 8
Installing the hardware ....................................................................................................................................... 8Connecting the AC power adapter .................................................................................................................................... 8Connecting the USB-1608HS-2AO to your system .......................................................................................................... 8

Calibrating the USB-1608HS-2AO .................................................................................................................... 8
Chapter 3

Functional Details ................................................................................................................................. 9
Theory of operation - analog input acquisition modes ....................................................................................... 9
Software paced mode ........................................................................................................................................................ 9Continuous scan mode ...................................................................................................................................................... 9External components .......................................................................................................................................... 9
Status LEDs ...................................................................................................................................................................... 9Screw terminals ................................................................................................................................................ 10
USB connector .................................................................................................................................................................10
Power connector ..............................................................................................................................................................10Signal connections ............................................................................................................................................ 11

Analog input terminals (CH0_L - CH7_H)......................................................................................................................11
Analog voltage output terminals (VDAC0_F, VDAC0_S, VDAC1_F, and VDAC1_S).................................................12
Analog ground terminals..................................................................................................................................................13
Digital input terminals (DI0 to DI7) and digital output terminals (DO0 to DO7) ............................................................13
Power output (+5V EXT).................................................................................................................................................14
Counter terminal (CTR) ...................................................................................................................................................14
SYNC terminals (SYNC_IN and SYNC_OUT) ..............................................................................................................14
Trigger terminal (TRIG_IN) ............................................................................................................................................15
Common ground terminals (GND) ..................................................................................................................................18

Chapter 4

Specifications ...................................................................................................................................... 19
Analog input ..................................................................................................................................................... 19
Analog output ................................................................................................................................................... 21
Analog input calibration ................................................................................................................................... 22
Digital input/output........................................................................................................................................... 22External trigger ................................................................................................................................................. 22External clock input/output............................................................................................................................... 23
Counter ............................................................................................................................................................. 23
Memory ............................................................................................................................................................ 23
Microcontroller ................................................................................................................................................. 24
Power ................................................................................................................................................................ 24
External power input ........................................................................................................................................ 24
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USB-1608HS-2AO User's Guide

USB specifications ........................................................................................................................................... 24
Environmental .................................................................................................................................................. 24
Mechanical ....................................................................................................................................................... 24
Signal connector ............................................................................................................................................... 25
Screw terminal pinout ....................................................................................................................................... 25
Declaration of Conformity .................................................................................................................. 27

4

Preface

About this User's Guide
What you will learn from this user's guideThis user's guide describes the Measurement Computing USB-1608HS-2AO data acquisition device and lists
device specifications.

Conventions in this user's guide
For more information
Text presented in a box signifies additional information and helpful hints related to the subject matter you arereading.
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 checkboxes.

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 the USB-1608HS-2AO is available on our website at www.mccdaq.com. You canalso contact Measurement Computing Corporation by phone, fax, or email 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Chapter 1

Introducing the USB-1608HS-2AO
This user's guide contains all of the information you need to connect the USB-1608HS-2AO to your computer
and to the signals you want to measure.
The USB-1608HS-2AO is a USB 2.0 high-speed device supported under popular Microsoft® Windows®
operating systems. The USB-1608HS-2AO is fully compatible with both USB 1.1 and USB 2.0 ports.
The USB-1608HS-2AO features the following:










With one A/D converter per channel, the USB-1608HS-2AO offers true simultaneous-sampling of up to
eight channels of 16-bit single-ended or differential analog input at 250 kHz per channel.
Each channel can be independently-configured with software for either single-ended or differential input.
The input range of each channel can also be configured independently with software.
Two independent 16-bit analog output channels can be configured with a remote sensing option tocompensate for voltage drop errors that may occur at the field device.
Eight digital input lines and eight digital output lines.
The digital output lines are driven low on power up and reset. Each digital line has an associated LED
indicator that lights for the logic 1 (high) state. You can disable all input or output LEDs with a jumper–one
jumper disables all input LEDs. A second jumper disables all output LEDs.
A 32-bit counter capable of counting TTL pulses.
A 5 V, 2 A, AC adapter (MCC p/n PS-5V2AEPS) powers the USB-1608HS-2AO. This adapter ships withthe device.
A synchronization input line (SYNC_IN) allows you to provide an external sampling clock for the analog
inputs. A synchronization output line (SYNC_OUT) lets you output the internal or external sampling clockof the USB-1608HS-2AO analog inputs.
An analog trigger lets you start analog input conversions based on the value of a digital or analog signal.

The USB-1608HS-2AO is shown in Figure 1. I/O connections are made to the screw terminals on the device.

Figure 1. USB-1608HS-2AO

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USB-1608HS-2AO User's Guide

Introducing the USB-1608HS-2AO

Functional block diagram
USB-1608HS-2AO functions are illustrated in the block diagram shown here.

Figure 2. USB-1608HS-2AO functional block diagram

7

Chapter 2

Installing the USB-1608HS-2AO
UnpackingAs with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the device 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.
Contact us immediately if any components are damaged.

Installing the software
Refer to the MCC DAQ Quick Start and the USB-1608HS-2AO product page on our website for information
about the software that supports the device.
Install the software before you install your device
The driver needed to run the USB-1608HS-2AO is installed with the software. Therefore, you need to install thesoftware package you plan to use before you install the hardware.

Installing the hardware
Connecting the AC power adapter
Power to the USB-1608HS-2AO is provided with the 5 V adapter (PS-5V2AEPS). Connect the power adapter
cord to the power connector on the USB-1608HS-2AO, and plug the AC adapter into a power outlet.
The power LED on the device turns on when the USB-1608HS-2AO is receiving power from the AC power
adapter.

Connecting the USB-1608HS-2AO to your system
To connect a USB-1608HS-2AO to your system, turn your computer on and connect the USB cable to anavailable USB port on the computer or to an external USB hub connected to the computer. Connect the otherend of the USB cable to the USB connector on the device.
When you connect the device for the first time, a Found New Hardware dialog opens when the operating
system detects the device. The dialog closes after the device is installed. The activity LED (ACT) will blink andthen remain on, indicating the USB-1608HS-2AO is communicating with your computer.
If the ACT LED turns off
If the ACT (active) LED turns on but then turns off, the computer has lost communication with the USB1608HS-2AO. To restore communication, disconnect the USB cable from the computer, and then reconnect it.
This should restore communication, and the LED should turn on again.

Calibrating the USB-1608HS-2AO
The USB-1608HS-2AO is shipped fully-calibrated. Calibration coefficients are stored in EEPROM.
You can calibrate the analog inputs on the USB-1608HS-2AO with InstaCal. The normal calibration interval isonce per year. Calibrate the device whenever the ambient temperature changes by more than ±10 °C. Allow theUSB-1608HS-2AO to warm up for at least 30 minutes before starting the calibration.

8

Chapter 3

Functional Details
Theory of operation - analog input acquisition modes
The USB-1608HS-2AO can acquire analog input data in two basic modes – software paced and continuous
scan.

Software paced mode
You can acquire one analog sample at a time in software paced mode. You initiate the A/D conversion bycalling a software command. The analog value is converted to digital data and returned to the computer. You
can repeat this procedure until you have the total number of samples that you want.
The maximum throughput sample rate in software paced mode is system-dependent.

Continuous scan mode
You can acquire data from up to eight channels simultaneously in continuous scan mode. The analog data is
continuously acquired, converted to digital values, and written to an onboard FIFO buffer on the USB-1608HS2AO until you stop the scan. The FIFO buffer is serviced in blocks as the data is transferred from the USB1608HS-2AO FIFO buffer to the memory buffer on your computer.
The maximum sampling rate is 250 kS/s per channel for one-to-eight channels. You can start a continuous scanwith either a software command or with an external hardware trigger event.

External components
The USB-1608HS-2AO has the following external components, as shown in Figure 3.


Status LEDs – USB activity (ACT) and Power (PWR)
Screw terminals
USB connector
Power connector

Power LED

USB active LED

Screw terminal pins 1 to 54

Figure 3. USB-1608HS-2AO external components – front view

Status LEDs
USB active LED (ACT)The ACT LED indicates the communication status of the USB-1608HS-2AO. The table below defines thefunction of the ACT LED.
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USB-1608HS-2AO User's Guide

Functional Details

LED Illumination
LED Illumination

Indication

Steady green
Blinks continuously

The USB-1608HS-2AO is connected to a computer or external USB hub.
Data is being transferred.

Power LED (PWR)
The PWR LED turns on when the USB-1608HS-2AO is receiving +5 V of power from the AC power adapter.

Screw terminals
The USB-1608HS-2AO has one row of screw terminals that provide the following connections:











16 analog inputs (CH0_L to CH7_L and CH0_H to CH7_H) for eight analog input connections
10 analog ground terminals (AGND)
Eight digital inputs (DI0 to DI7)
Eight digital outputs (DO0 to D07)
Four analog outputs (VDAC0_F, VDAC0_S, VDAC1_F, VDAC1_S) for two DAC channels—only twoconnections (VDAC0_F and VDAC1_F) are needed if remote sensing is disabled
One external trigger input (TRIG_IN)
Two SYNC terminals for external clocking and multi-unit synchronization (SYNC_IN and SYNC_OUT)
One event counter input (CTR)
One power output (+5 V EXT)
Three digital ground terminals (GND)

The pinout is shown in Figure 4.

Figure 4. USB-1608HS-2AO screw terminal functions

USB connector
The USB connector is on the rear of the USB-1608HS-2AO. This connector provides communication..

Power connector
Connect the external power adapter (MCC part number PS-5V2AEPS) to the power connector on the rear of theUSB-1608HS-2AO.

Figure 5. USB-1608HS-2AO external components – rear view10

USB-1608HS-2AO User's Guide

Functional Details

Signal connections
Analog input terminals (CH0_L - CH7_H)
You can connect up to eight analog input connections to these screw terminal pins:









CH0_H and CH0_L
CH1_H and CH1_L
CH2_H and CH2_L
CH3_H and CH3_L
CH4_L and CH4_H
CH5_L and CH5_H
CH6_L and CH6_H
CH7_L and CH7_H

Refer to the Figure 4 on page 10 for the location of these pins.
Input configuration
Analog signals are referenced to analog ground (AGND). Single-ended mode requires two wires:

The wire carrying the signal to be measured connects to CHx_H.
The second wire connects to AGND.

Differential mode requires three wires:

The wire carrying the positive portion of the differential signal to be measured connects to CHx_H.
The wire carrying the negative portion of the differential signal to be measured connects to CHx_L.
The analog ground reference wire connects to AGND.

The input voltage ranges are ±10 V, ±5 V, ±2.0 V, ±1.0 V. The following image illustrates a typicalsingle-ended measurement connection.
The following image depicts a voltage source connected to a USB-1608HS-2AO configured for single-ended
mode.

Figure 6. Single-ended measurement connection

11USB-1608HS-2AO User's Guide

Functional Details

The following image depicts a Wheatstone bridge signal source connected to a USB-1608HS-2AO configured
for differential mode.

Figure 7. Differential measurement connection

Information on signal connections
For general information about signal connections, refer to the Guide to DAQ Signal Connections (available fordownload on our website at www.mccdaq.com/support/DAQ-Signal-Connections.aspx).

Analog voltage output terminals (VDAC0_F, VDAC0_S, VDAC1_F, andVDAC1_S)
You can connect up to two analog voltage outputs to screw terminal pins VDAC0_F and VDAC1_F.
You may also use the VDAC0_S and VDAC1_S when you enable the remote sensing option for the output
channel. Refer to the pinout diagram on page 10 for the location of these pins.
You can enable remote sensing for each analog output on the USB-1608HS-2AO with InstaCal.
The remote sensing feature compensates for the voltage drop error that occurs in applications where the USB1608HS-2AO's analog outputs are connected to its load through a long wire- or cable-type interconnect.
Wire- and cable-type interconnects have some amount of associated series resistance. To calculate the total
series resistance, multiply the overall length by the manufacturer's specified resistance per unit length (Ω). If theseries resistance becomes large enough, a voltage drop error occurs along the wire when supplying current to
the load resistance. The remote sensing feature compensates for the voltage drop error that occurs along thewire.
Connecting the USB-1608HS-2AO when using the remote sensing feature
To connect the USB-1608HS-2AO for remote sensing, connect two separate output wires—one from the
VDACn_F (force) output terminal, and one from the VDACn_S (sense) input terminal—to the high side or
positive input terminal of the field device (load). The "n" in the terminal name refers to the number of theanalog output terminal (0 or 1).
For best results, these two wires should have identical length and gauge. The use of a twisted pair is highly
recommended.
In this configuration, the sense wire detects the voltage at the end of the force wire, and compensates for the I*R
loss along the wire due to the wire resistance.
12USB-1608HS-2AO User's Guide

Functional Details

Rload should not exceed the specified 1000 Ω, and the Rseries should not exceed its specified limit of 75 Ω.
Vcompliance = ((Rload + Rseries) * AOUT)/Rload
RSeries
VDAC_Fn(Force)(75 Ω ( max)

VDAC_Sn(Sense)RLoad(1000 Ω (max)Connecting the USB-1608HS-2AO when not using the remote sensing feature
If you are not using the remote sensing feature, connect a single output wire or cable from the VDACn_F(force) output terminal(s) to the load, and leave the VDACn_S (sense) terminals unconnected.
The voltage output range for each channel is ±10 V. The current output is a maximum of ±10 mA per channel.

Analog ground terminals
The 10 analog ground (AGND) connections provide a common ground for all analog input channels, output
channels, and the analog trigger (TRIG_IN).
Refer to the pinout diagram on page 10 for the location of the AGND terminal pins.

Digital input terminals (DI0 to DI7) and digital output terminals (DO0 to DO7)
You can connect up to eight digital input lines to screw terminals DI0 through DI7.
You can connect up to eight digital output lines to screw terminals DO0 to DO7.
Refer to the pinout diagram on page 10 for the location of these pins.
The eight input pins have 47 k resistors that you can configure to either pull-up or pull-down, or disconnectedwith a jumper.
You can use the USB-1608HS-2AO digital I/O terminals to detect the state of any TTL-level input. Refer to theswitch circuit shown in Figure 8 and the schematic shown in Figure 9. If you set the switch to the +5V EXT
input, DI0 reads TRUE (1). If you move the switch to GND, DI0 reads FALSE (0).

13USB-1608HS-2AO User's Guide

Functional Details+5V EXT
DI0
GND

Figure 8. Digital connection DI0 detecting the state of a switch
DI0

GND

+5V EXT

Figure 9. Schematic showing switch detection by digital channel DI0

Each digital input and output pin has an associated LED status indicator. A high at the pin turns the LED on.
You can disable the LEDs with jumpers. There is a jumper for the input LEDs, and one for the output LEDs.
Information on signal connections
For general information about signal connections, refer to the Guide to DAQ Signal Connections (available fordownload on our website at www.mccdaq.com/support/DAQ-Signal-Connections.aspx).

Power output (+5V EXT)You can use the +5V EXT connection to supply power to external devices or circuitry. This terminal can output
up to 10 mA. Refer to the pinout diagram on page 10 for the location of this pin.
Caution! The +5V EXT terminal is an output. Do not connect to an external power supply or you may
damage the USB-1608HS-2AO and possibly the computer.

Counter terminal (CTR)
The CTR terminal is a TTL-level input to a 32-bit event counter. Refer to the pinout diagram on page 10 for thelocation of this pin. The internal counter increments when the TTL level transitions from low to high. The
counter can count frequencies of up to 1 MHz.

SYNC terminals (SYNC_IN and SYNC_OUT)
You can use the SYNC_IN connection to externally pace the A/D conversions. The SYNC_IN terminal
supports TTL-level input signals of up to 250 kHz.
Use the SYNC_OUT connection to output the clock used for A/D conversions.
One example of the use of these two pins would be to synchronize with a second USB-1608HS-2AO andacquire synchronized data from 16 channels. You can connect the SYNC_OUT pin of one USB-1608HS-2AO
to the SYNC_IN pin of another USB-1608HS-2AO to acquire data synchronously from 16 channels.

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USB-1608HS-2AO User's Guide

Functional Details

SYNC_IN pin

SYNC_OUT pin

Figure 10. Configuring for synchronous data acquisition

Trigger terminal (TRIG_IN)
The TRIG_IN connection is an external analog/digital trigger input.
With the analog trigger function, you can start and control acquisitions with an analog signal. The analog trigger
threshold is from -10 V to +10 V on the TRIG_IN pin. A 12-bit DAC sets the level for the threshold. The
threshold resolution in this mode is 4.88 mV.
The USB-1608HS-2AO has three trigger options that you must set.


Trigger above or trigger below
Level-sensitive or edge-sensitive
Retrigger on or retrigger off

Each trigger operation mode is explained next. In each case, a ±2 V triangle waveform is used as the TRIG_IN
input source. The high threshold is set to 1.0 V, and the low threshold signal is set to –1.0 V.
In the following analog trigger signal diagrams, the bold portion of the waveform indicates the data acquired forthe given analog trigger mode.

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USB-1608HS-2AO User's Guide

Functional Details

Trigger above, level-sensitive
The acquisition begins when the TRIG_IN signal is above the threshold level. If the TRIG_IN signal is above
the threshold at the start of the scan, the acquisition begins immediately

Figure 11. Trigger above, level-sensitive

Trigger below, level-sensitive
The acquisition begins when TRIG_IN receives a signal that is below the low threshold (-1.0 V). If the
TRIG_IN signal is below the threshold level at the start of the scan, the acquisition begins immediately.

Figure 12. Trigger below, level-sensitive16

USB-1608HS-2AO User's Guide

Functional Details

Trigger above, edge-sensitive
The acquisition begins the first time the TRIG_IN signal goes above the high threshold (1.0 V). The TRIG_IN
signal must transition from below to above the high threshold to begin the acquisition.

Figure 13. Trigger above, edge-sensitive

Trigger below, edge-sensitive
The acquisition begins when TRIG_IN signal first goes below the low threshold (-1.0 V). A transition fromabove to below the threshold is necessary to begin acquisition. The TRIG_IN signal must transition from above
to below the low threshold to begin the acquisition.

Figure 14. Trigger below, edge-sensitive

Retrigger
The acquisition uses the trigger settings for positive edge/negative edge and level-sensitive/edge-sensitive, but
automatically rearms the trigger after acquiring the specified number of samples.
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USB-1608HS-2AO User's Guide

Functional Details

Common ground terminals (GND)
Three ground (GND) connections provide a common ground for the DIx, DOx, CTR, SYNC_IN and
SYNC_OUT, and +5V EXT connections.
Refer to the pinout diagram on page 10 for the location of the GND terminals.

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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 converter type
Number of channels
Input configuration
Sampling method
Analog input modes

Power up and reset state
Single-ended

Differential
Absolute maximum input
voltage
Input impedance
Input bandwidth (-3 dB)
Input leakage current
Input capacitance
Input ranges
A/D pacing
A/D trigger source
A/D trigger modes
Maximum working voltage(signal + common mode)
Sampling rate
Throughput

Resolution
Differential non-linearity(Note 1)
CMRR (60 Hz)

CHx IN to GND
TRIG_IN to GND
CHx IN
All input ranges

Software-selectable per channel

16-bit successive approximation type
Eight differential
Eight single-ended
Individual A/D per channel
Simultaneous
CHx_H and CHx_L inputs are disconnected from theirscrew terminal pins and internally connected to GND(recommended configuration for unused inputs).
CHx_H inputs are connected directly to their screw
terminal pins.
CHx_L inputs are disconnected from their screw
terminal pins and internally connected to GND.
CHx_H and CHx_L inputs are connected directly totheir screw terminal pins.
±25 V max (power on)±15 V max (power off)
1 GΩ (power on)
1.5 kΩ (power off)
330 kHz±25 pA
50 pf±10 V, ±5 V, ±2 V, ±1 V
Onboard A/D clock, external source (SYNC_IN). See
Table 9 on page 23.
TRIG_IN input. See Table 8 on page 22.
External analog. See Table 8 on page 22.
FSR ±0.05% FSR max
0.009 S/s to 250 kS/s, software-programmable
33 to 8000 S/s all channels, system-dependent
250 kS/s per channel max; throughput rate may belimited on USB 1.1 ports.
16 bits±2.0± 0.5 LSB typ±1.0 LSB max
81 db min81 db min
92 db min
92 db min

Software-paced
Scan to PC memory

Calibrated
Un-calibrated±10 V range±5 V range±2 V range±1 V range

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USB-1608HS-2AO User's Guide

Note 1:

Specifications

The maximum differential non-linearity specification applies to the entire 0 °C to 55 °C temperature range of
the USB-1608HS-2AO. This specification also accounts for the maximum errors due to the software calibration(in Calibrated mode only) and the AD7685 analog to digital converter non-linearities.
Table 2. Calibrated absolute accuracy

Range

Accuracy (mV)

±10 V
±5 V
±2 V
±1 V

± 7.019± 3.509± 1.403± 0.702
Table 3. Accuracy components - All values are (±)

Range

Integral Non Linearity(% FSR)

Gain error at FS(mV)

Offset (mV)Gain tempco(ppm/°C)

Offset tempco(µV/°C)

±10 V
±5 V
±2 V
±1 V

0.009150.009150.009150.00915

4.578
2.289
0.916
0.458

1.526
0.763
0.305
0.153

3.8
7.0
16.5
40.1

19.5
19.5
24.3
29.2

Note 2:

When connecting differential inputs to floating input sources, the user must provide a DC return path from eachdifferential input to ground. This can be accomplished by simply connecting a resistor from each of thedifferential inputs to AGND. A value of approximately 100 kΩ can be used for most applications.
Table 4. Noise performance – all values are (±)

Range

Peak to Peak Noise(counts)

RMS noise
LSBrms

±10 V
±5 V
±2 V
±1 V

8
8
8
8

1.21
1.21
1.21
1.21

Table 4 summarizes the noise performance for the USB-1608HS-2AO. Noise distribution is determined bygathering 50 kS with inputs tied to ground at the user connector. Samples are gathered at the maximum
specified sampling rate of 250 kS/s.

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USB-1608HS-2AO User's Guide

Specifications

Analog output
Table 5. Analog output specifications
Parameter
Number of channels
Resolution
Output range
Throughput

Conditions

Specifications

Single channel
Two channel

Pacer source
Monotonicity
Glitch energy
Current output (Note 3)
Output short-circuit protection
Output couplingPower up and reset stateOutput connect to GND

Remote sense configuration
Remote sense compliance voltage(Note 4)
Remote sense compensation range(Note 5)
Output noise
Settling time (to 0.003%)

0 to 75 Ω max

20 V output step, (RL=5 kΩ,
CL=200 pf)

Slew rate
Absolute accuracy
Offset error drift
Gain error drift
Note 3:Note 4:Note 5:

Two independent
16 bits±10 V
70 kS/s
35 kS/sOnboard D/A clock
16 bits
200 nV/s±10 mA max single channel±20 mA max two channels
100 mS max
DC
DACs clear to midscale, (0 V, ±20 mV).
Remote sense is disabled.
Enabled or disabled through software
control.
±10.75 V max

100 nV/Hz
5 µS max
10 V/µs±0.25% of FSR max±4 ppm/°C±10 ppm/°C

The maximum load that the analog output can drive is calculated by dividing the full-scale output voltage by thecurrent output specification or (10 V/10 mA) = 1000 Ω. This calculation is valid whether the Remote Sensefeature is enabled or disabled.
The USB-1608HS-2AO Remote Sense feature can compensate for any series resistance up to 75 Ω between its
force terminal pins and its output load.
Rload should not exceed the specified 1000 Ω, and the Rseries should not exceed its specified limit of 75 Ω.

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USB-1608HS-2AO User's Guide

Specifications

Analog input calibration
Table 6. Analog input calibration specifications
Parameter

Specifications

Recommended warm-up time
Calibration method
Calibration interval
Calibration reference

15 minutes min
Software calibration
1 year
+10.000 V, ±5 mV max. Actual measured values stored in EEPROM
Tempco: 5 ppm/°C max
Long term stability: 30 ppm/1000 h

Digital input/output
Table 7. Digital I/O specifications
Digital type
Number of I/O
Configuration
Pull-up/pull-down configuration
Digital I/O transfer rate (system-paced)
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
LED indicators

5 V CMOS
16
Eight input, eight output
The eight input pins have 47 k resistors that may be configured to either pull-up
or pull-down with a jumper
System-dependent, 33 to 8000 port reads/writes or single bit reads/writes per
second.
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
Outputs: driven low
Each I/O pin has an associated LED status indicator. A high at the pin willcause the LED to be on. The LEDs may be disabled with jumpers - one jumper
for the input LEDs (JP1), and one jumper for the output LEDs (JP2).

External trigger
Table 8. External trigger specifications
Parameter
Trigger source
Trigger input range
Absolute maximum input voltage

Conditions

Specification

TRIG_IN to GND

Trigger threshold levels
Input impedance
Trigger modes

Threshold resolution
Threshold accuracy
Hysteresis
Full power bandwidth (–3 dB)

22

TRIG_IN input±10 V max
±25 V max (power on)±15 V max (power off)
±10V/4096; Software configurable
1 MΩ (power on)
1.5 kΩ (power off)
Software configurable for:
 Positive or negative slope Edge/level
 Retrigger
12 bits, 1 in 4096
±0.25% FSR±5 mV
640 kHzUSB-1608HS-2AO User's Guide

Specifications

External clock input/output
Table 9. External clock I/O specifications
Parameter

Conditions

Specification

Pin names
Pin type
Pin descriptions

Input clock rate
Clock pulse width
Input leakage current
Input high voltage
Input low voltage
Output high voltage (Note 6)
Output low voltage (Note 6)
Note 6:SYNC_IN, SYNC_OUT
SYNC_IN: Input
SYNC_OUT: Output
Outputs A/D pacer clock.
Receives A/D pacer clock from external source.
Rising edge sensitive.
250 kHz max
1 µs min2 µs min±2.0 µA
3.5 V min, 6.5 V absolute max
1.5 V max, –0.5 V absolute min
3.3 V min
3.8 V min
1.1 V max
0.6 V max

SYNC_OUTSYNC_INSYNC_INSYNC_OUTIOH = –2.5 mA
No load
IOL = 2.5 mA
No loadSYNC_OUT is over-current protected with a 200 Ω series resistor.

CounterTable 10. Counter specifications
Pin name (Note 7)
Counter type
Number of channels
Input type
Input source
Resolution
Schmidt trigger hysteresis
Input leakage current
Maximum input frequency
High pulse width
Low pulse width
Input high voltage
Input low voltage
Note 7:

CTR
Event counter
1
TTL, rising edge triggered
CTR screw terminal
32 bits
0.58 V to 0.93 V
±5 µA
1 MHz
500 ns min
500 ns min
2.4 V min, 6.5 V absolute max
2.19 V max, –0.5 V absolute min

CTR is a Schmitt trigger input protected with a 1 kΩ series resistor.

MemoryTable 11. Memory specifications
Data FIFOEEPROM

65536 samples, 131,072 bytes
512 bytes

23USB-1608HS-2AO User's Guide

Specifications

Microcontroller
Table 12. Microcontroller specifications
Type
Program memory
Data memory

High performance 8-bit RISC microcontroller
16,384 words
2,048 bytes

Power
Table 13. Power specifications
Parameter

Conditions

Specification

Supply current (Note 8)+5V EXT output voltage range (Note 9)+5V EXT output current (Note 10)

Continuous mode

920 mA
4.5 V min, 5.25 V max+10 mA max

Note 8:Note 9:Note 10:

This is the total current requirement for the USB-1608HS-2AO. This specification does not include any
additional contribution due to +5VEXT output current, analog output source current, or DIO loading.
Output voltage range assumes input power supply is within specified limits.
This refers to the total amount of current that can be sourced from the +5VEXT terminal pin for general use.

External power input
Table 14. External power input specifications
External power input
External power adapter+5.0 VDC (+5 V power supply included)+5 V, ±5% @ 2 A

USB specifications
Table 15. USB specifications
USB device typeUSB device compatibility
USB cable length
USB cable type

USB 2.0 (high-speed)
USB 1.1, 2.0
Three meters max
A-B cable, UL type AWM 2527 or equivalent (minimum 24 AWG
VBUS/GND, minimum 28 AWG D+/D-).

Environmental
Table 16. Environmental specifications
Operating temperature range
Storage temperature range
Humidity

0 to 55 °C max–40 to 85 °C max
0 to 90% non-condensing

Mechanical
Table 17. Mechanical specifications
Card dimensions (L × W ×H)
Enclosure dimensions (L × W ×H)

203.2 mm × 121.9 × 15.2 mm
8.0 × 4.8 × 0.6 in.
241.3 × 125.7 × 58.9 mm
9.50 × 4.95 × 2.32 in.

24

USB-1608HS-2AO User's Guide

Specifications

Signal connector
Table 18. Screw terminal specifications
Connector type
Wire gauge range

Screw terminal
16 AWG to 30 AWG

Screw terminal pinout
Table 19. 8-channel differential mode
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27

Signal name
GND
DI0
DI1
DI2
DI3
DI4
DI5
DI6
DI7
GND
DO0
DO1
DO2
DO3
DO4
DO5
DO6
DO7
GND
SYNC_INSYNC_OUT+5V EXTCTR
TRIG_IN
VDAC0_F
VDAC0_S
AGND

Pin
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54

25

Signal name
VDAC1_F
VDAC1_S
AGND
CH0_L
CH0_H
AGND
CH1_L
CH1_H
AGND
CH2_L
CH2_H
AGND
CH3_L
CH3_H
AGND
CH4_L
CH4_H
AGND
CH5_L
CH5_H
AGND
CH6_L
CH6_H
AGND
CH7_L
CH7_H
AGND

USB-1608HS-2AO User's Guide

Specifications

Table 20. 8-channel single-ended mode
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27

Signal name
GND
DI0
DI1
DI2
DI3
DI4
DI5
DI6
DI7
GND
DO0
DO1
DO2
DO3
DO4
DO5
DO6
DO7
GND
SYNC_INSYNC_OUT+5V EXTCTR
TRIG_IN
VDAC0_F
VDAC0_S
AGND

Pin
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54

26

Signal name
VDAC1_F
VDAC1_S
AGND
NC
CH0_H
AGND
NC
CH1_H
AGND
NC
CH2_H
AGND
NC
CH3_H
AGND
NC
CH4_H
AGND
NC
CH5_H
AGND
NC
CH6_H
AGND
NC
CH7_H
AGND

Declaration of Conformity
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-1608HS-2AO
to which this declaration relates is in conformity with the relevant provisions of the following standards or otherdocuments:
EC EMC Directive 2004/108/EC: General Requirements, EN 61326-1:2006 (IEC 61326-1:2005).
Emissions:EN 55011 (2007) / CISPR 11(2003): Radiated emissions: Group 1, Class A
EN 55011 (2007) / CISPR 11(2003): Conducted emissions: Group 1, Class A

Immunity: EN 61326-1:2006, Table 3.


IEC 61000-4-2 (2001): Electrostatic Discharge immunity.
IEC 61000-4-3 (2002): Radiated Electromagnetic Field immunity.

To maintain compliance to the standards of this declaration, the following conditions must be met.







The host computer, peripheral equipment, power sources, and expansion hardware must be CE
compliant.
All I/O cables must be shielded, with the shields connected to ground.
I/O cables must be less than 3 meters (9.75 feet) in length.
The host computer must be properly grounded.
The host computer must be USB 2.0 compliant.
Equipment must be operated in a controlled electromagnetic environment as defined by Standards EN
61326-1:2006, or IEC 61326-1:2005.

Note: Data acquisition equipment may exhibit noise or increased offsets when exposed to high RF fields(>1V/m) or transients.
Declaration of Conformity based on tests conducted by Chomerics Test Services, Woburn, MA 01801, USA in
June, 2007. Test records are outlined in Chomerics Test Report #EMI4813.07. Further testing was conductedby Chomerics Test Services, Woburn, MA. 01801, USA in March, 2009. Test records are outlined in Chomerics
Test Report #EMI5271.09.
We hereby declare that the equipment specified conforms to the above Directives and Standards.

Carl Haapaoja, Director of Quality Assurance

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

NI Hungary Kft
H-4031 Debrecen, Hátar út 1/A, Hungary
Phone: +36 (52) 515400
Fax: +36 (52) 515414
http://hungary.ni.com/debrecen