USB-1608GX
Multifunction DAQ Device

User's Guide

January 2019. Rev 2© Measurement Computing

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use in life support systems and/or devices without prior written consent from Measurement Computing
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not subject to the testing required to ensure a level of reliability suitable for the treatment and diagnosis ofpeople.

USB-1608GX

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-1608GX ............................................................................................................... 6
Functional block diagram ................................................................................................................................... 6
Chapter 2

Installing the USB-1608GX ................................................................................................................... 7
Unpacking........................................................................................................................................................... 7
Installing the software ........................................................................................................................................ 7
Installing the hardware ....................................................................................................................................... 7
Calibrating .......................................................................................................................................................... 7
Self-calibration ................................................................................................................................................................. 7
Factory calibration ............................................................................................................................................................ 7

Firmware updates ............................................................................................................................................... 7
Chapter 3

Functional Details ................................................................................................................................. 8
Analog input modes ............................................................................................................................................ 8
Software paced .................................................................................................................................................................. 8
Hardware paced ................................................................................................................................................................ 8

Burst mode.......................................................................................................................................................... 8External components .......................................................................................................................................... 9USB connector .................................................................................................................................................................. 9
LEDs ................................................................................................................................................................................. 9Screw terminals................................................................................................................................................................. 9Signal connections ............................................................................................................................................ 11
Analog input ....................................................................................................................................................................11
External clock I/O ............................................................................................................................................................12
Digital I/O ........................................................................................................................................................................12
Trigger input ....................................................................................................................................................................13
Counter input ...................................................................................................................................................................13
Timer output ....................................................................................................................................................................14
Power output ....................................................................................................................................................................14
Ground .............................................................................................................................................................................14

Mechanical drawings ........................................................................................................................................ 15
Chapter 4

Specifications ...................................................................................................................................... 16
Analog input ..................................................................................................................................................... 16
Accuracy ........................................................................................................................................................... 17
Analog input DC voltage measurement accuracy ............................................................................................................17
Noise performance ...........................................................................................................................................................17
Settling time .....................................................................................................................................................................17

Analog input calibration ................................................................................................................................... 17
Digital input/output........................................................................................................................................... 18
External trigger ................................................................................................................................................. 18
External clock input/output............................................................................................................................... 19Counter ............................................................................................................................................................. 193

USB-1608GX User's Guide

Timer ................................................................................................................................................................ 20
Memory ............................................................................................................................................................ 20
Power ................................................................................................................................................................ 20
USB .................................................................................................................................................................. 20
Environmental .................................................................................................................................................. 21
Mechanical ....................................................................................................................................................... 21
Screw terminal connector ................................................................................................................................. 21
Differential mode pinout ..................................................................................................................................................21
Single-ended mode pinout ...............................................................................................................................................22

EU Declaration of Conformity ............................................................................................................ 23

4

Preface

About this User's Guide
What you will learn from this user's guideThis user's guide describes the Measurement Computing USB-1608GX 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

Bold text is used for the names of objects on a screen, such as buttons, text boxes, and check boxes.

italic text

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-1608GX is available on our website at www.mccdaq.com. You can also
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-1608GX
The USB-1608GX is a USB 2.0 high-speed device that provides the following features:






16 single-ended (SE) or eight differential (DIFF) analog input channels
Eight individually configurable digital I/O channels
Two counter channels (32-bit) that count TTL pulses
One timer output channel (32-bit)Screw terminals for field wiring connections

The USB-1608GX is powered by the +5 volt USB supply from your computer; no external power is required. A
USB cable is shipped with the device.
The USB-1608GX device is compatible with both USB 1.1 and USB 2.0 ports. The speed of the device may belimited when using a USB 1.1 port due to the difference in transfer rates on the USB 1.1 versions of the
protocol (low-speed and full-speed).

Functional block diagram
USB-1608GX functions are illustrated in the block diagram shown here.

Figure 1. Functional block diagram

6

Chapter 2

Installing the USB-1608GX
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 missing or damaged.

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

Installing the hardware
To connect a USB-1608GX to your system, turn on your computer and connect the USB cable to an available
USB port on the computer or to an external USB hub connected to the computer. Connect the other end of theUSB cable to the USB connector on the device. No external power is required.
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.
A green Status LED indicates the device status. When the LED is on, the device is powered and ready for
operation. When the LED is off, the device is not powered or did not initialize. Figure 3 on page 9 shows thelocation of the Status LED. If the Status LED is on but then turns off, the computer has lost communication
with the device. To restore communication, disconnect the USB cable from the computer and then reconnect it.
This should restore communication, and the LED should turn on.
Caution! Do not disconnect any device from the USB bus while the computer is communicating with
the USB-1608GX, or you may lose data and/or your ability to communicate with the device.

Calibrating
Self-calibration
The USB-1608GX supports self-calibration with InstaCal. Calibrate the device whenever the ambient
temperature changes by more than ±10 °C from the last self-calibration.

Factory calibration
The Measurement Computing Manufacturing Test department performs the initial factory calibration. Contact
Measurement Computing for details about how to return your device and have it calibrated to the factory
specifications.

Firmware updatesYour DAQ device contains firmware that can be updated in the field if required. Firmware is available fordownload at www.mccdaq.com/firmware.aspx.We recommend that you check this page periodically to see if an
update to your device firmware is available.
7Chapter 3

Functional Details
Analog input modes
The USB-1608GX device can acquire analog input data in two basic modes – software paced and hardware
paced.

Software paced
You can acquire one analog sample at a time in software paced mode. You initiate the A/D conversion with asoftware 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.
The sample rate in software paced mode is system-dependent and can range from 33 S/s to 4000 S/s.

Hardware paced
You can acquire data from up to 16 channels in hardware paced mode. The analog data is continuously
acquired, converted to digital values, and written into the FIFO buffer on the device until you stop the scan. The
FIFO buffer is serviced in blocks as the data is transferred from the FIFO buffer to the computer memory
buffer. You start a continuous scan with either a software command or with an external hardware trigger event.
The maximum sampling rate in hardware paced mode from one to 16 channels is 500 kS/s aggregate.

Burst mode
When using the onboard pacer, you can enable burst mode for more precise timing between samples. Whenburst mode is enabled, each successive channel in a scan is sampled at the maximum A/D rate. This ensures thatsamples from each channel are taken as close as possible to the same absolute point in time. When burst mode
is disabled, data is sampled at evenly spaced intervals, allowing maximum settling time and best amplitudeaccuracy. Multi-channel scanning with burst mode enabled and disabled is shown in Figure 2.

Figure 2. Multi-channel scan with burst mode enabled and disabled

The burst mode sample period is 2 µs.
You can trigger the acquisition with the external trigger, and control the clock period with the internal orexternal A/D pacer clock. Pacing from the external clock always operates with burst mode enabled.

8

USB-1608GX User's Guide

Functional Details

External components
The USB-1608GX has the following external components (see Figure 3):

USB connector
LEDs
Screw terminals

1
2
3

Screw terminal pins 1 to 27
Screw terminal pins 28 to 54
Status LED

4
5

Activity LED
USB connector

Figure 3. External components

USB connector
The USB connector provides +5 V power and communication. No external power supply is required.

LEDs
The USB-1608GX has two LEDs – Status and Activity.
The Status LED turns on when the device is detected and installed on the computer.
The Activity LED blinks when data is transferred, and is off otherwise.

Figure 3 shows the location of each LED.

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

16 SE (CH0 to CH15) or eight DIFF (CH0H/CH0L to CH7H/CH7L) analog inputs
Eight digital I/O bits (DIO0 to DIO7)
One external clock input (AICKI) and one external clock output (AICKO) for analog inputs
One digital trigger input (TRIG)
Two counter inputs (CTR0, CTR1)
One timer output (TMR)
One power output (+5V)
Analog ground (AGND) and digital ground (GND) connections

The single-ended mode pinout is shown in Figure 4, and the differential mode pinout is shown in Figure 5.

9USB-1608GX User's Guide

Functional Details

Figure 4. SE mode pinout

Figure 5. DIFF mode pinout

10USB-1608GX User's Guide

Functional Details

Signal connections
Analog input
You can configure the analog inputs for SE or DIFF mode. The input voltage range is software selectable for±10 V, ±5 V, ±2 V, or ±1 V.
With SE mode, connect up to 16 inputs to screw terminals CH0 to CH15. SE mode requires two wires:

Connect one wire to the signal you want to measure (CHx).
Connect one wire to the analog ground reference (AGND).

Refer to Figure 4 on page 10 for the location of the SE inputs.
With DIFF mode, connect up to eight differential inputs to screw terminals CH0H/CH0L to CH7H/CH7L.
DIFF mode requires two wires plus a ground reference:Connect one wire to the high/positive signal (CHxH).
Connect one wire to the low/negative signal (CHxL).
Connect one wire to the analog ground reference (AGND).

Refer to Figure 5 on page 10 for the location of the DIFF inputs.
Floating voltage source
When connecting DIFF voltage inputs to a "floating" voltage source, make sure the DIFF input channel has a
DC return path to ground. To create this path, connect a resistor from each low channel input to an AGND pin.
A value of approximately 100 kΩ can be used for most applications.
Leave unused input channels either floating or tied to an AGND terminal. Source impedances should be kept as
small as possible to avoid settling time and accuracy errors.
Figure 6 shows DIFF channels 0-3 connected to a ground path resistor.

Figure 6. DIFF connections with ground path resistor

Channel-gain queue
The USB-1608GX channel-gain queue feature allows you to configure a list of channels, modes, and gains foreach scan. The settings are stored in a channel-gain queue list that is written to local memory on the device.
The channel-gain queue list contains one or more channel numbers, modes, and range settings. You canconfigure up to 16 elements. The channels can be listed in any order, and can include duplicate channels forsampling at different ranges.

11USB-1608GX User's Guide

Functional Details

An example of a 4-element list is shown in the table below.
Sample channel-gain queue list
Element

Channel

Range

Mode

0
1
2
3

CH5
CH1
CH15
CH5

BIP5V
BIP10V
BIP1V
BIP5V

SE
DIFF
SE
SE

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.
For more information about analog signal connections
For more information about analog input connections, refer to the Guide to DAQ Signal Connections on our
website at www.mccdaq.com/support/DAQ-Signal-Connections.aspx.

External clock I/O
The device has one external clock input (AICKI) and one external clock output (AICKO) for the analog inputs.
When using an external clock, AICKO outputs the pulse generated from AICKI.
When using the internal clock, AICKO outputs the ADC scan clock.

Digital I/O
You can connect up to eight digital I/O lines to DIO0 through DIO7. Each digital channel is individuallyconfigurable for input or output. The digital I/O terminals can detect the state of any TTL-level input. Refer tothe schematic shown in Figure 7.

Figure 7. Schematic showing switch detection by digital channel DIO0

If you set the switch to the +5 V input, DIO0 reads TRUE (1). If you move the switch to GND, DIO0 reads
FALSE (0).
Internal pull-up/down configuration
Unconnected inputs are pulled low by default to 0 V through 47 kΩ resistors via jumper W1 on the circuitboard. The pull-up/pull-down voltage is common to all 47 kΩ resistors. Complete the following steps toconfigure these inputs to pull high (+5V).
Caution! The discharge of static electricity can damage some electronic components. Before removing thedevice from its housing, ground yourself using a wrist strap or touch the computer chassis or othergrounded object to eliminate any stored static charge.
1.

Turn the device over and rest the top of the housing on a flat, stable surface.

2.

Peel off the four rubber feet on the bottom of the device to access the screws.

3.

Remove the four screws from the bottom of the device.

4.

Hold both the top and bottom sections together, turn the device over and rest it on the surface, thencarefully remove the top section of the case to expose the circuit board.

12USB-1608GX User's Guide

5.

Functional Details

Configure jumper W1 for either pull-up or pull-down. The jumper is configured by default for pull-down.
Figure 8 shows the location of the jumper on the board.

Figure 8. W1 jumper location

Figure 9 shows the jumper configured for pull-up and pull-down.

Figure 9. W1 jumper configurations

6.

Replace the top section of the case, and fasten it to the bottom section with the four screws. Replace therubber feet onto each screw.

For more information about digital signal connections
For general information about digital signal connections and digital I/O techniques, refer to the Guide to DAQ
Signal Connections on our website at www.mccdaq.com/support/DAQ-Signal-Connections.aspx.

Trigger input
The TRIG terminal is an external digital trigger input. The trigger mode is software selectable for edge or levelsensitive.


Edge sensitive mode is configurable for rising or falling edge.
Level sensitive mode is configurable for high or low level.

The default setting at power up is edge sensitive, rising edge.
Retrigger mode
Retrigger mode lets you set up repetitive analog input or output trigger events. The trigger is automatically rearmed after it is activated. Use software to set the A/D or D/A trigger count (the number of samples you want
per trigger).

Counter input
The CTR0 and CTR1 terminals are 32-bit event counters that can accept frequency inputs up to 20 MHz. Theinternal counter increments when the TTL levels transition from low to high.

13

USB-1608GX User's Guide

Functional Details

Timer output
The TMR terminal is a pulse width modulation (PWM) timer output that can generate a pulse output with aprogrammable frequency in the range of 0.0149 Hz to 32 MHz. The timer output parameters are software
selectable. Figure 10 shows the timer output schematic.

Figure 10. Timer output schematicPower output
The +5V terminal can output up to 10 mA maximum. You can use this terminal to supply power to external
devices or circuitry.
Caution! The +5V terminal is an output. Do not connect to an external power supply or you may damage thedevice and possibly the computer.

GroundThe analog ground (AGND) terminals provide a common ground for all analog channels.
The digital ground (GND) terminals provide a common ground for the digital, counter, timer, and clock
channels and the power terminal.

14

USB-1608GX User's Guide

Functional Details

Mechanical drawings

Figure 11. USB-1608GX circuit board (top) and enclosure dimensions

15

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. General analog input specifications
Parameter

Condition

Specification

A/D converter type
ADC resolution

Successive approximation
16 bits

Number of channels

8 differential, 16 single-ended
Software-selectable±10 V, ±5 V, ±2 V, ±1 V
Software-selectable per channel
 ±25 V max (power on)
 ±15 V max (power off) 1 GΩ (power on)
 820 Ω (power off)
±10 nA
870 kHz

Input voltage range
Absolute max input voltage

CHx relative to AGND

Input impedance
Input bias current
Input bandwidth
Input capacitance
Max working voltage (signal+ common mode)

Common mode rejection ratio
CrosstalkAll input ranges,
small signal (–3 dB)±10V range±5V range±2V range±1V range(fIN = 60 Hz, all input
ranges)Adjacent differential modechannels, DC to 100 kHz

Input coupling
Sampling rate
Trigger source
Sample clock source
Burst mode

Throughput
Channel gain queue
Warm-up time

60 pf
±10.2 V max relative to AGND
±10.2 V max relative to AGND
±9.5 V max relative to AGND
±9.0 V max relative to AGND
86 dB
–75 dBDC
0.0149 Hz to 500 kHz; software-selectable
TRIG (see External trigger on page 18)
Internal A/D clock or external A/D clock (AICKI pin)
2 µs
Software-selectable using the internal A/D clock; always
enabled when using the external clock (AICKI pin).
33 to 4000 S/s typ, system dependent
500 kS/s max
Software-selectable range for each channel
15 minutes min

Software paced
Hardware paced
Up to 16 elements

16USB-1608GX User's Guide

Specifications

Accuracy
Analog input DC voltage measurement accuracy
Table 2. DC Accuracy components and specifications. All values are (±)

Range

Gain error(% of reading)

Offset error(µV)

INL error(% of range)

Absolute
accuracy at
Full Scale
(µV)

±10 V
±5 V
±2 V
±1 V

0.024
0.024
0.024
0.024

915
686
336
245

0.00760.00760.00760.0076

4075
2266
968
561

Gain
temperature
coefficient(% reading/°C)

Offsettemperature
coefficient(µV/°C)

0.00140.00140.00140.001447
24
10
5

Noise performance
For the peak-to-peak noise distribution test, a differential input channel is connected to AGND at the input
terminal block, and 32,000 samples are acquired at the maximum rate available at each setting.
Table 3. Noise performance specifications
Range

Counts

LSBrms

±10 V
±5 V
±2 V
±1 V

6
6
7
9

0.91
0.91
1.06
1.36

Settling time
Settling time is defined as the accuracy that can be expected after one conversion when switching from achannel with a DC input at one extreme of full scale to another channel with a DC input at the other extreme offull scale. Both input channels are configured for the same input range.
Table 4. Input settling time specifications in µS, typicalRange

2 µS settling accuracy(% FSR)

4 µS settling accuracy(% FSR)

9 µS settling accuracy(% FSR)

±10 V
±5 V
±2 V
±1 V

0.1251
0.06870.06870.06870.00310.00310.00310.00310.00150.00150.00150.0015

Analog input calibration
Table 5. Analog input calibration specifications
Parameter

Specification

Recommended warm-up time
Calibration method
Calibration interval
Calibration reference

15 minutes min
Self-calibration (firmware)
1 year (factory calibration)+5 V, ±2.5 mV max. Actual measured values stored in EEPROM.
Tempco: 5 ppm/°C max
Long term stability: 15 ppm/1000 hours

17USB-1608GX User's Guide

Specifications

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

Specification

Digital type
Number of I/O
Configuration
Pull-up configuration

CMOS
8
Each bit may be configured as input (power on default) or output
The port has 47 kΩ resistors configurable as pull-ups or pull-downs (default) via
internal jumper (W1).
33 to 8000 port reads/writes or single bit reads/writes per second typ,system dependent.
2.0 V min
5.5 V absolute max
0.8 V max
–0.5 V absolute min
0 V recommended min
4.4 V min (IOH = –50 µA)
3.76 V min (IOH = –2.5 mA)
0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 2.5 mA)±2.5 mA max

Digital I/O transfer rate(system-paced)
Input high voltage
Input low voltage

Output high voltage
Output low voltage
Output current

External trigger
Table 7. External trigger specifications
Parameter

Specification

Trigger source
Trigger mode

TRIG input
Software programmable for edge or level sensitive, rising or falling edge, high or low
level. Power on default is edge sensitive, rising edge.
1 µs + 1 clock cycle max
100 ns min
Schmitt trigger, 33 Ω series resistor and 49.9 kΩ pull-down to ground
0.4 V to 1.2 V
2.2 V min
5.5 V absolute max
1.5 V max
–0.5 V absolute min
0 V recommended min

Trigger latency
Trigger pulse width
Input type
Schmitt trigger hysteresis
Input high voltage
Input low voltage

18USB-1608GX User's Guide

Specifications

External clock input/output
Table 8. External clock I/O specifications
Parameter

Specification

Terminal names
Terminal types

AICKI, AICKOAICKI: Input, active on rising edge
AICKO: Output, power on default is 0 V, active on rising edge
AICKI: Receives sampling clock from external source
AICKO: Outputs the internal A/D sampling clock, or the pulse generated from AICKI
when in external clock mode.
500 kHz max
AICKI: 400 ns min
AICKO: 400 ns min
Schmitt trigger, 33 Ω series resistor, 47 kΩ pull-down to ground
0.4 V to 1.2 V
2.2 V min
5.5 V absolute max
1.5 V max
–0.5 V absolute min
0 V recommended min
4.4 V min (IOH = –50 µA)
3.76 V min (IOH = –2.5 mA)
0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 2.5 mA)±2.5 mA max

Terminal descriptions

Input clock rate
Clock pulse width
Input type
Schmitt trigger hysteresis
Input high voltage
Input low voltage

Output high voltage
Output low voltage
Output current

CounterTable 9. Counter specifications
Parameter

Specification

Terminal names
Number of channels
Resolution
Counter type
Input type
Input source

CTR0, CTR1
2 channels
32-bitEvent counter
Schmitt trigger, 33 Ω series resistor, 47 kΩ pull-down to ground
CTR0 (pin 52)
CTR1 (pin 51)
33 to 8000 reads/writes per second typ, system dependent

Counter read/writes rates(software paced)
Input high voltage
Input low voltage
Schmitt trigger hysteresis
Input frequency
High pulse width
Low pulse width

2.2 V min, 5.5 V max
1.5 V max, –0.5 V min
0.4 V min, 1.2 V max
20 MHz, max
25 ns, min
25 ns, min19

USB-1608GX User's Guide

Specifications

Timer
Table 10. Timer specifications
Parameter

Specification

Terminal nameTimer typeOutput value
Internal clock frequency
Register widths
High pulse width
Low pulse width
Output high voltage

TMR
PWM output with count, period, delay, and pulse width registers
Default state is idle low with pulses high, software-selectable output invert
64 MHz32-bit15.625 ns min
15.625 ns min
4.4 V min (IOH = –50 µA)
3.76 V min (IOH = –2.5 mA)
0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 2.5 mA)±2.5 mA max

Output low voltage
Output current

MemoryTable 11. Memory specifications
Parameter

Specification

Data FIFO
Non-volatile memory

4 kS analog input
32 KB (28 KB firmware storage, 4 KB calibration/user data)

Power
Table 12. Power specifications
Parameter

Condition

Specification

Supply current (Note 1)+5 V user output voltage range+5 V user output current

Quiescent current
Available at terminal block pin 42
Available at terminal block pin 42

230 mA
4.5 V min to 5.25 V max
10 mA max

Note 1:This is the total quiescent current requirement for the device that includes up to 10 mA for the Status LED. This
does not include any potential loading of the digital I/O bits or the +5V terminal.

USB
Table 13. USB specifications
Parameter

Specification

USB device type
Device compatibility
USB cable type

USB 2.0 (high-speed)
USB 1.1, USB 2.0
A-B cable, UL type AWM 2725 or equivalent. (Min 24 AWG VBUS/GND,
min 28 AWG D+/D–)
3 m (9.84 ft) max

USB cable length20

USB-1608GX User's Guide

Specifications

Environmental
Table 14. Environmental specifications
Parameter

Specification

Operating temperature range
Storage temperature range
Humidity

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

Mechanical
Table 15. Mechanical specifications
Parameter

Specification

Dimensions (L × W × H)User connection length

127 × 89.9 × 35.6 mm (5.00 × 3.53 × 1.40 in.)3 m (9.84 ft) max

Screw terminal connector
Table 16. Screw terminal connector specifications
Parameter

Specification

Connector type
Wire gauge range

Screw terminal
16 AWG to 30 AWG

Differential mode pinout
Table 17. 8-channel differential mode pinout
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
CH0H
CH0L
AGND
CH1H
CH1L
AGND
CH2H
CH2L
AGND
CH3H
CH3L
AGND
NC
AGND
NC
AGND
empty
GND
DIO0
DIO1
DIO2
DIO3
DIO4
DIO5
DIO6
DIO7
GND
NC

Pin description
AI channel 0 HI
AI channel 0 LO
Analog groundAI channel 1 HI
AI channel 1 LO
Analog groundAI channel 2 HI
AI channel 2 LO
Analog groundAI channel 3 HI
AI channel 3 LO
Analog groundNo connection
Analog groundNo connection
Analog ground

Pin
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43

Digital ground
DIO channel 0
DIO channel 1
DIO channel 2
DIO channel 3
DIO channel 4
DIO channel 5
DIO channel 6
DIO channel 7
Digital groundNo connection

44
45
46
47
48
49
50
51
52
53
54

21

Signal name
CH7L
CH7H
AGND
CH6L
CH6H
AGND
CH5L
CH5H
AGND
CH4L
CH4H
AGND
AGND
AGND
+5V
AGND
empty
GND
AICKI
AICKO
NC
NC
TRIG
GND
CTR1
CTR0
TMR
GND

Pin description
AI channel 7 LO
AI channel 7 HI
Analog groundAI channel 6 LO
AI channel 6 HI
Analog groundAI channel 5 LO
AI channel 5 HI
Analog groundAI channel 4 LO
AI channel 4 HI
Analog ground
Analog ground
Analog ground+5V power output
Analog ground
Digital ground
AI clock input
AI clock output
No connection
No connection
Trigger input
Digital ground
Counter 1 input
Counter 0 input
Timer output
Digital groundUSB-1608GX User's Guide

Specifications

Single-ended mode pinout
Table 18. 16-channel single-ended mode pinout
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
CH0
CH8
AGND
CH1
CH9
AGND
CH2
CH10
AGND
CH3
CH11
AGND
NC
AGND
NC
AGND
empty
GND
DIO0
DIO1
DIO2
DIO3
DIO4
DIO5
DIO6
DIO7
GND
NC

Pin description
AI channel 0
AI channel 8
Analog groundAI channel 1
AI channel 9
Analog groundAI channel 2
AI channel 10
Analog groundAI channel 3
AI channel 11
Analog groundNo connection
Analog groundNo connection
Analog ground

Pin
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43

Digital ground
DIO channel 0
DIO channel 1
DIO channel 2
DIO channel 3
DIO channel 4
DIO channel 5
DIO channel 6
DIO channel 7
Digital groundNo connection

44
45
46
47
48
49
50
51
52
53
54

22

Signal name
CH15
CH7
AGND
CH14
CH6
AGND
CH13
CH5
AGND
CH12
CH4
AGND
AGND
AGND
+5V
AGND
empty
GND
AICKI
AICKO
NC
NC
TRIG
GND
CTR1
CTR0
TMR
GND

Pin description
AI channel 15
AI channel 7
Analog groundAI channel 14
AI channel 6
Analog groundAI channel 13
AI channel 5
Analog groundAI channel 12
AI channel 4
Analog ground
Analog ground
Analog ground+5V power output
Analog ground
Digital ground
AI clock input
AI clock output
No connection
No connection
Trigger input
Digital ground
Counter 1 input
Counter 0 input
Timer output
Digital ground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.
July 21, 2016, Norton, Massachusetts USA
EMI5736.10

Measurement Computing Corporation declares under sole responsibility that the productUSB-1608GX
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)
Safety: EN 61010-1:2010 (IEC 61010-1:2010)
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

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