USB-1208HS-2AO
High-Speed Analog Input and Digital I/O

User's Guide

Document Revision 4
July 2014© Copyright 2014

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HM USB-1208HS-2AO.docx

2

Table of Contents
Preface

About this Manual ................................................................................................................................. 5
Conventions ........................................................................................................................................................ 5
Where to find more information ......................................................................................................................... 5
Chapter 1

Introducing the USB-1208HS-2AO ...................................................................................................... 6
Functional block diagram ................................................................................................................................... 6
Chapter 2

Installing the USB-1208HS-2AO .......................................................................................................... 7
What comes with your shipment? ....................................................................................................................... 7
Hardware .......................................................................................................................................................................... 7
Software ............................................................................................................................................................................ 7
Documentation .................................................................................................................................................................. 7

Unpacking........................................................................................................................................................... 7
Installing the software ........................................................................................................................................ 7
Installing the hardware ....................................................................................................................................... 7
Calibrating the USB-1208HS-2AO .................................................................................................................... 8
Chapter 3

Functional Details ................................................................................................................................. 9
Analog input acquisition modes ......................................................................................................................... 9
Software paced mode ........................................................................................................................................................ 9
Hardware paced mode....................................................................................................................................................... 9External components .......................................................................................................................................... 9Screw terminals................................................................................................................................................................10
USB connector .................................................................................................................................................................11
Activity LED ...................................................................................................................................................................11
Status LED .......................................................................................................................................................................11

Signal connections ............................................................................................................................................ 11
Analog input ....................................................................................................................................................................11
Analog output ..................................................................................................................................................................12
External clock I/O ............................................................................................................................................................12
Digital I/O ........................................................................................................................................................................13
Counter input ...................................................................................................................................................................14
Timer output ....................................................................................................................................................................14
Trigger input ....................................................................................................................................................................15
Power output ....................................................................................................................................................................15
Ground .............................................................................................................................................................................15
Chapter 4

Specifications ...................................................................................................................................... 16
Analog input ..................................................................................................................................................... 16
Analog output ................................................................................................................................................... 18
Digital input/output........................................................................................................................................... 18
External trigger ................................................................................................................................................. 19
External clock input/output............................................................................................................................... 19Counters ............................................................................................................................................................ 20
Timer ................................................................................................................................................................ 20
Memory ............................................................................................................................................................ 20
Power ................................................................................................................................................................ 21
USB specifications ........................................................................................................................................... 21
3

USB-1208HS-2AO User's Guide

Environmental .................................................................................................................................................. 21
Mechanical ....................................................................................................................................................... 22
Screw terminal connector and pinout ............................................................................................................... 22
Declaration of Conformity .................................................................................................................. 24

4

Preface

About this ManualThis document describes the USB-1208HS-2AO data acquisition device and lists device specifications.

Conventions
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

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 USB-1208HS-2AO hardware 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
Phone: 508-946-5100 and follow the instructions for reaching Tech Support
Fax: 508-946-9500 to the attention of Tech Support
Email: techsupport@mccdaq.com

5Chapter 1

Introducing the USB-1208HS-2AO
The USB-1208HS-2AO is a high-speed analog input and digital I/O data acquisition device providing thefollowing features:










Eight 13-bit single-ended (SE) or four differential (DIFF) analog inputs
Two 12-bit analog outputs
One external clock input and one external output for analog inputs
One external clock input and one external output for analog outputs
One digital trigger input
16 individually configurable digital I/O channels
Two 32-bit counter inputs
One 32-bit timer output
Screw terminals for field wiring connections

The device is powered by the +5 volt USB supply from your computer, and requires no external power.
The USB-1208HS-2AO is a USB 2.0 high-speed device supported under popular Microsoft® Windows®
operating systems. The USB-1208HS-2AO is compatible with both USB 1.1 and USB 2.0 ports (although the
speed of the module maybe limited when using USB 1.1 ports).

Functional block diagram
USB-1208HS-2AO functions are illustrated in Figure 1.

Figure 1. USB-1208HS-2AO functional block diagram

6

Chapter 2

Installing the USB-1208HS-2AO
What comes with your shipment?
The following items are shipped with the USB-1208HS-2AO:

Hardware

USB-1208HS-2AO
USB cable

Software
MCC DAQ CD

Documentation
In addition to this hardware user's guide, you should also receive the Quick Start Guide. This booklet provides
an overview of the MCC DAQ software you received with the device, and includes information about installingthe software. Please read this booklet completely before installing any software or hardware.

UnpackingAs with any electronic device, take care while handling to avoid damage from static electricity. Before
removing the USB-1208HS-2AO from its packaging, ground yourself using a wrist strap or touch either thecomputer chassis or other grounded object to eliminate any stored static charge. If the device is damaged, notify
Measurement Computing Corporation immediately by phone, fax, or email.


Knowledgebase: kb.mccdaq.com
Phone: 508-946-5100 and follow the instructions for reaching Tech Support
Fax: 508-946-9500 to the attention of Tech Support
Email: techsupport@mccdaq.com

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

Installing the software
Refer to the Quick Start Guide for instructions on installing the software on the MCC DAQ CD. This booklet isavailable in PDF at www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf.

Installing the hardware
Be sure you are using the latest system software
Before you install the device, run Windows Update to update your operating system with the latest USB drivers.
Install the MCC DAQ software before you install your board
The driver needed to run your board is installed with the MCC DAQ software. Therefore, you need to install thesoftware before you install your board. Refer to the Quick Start Guide for instructions.
To connect the USB-1208HS-2AO to your system, turn your computer on, and connect the USB cable to a USB
port on your computer or to an external USB hub connected to your computer. The USB cable provides powerand communication to the USB-1208HS-2AO.
When you connect the USB-1208HS-2AO for the first time, a Found New Hardware dialog opens when theoperating system detects the device. The Status LED turns on; this indicates that communication is establishedbetween the device and the computer. Refer to Figure 2 on page 9 for the location of the Status LED. When the
dialog closes, the installation is complete.
7USB-1208HS-2AO User's Guide

Installing the USB-1208HS-2AO

Caution! Do not disconnect any device from the USB bus while the computer is communicating with thedevice, or you may lose data and/or your ability to communicate with the USB-1208HS-2AO.
If the Status LED turns off
The Status LED turns off if communication is lost between the device and the computer. To restore
communication, disconnect the USB cable from the computer and reconnect it. The Status LED should turn on.

Calibrating the USB-1208HS-2AO
The USB-1208HS-2AO is shipped fully calibrated. Calibration coefficients are stored in EEPROM.
Return the device to Measurement Computing Corporation when calibration is required. The normal calibrationinterval is once per year.

8Chapter 3

Functional Details
Analog input acquisition modes
The USB-1208HS-2AO can acquire analog input data in two basic modes – software paced and hardware
paced.

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 throughput sample rate in software paced mode is system-dependent, and can range from 33 S/s to4000 S/s.

Hardware paced mode
You can acquire data from up to eight channels in hardware-paced mode. The analog data is continuously
acquired, converted to digital values, and written to an onboard FIFO buffer on the USB-1208HS-2AO until
you stop the scan. The FIFO buffer is serviced in blocks as the data is transferred from the USB-1208HS-2AO
FIFO buffer to the memory buffer on your computer.
The maximum sample rate is 1 MS/s aggregate over one-to-eight channels. You can start a continuous scan witheither a software command or with an external hardware trigger event.

External components
The USB-1208HS-2AO has the following external components, as shown in Figure 2.


Screw terminal banks
LED indicators
USB connector

1
2
3

Screw terminal pins 1 to 28
Screw terminal pins 29 to 56
Status LED

4
5

Activity LED
USB connector

Figure 2. External components

9USB-1208HS-2AO User's Guide

Functional Details

Screw terminals
The differential mode pinout is shown in Figure 3.

Figure 3. Differential mode pinout

The single-ended mode pinout is shown in Figure 4.

Figure 4. Single-ended mode pinout

Use 16 AWG to 30 AWG for signal connections.

10

USB-1208HS-2AO User's Guide

Functional Details

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

Activity LED
The Activity LED indicates the communication status of the USB-1208HS-2AO. It blinks when data istransferred, and is off when the device is not communicating. This LED uses up to 10 mA of current and cannot
be disabled.

Status LED
The Status LED turns on when the device is detected and installed on the computer.

Signal connections
Analog input
You can connect up to eight analog input connections to the screw terminals labeled AIN0 through AIN7.
Analog signals are referenced to analog ground (AGND).
Single-ended mode requires two wires:

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

Differential mode requires two wires plus a ground reference:

The wire carrying the positive portion of the differential signal to be measured connects to AINx.
The wire carrying the negative portion of the differential signal to be measured connects to AIN(x+1).
The analog ground reference wire connects to AGND.

The terminal configurations for single-ended and differential modes are shown in the table below.
Channel #8 single-ended channels configuration 0

4 differential channels configuration

0
1
2
3
4
5
6
7

Vin+
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7

Vin+
AIN0
AIN2
AIN4
AIN6
-

Vin–
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND

Vin–
AIN1
AIN3
AIN5
AIN7
-

In single-ended mode, the input voltage ranges are ±10 V, ±5 V, ±2.5 V, 0 to 10 V. In differential mode, theinput voltage ranges are ±20 V, ±10 V, and ±5 V. The voltage level on each AINx input is limited to ±14 V

11

USB-1208HS-2AO User's Guide

Functional Details

Figure 5 depicts a voltage source connected to a USB-1208HS-2AO configured for SE mode.

Figure 5. Single-ended measurement connection

Figure 6 depicts a Wheatstone bridge signal source connected to a USB-1208HS-2AO configured for DIFF
mode.

Figure 6. Differential measurement connection

For more information on analog signal connections
For more information on single-ended inputs, refer to the Guide to DAQ Signal Connections (this document isavailable on our web site at www.mccdaq.com/signals/signals.pdf).

Analog output
You can connect up to two analog output connections to screw terminals AOUT0 to AOUT1. Refer to Figure 3
and Figure 4 on page 10 for the location of these pins.
Each channel can be software-paced at rates up to 5,000 updates per second (system-dependent), or hardwarepaced at rates up to 1 MS/s.
Each analog output on the USB-1208HS-2AO has a fixed ±10 V output range. The outputs default to 0 V atpower up.

External clock I/O
The USB-1208HS-2AO device provides one external clock input (AICKI) and one external clock output(AICKO) for analog inputs, and one external clock input (AOCKI) and one external clock output (AOCKO) for
analog outputs.

12USB-1208HS-2AO User's Guide

Functional Details

You can connect an external clock signal to AICKI and/or AOCKI.


When using an external clock, AICKO outputs the pulse generated from AOCKI , and AOCKO outputs thepulse generated from AOCKI
When using the internal clock, AICKO outputs the ADC scan clock, and AOCKO outputs the DAC scanclock.

Digital I/O
You can connect up to 16 digital I/O lines to screw terminals DIO0 through DIO15. The terminals have 47 kΩ
resistors that you can configure for pull-up or down using an internal jumper. The default configuration ispull-down.
You can use the digital I/O terminals to detect the state of any TTL-level input. Refer to the schematic shown in
Figure 7. 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).

Figure 7. Schematic showing switch detection by digital channel DIO0

Pull-up/down configuration
Each of the 16 DIO bits on the USB-1208HS-2AO has a 47 kΩ pull-up/pull-down resistor. To configure thesebits for either a +5 V pull-up or a 0 V pull-down option, open the device case to access the jumper labeled W34.
The pull-up/pull-down voltage is common to all of the internal 47 kΩ resistors.
Complete the following steps to set the W34 jumper:
1.

Turn over the USB-1208HS-2AO and rest it on its top on a flat, stable surface.

2.

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

3.

Remove the four screws shown in Figure 8 from the bottom of the device.

Figure 8. Location of screws connecting bottom and top sections of case4.

Holding both the top and bottom sections of the module, turn it back over, rest it on the surface, andcarefully remove the top section of the case.

5.

Set the jumper to either pull-up or pull-down (see Figure 9 and Figure 10).

13

USB-1208HS-2AO User's Guide

Functional Details

Figure 9. Location of W34 jumper (default pull-down setting shown)

Figure 10. Pull-down and pull-up configurations

6.

Replace the top section of the case, and then fasten it to the bottom section with the four screws.

For more information on digital signal connections
For general information regarding 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/signals/signals.pdf).

Counter input
CTR0 and CTR1 provide connections to each 32-bit counter input channel. Each counter can count frequenciesof up to 20 MHz.

Timer output
Use the TMR terminal to connect to the pulse width modulation (PWM) timer output. You can set the following
timer output parameters through software:






pulse frequency
duty cycle (pulse width divided by the pulse period)
number of pulses to generate
time delay before starting the timer output after it's enabledresting state of the output (idle high or idle low)

The timer can generate a pulse output with a programmable frequency range of 0.00931 Hz up to 20 MHz.

14

USB-1208HS-2AO User's Guide

Functional Details

Both the period and time delay ranges are 50 ns to 107.4 seconds.

Figure 11. USB-1208HS-2AO PWM timer channel

Trigger input
The TRIG connection is an external digital trigger input. The trigger mode is software selectable for:

Level-sensitive or edge-sensitive
Rising or falling edge
High or low level

The default setting at power up is edge sensitive, rising edge.
Retrigger
The acquisition uses the trigger settings for positive edge/negative edge and level-sensitive/edge-sensitive, but
automatically re-arms the trigger after it is activatedPower output
You can use the two +5V connections to supply power to external devices or circuitry. These terminals canoutput up to 285 mA. Refer to Figure 3 and Figure 4 on page 10 for the location of this pin.
Caution! The +5V terminals are outputs. Do not connect to an external power supply or you may damage
the USB-1208HS-2AO and possibly the computer.

GroundThe analog ground (AGND) connections provide a common ground for all analog I/O channels. The ground(GND) connections provide a common ground for the digital I/O, timer/counter I/O, timer, clock I/O, and the+5 V terminals.

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. Analog input specifications
Parameter

Condition

Specification

A/D converter
Input ranges

Software-selectable
per channel

Number of channels
Input configuration
Channel gain queue
Absolute maximum input
voltage
Input impedance
Input bandwidth (–3 dB)
Input leakage current
Input capacitance
Offset error drift
Gain error drift
Maximum working voltage(signal + common mode)
Sample rate
Sample clock source
Burst mode
Throughput
Resolution
A/D no missing codes(uncalibrated)
CMRR
Crosstalk

8 unique consecutive elements
CHx IN to GND

All input ranges

±20 V
±10 V
±5 V

Software paced
Scan to PC memory
Differential mode
Single-ended mode
60hz
SE mode, all ranges, 250 kHz
input signal
Differential mode, all ranges,
250 kHz input signal

16

Analog Devices AD7329
13-bit successive approximation type
 Differential: ±20 V, ±10 V, ±5 V (The voltage level oneach individual AIN input is limited to ±14 V.)
 SE: ±10 V, ±5 V, ±2.5 V, 0 V to 10 V
4 differential, 8 single-ended
Software-selectable
Multiplexed
Software-selectable range for each channel±25 V max (power on)±12 V max (power off)
35 MΩ min
2 MHz typ±250 nA typ
32 pf typ5 ppm/°C typ
25 ppm/°C typ
±14 V
±11 V
±5.5 V
1 S/s to 1 MS/s, software programmable
Internal A/D clock or AICKI
Software-selectable, burst rate = 1µs
33 S/s to 4000 S/s typ, system dependent
1 MS/s max
13 bits
13 bits
12 bits
74 dB typ–62 dB typ–78 dB typ

USB-1208HS-2AO User's Guide

Specifications

Table 2. Calibrated absolute accuracy
Range

Accuracy (mV)

±20 V (DIFF mode)±10 V (DIFF mode)±5 V (DIFF mode)±10 V (SE mode)±5 V (SE mode)±2.5 V (SE mode)0 – 10 V (SE mode)±9.55 typ, ±13.18 max±4.59 typ, ±6.23 max±2.25 typ, ±2.75 max±5.10 typ, ±8.06 max±2.63 typ, ±4.03 max±1.59 typ, ±2.70 max±3.29 typ, ±5.13 max

Table 3 summarizes the noise performance for the USB-1208HS-2AO. Noise distribution is determined bygathering 50 kS with inputs tied to ground at the user connector. Samples are gathered at the maximum
specified sample rate of 1 MS/s.
Table 3. Noise performance
Range

Typical counts

LSBrms±20 V (DIFF mode)±10 V (DIFF mode)±5 V (DIFF mode)±10 V (SE mode)±5 V (SE mode)±2.5 V (SE mode)0 – 10 V (SE mode)

3
3
3
5
5
5
5

0.45
0.45
0.45
0.91
0.91
0.91
0.91
Table 4. Input settling time in µs, typical

Condition

Range±1 LSB±4 LSB±8 LSB+ full-scale to –full-scalechannel switch, same range
to same range

±10 V
±5 V
±2.5 V
0 V to 10 V

1.5
2.1
2.2
2.6

1.1
1.1
1.1
1.1

1.0
1.0
1.0
1.0

17

USB-1208HS-2AO User's Guide

Specifications

Analog output
Table 5. Analog output specifications
Parameter
D/A converter
Number of channels
Resolution
Output range
Output transient
D/A update rate
Sample clock source
Monotonicity
Output current
Output short-circuit
protection
Output couplingPower up and reset stateOutput noise
Settling time (to 0.05%)
Absolute accuracy
Slew rate
Offset error drift
Gain error drift

Condition

Specification

Calibrated
Uncalibrated
Host PC is reset, powered on, suspended, ora reset command is issued to device.
Software paced
Hardware paced

Output connect to GND

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

Texas Instruments DAC7553
2 independent
12 bits±10 V±10.2 V
Duration: 3 ms typ
Amplitude: 6 V p-p typ
33 to 5000 S/s typ, system dependent
1 MHz max (per channel)
Internal D/A clock or AOCKI
12 bits±3 mA max per channel
Unlimited duration (10 mA typ)DC
0V
0.53 mV rms
5 µS max±0.1%
6.7 V/µs typ
10 ppm/°C typ
65 ppm/°C typ

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

Specification

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

CMOS
16
Each bit may be configured as input (power on default) or output
The port has 47 kΩ resistors configurable as pull-up or pull-down with an internal
jumper. The default setting is pull-down.
33 to 8000 port reads/writes or single bit reads/writes per second typ, system dependent.

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

Output high voltage
Output low voltage
Output current

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 = –24 mA)
0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 24 mA)±24 mA max per terminal (refer to Power section for additional information)18

USB-1208HS-2AO User's Guide

Specifications

External trigger
Table 7. External trigger specifications
Parameter

Specification

Trigger source
Trigger mode

TRIG input
Software-selectable 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 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

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

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

Specification

Terminal names
Terminal types

AICKI, AICKO, AOCKI, AOCKO
AxCKI: Input, active on rising edge
AxCKO: Output, power on default is 0 V, active on rising edge
AxCKI: Receives sampling clock from external source
AxCKO: Outputs the internal sampling clock (D/A or A/D clock) or pulse generated from
AxCKI when in external clock mode
1 MHz max
AxCKI: 400 ns min
AxCKO: 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 = –24 mA)
0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 24 mA)±24 mA max per terminal (refer to Power section for additional information)

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

19USB-1208HS-2AO User's Guide

Specifications

Counters
Table 9. Counter specifications
Parameter

Specification

Counter terminal names
Counter type
Number of channels
Input type
Schmitt trigger hysteresis
Input high voltage

CTR0, CTR1
Event counter2
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
32 bits
20 MHz33 to 8000 reads/writes per second typ, system dependent

Input low voltage

Resolution
Maximum input frequency
Counter read/write rates(software paced)High pulse width
Low pulse width

25 ns min
25 ns min

Timer
Table 10. Timer specifications
Parameter

Specification

Timer 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
40 MHz32 bits
20 ns min
20 ns min
4.4 V min (IOH = –50 µA)
3.76 V min (IOH = –24 mA)
0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 24 mA)±24 mA max per pin (refer to Power section for additional information)

Output low voltage
Output current

MemoryTable 11. Memory specifications
Parameter

Specification

Data FIFO
Non-volatile memory

4 kS analog input/4 kS analog output
32 KB (16 KB firmware storage, 16 KB calibration/user data)20

USB-1208HS-2AO User's Guide

Specifications

Power
Table 12. Power specifications
Parameter
Operating modes
Supply current(see Note 1)
Power consumption
excluding analog anddigital outputs
Power available for +5 V,
AICKO, AOCKO, TMR,
analog outputs, anddigital I/O
Digital output power
calculation
Analog output power
calculation+5 V output power
calculation+5 V output voltage
range (see Note 2)+5 V output current
Fuses

Condition

Specification

Suspend mode
Enumeration
Run mode
Run mode

Bus-powered, USB 5 V supply<2.5 mA<100 mA<500 mA
1.125 W max (225 mA input current)

Run mode

1.375 W max
The total power consumption for all external loads must be less than thisvalue, and each load must meet the individual specification for theterminal.
Power per output = Iout × 5 V(for example, @ 24 mA, P = 0.024 × 5 = 120 mW / output)
Power per output = (Iout × 16.5 V) / 0.78
(for example, @ 3 mA, P = (0.003 × 16.5) / 0.80 = 63.5 mW/output)
Power (W) = Iout × 5 V

Run mode
Suspend mode,
enumeration
Run mode, noother output loads
On USB supply

4.25 V min, 5.25 V max
0V
275 mA max (1.375 W)
0452.750 - Littelfuse 0.750A NANO2® Slo-Blo® Subminiature Surface
Mount Fuse.
Spare fuse mounted in holder on PCB.

Note 1: This is the total current consumption for the USB-1208HS-2AO, including +5 V, digital output andanalog output currents.
Note 2: Output voltage range assumes input power is within specified limits.

USB specifications
Table 13. USB specifications
Parameter

Specification

USB device typeUSB device compatibility
USB cable length
USB cable type

USB 2.0 (high-speed)
USB 1.1, 2.0
5 m (16.40 ft) max
A-B cable, UL type AWM 2725 or equivalent (min 24 AWG VBUS/GND,
min 28 AWG D+/D–).

Environmental
Table 14. Environmental specifications
Parameter

Specification

Operating temperature
range
Storage temperature
range
Humidity

0 °C to 50 °C–40 °C to 85 °C
0% to 90% non-condensing

21

USB-1208HS-2AO User's Guide

Specifications

Mechanical
Table 15. Mechanical specifications
Parameter

Specification

Dimensions (L × W × H)

5.00 × 3.53 × 1.40 in. (127 × 89.9 × 35.6 mm)

Screw terminal connector and pinout
Table 16. Connector specifications
Parameter

Specification

Connector type
Wire gauge range

Screw terminal
16 AWG to 30 AWG
Table 17. 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
28

Signal name
AIN0
AGND
AIN1
AGND
AIN2
AGND
AIN3
AGND
AIN4
AGND
AIN5
AGND
AIN6
AGND
AIN7
AGND
empty
+5V
GND
DIO0
DIO1
DIO2
DIO3
DIO4
DIO5
DIO6
DIO7
GND

Pin
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
55
56

22

Signal name
AOUT0
AOUT1
AGND
NC
NC
AGND
AICKI
AICKO
AOCKI
AOCKO
TRIG
GND
CTR0
CTR1
TMR
GND
empty
+5V
GND
DIO8
DIO9
DIO10
DIO11
DIO12
DIO13
DIO14
DIO15
GND

USB-1208HS-2AO User's Guide

Specifications

Table 18. 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
28

Signal name
AIN0 +AGND
AIN0 AGND
AIN1 +AGND
AIN1 AGND
AIN2 +AGND
AIN2 AGND
AIN3 +AGND
AIN3 AGND
empty
+5V
GND
DIO0
DIO1
DIO2
DIO3
DIO4
DIO5
DIO6
DIO7
GND

Pin
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
55
56

23

Signal name
AOUT0
AOUT1
AGND
NC
NC
AGND
AICKI
AICKO
AOCKI
AOCKO
TRIG
GND
CTR0
CTR1
TMR
GND
empty
+5V
GND
DIO8
DIO9
DIO10
DIO11
DIO12
DIO13
DIO14
DIO15
GND

Declaration of Conformity
Manufacturer:
Address:

Category:

Measurement Computing Corporation
10 Commerce Way
Suite 1008
Norton, MA 02766
USAElectrical equipment for measurement, control and laboratory use.

Measurement Computing Corporation declares under sole responsibility that the products

USB-1208HS-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
December, 2008. Test records are outlined in Chomerics Test Report #EMI5217.08.
We hereby declare that the equipment specified conforms to the above Directives and Standards.

Carl Haapaoja, Director of Quality Assurance

24Measurement Computing Corporation
10 Commerce Way
Suite 1008
Norton, Massachusetts 02766(508) 946-5100
Fax: (508) 946-9500
E-mail: info@mccdaq.com
www.mccdaq.com