USB-1208HS-4AO User`s Guide
USB-1208HS-4AO
High-Speed Analog Input and Digital I/O
User's Guide
Document Revision 3
March 2013
© Copyright 2013
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HM USB-1208HS-4AO.docx
2
Table of Contents
Preface
About this Manual ................................................................................................................................. 5
Conventions ........................................................................................................................................................ 5
Where to find more information ......................................................................................................................... 5
Chapter 1
Installing the USB-1208HS-4AO .......................................................................................................... 6
Functional block diagram ................................................................................................................................... 6
Chapter 2
Installing the USB-1208HS-4AO .......................................................................................................... 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-4AO .................................................................................................................... 8
Chapter 3
Functional Details ................................................................................................................................. 9
Analog input acquisition modes ......................................................................................................................... 9
Software paced mode ........................................................................................................................................................ 9
Hardware paced mode....................................................................................................................................................... 9
External components .......................................................................................................................................... 9
USB connector .................................................................................................................................................................10
Activity LED ...................................................................................................................................................................10
Status LED .......................................................................................................................................................................10
Screw terminals................................................................................................................................................................10
Signal connections ............................................................................................................................................ 10
Analog input ....................................................................................................................................................................10
Analog output ..................................................................................................................................................................12
External clock I/O ............................................................................................................................................................12
Digital I/O ........................................................................................................................................................................12
Counter input .................................................................................................................................................... 14
Timer output ..................................................................................................................................................... 14
Trigger input ..................................................................................................................................................... 14
Retrigger ..........................................................................................................................................................................14
Power output ..................................................................................................................................................... 14
Ground .............................................................................................................................................................. 14
Chapter 4
Specifications ......................................................................................................................................15
Analog input ..................................................................................................................................................... 15
Analog output (USB-1208HS-2AO, USB-1208HS-4AO) ............................................................................... 17
Digital input/output........................................................................................................................................... 17
External trigger ................................................................................................................................................. 18
External clock input/output............................................................................................................................... 18
Counters ............................................................................................................................................................ 19
Timer ................................................................................................................................................................ 19
Memory ............................................................................................................................................................ 19
3
USB-1208HS-4AO User's Guide
Power ................................................................................................................................................................ 20
USB specifications ........................................................................................................................................... 20
Environmental .................................................................................................................................................. 21
Mechanical ....................................................................................................................................................... 21
Screw terminal connector and pinout ............................................................................................................... 21
Declaration of Conformity ..................................................................................................................23
4
Preface
About this Manual
This document describes the USB-1208HS-4AO 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-4AO 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
Installing the USB-1208HS-4AO
The USB-1208HS-4AO is a high-speed analog input and digital I/O data acquisition device providing the
following features:









Eight 16-bit single-ended (SE) or four differential (DIFF) analog inputs
Each input channel has a dedicated multiplexed 13-bit A/D converter for simultaneous sampling.
Four 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 lets 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-4AO is a USB 2.0 high-speed device supported under popular Microsoft® Windows®
operating systems. The USB-1208HS-4AO 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-4AO functions are illustrated in the block diagram shown here.
Figure 1. USB-1208HS-4AO functional block diagram
6
Chapter 2
Installing the USB-1208HS-4AO
What comes with your shipment?
The following items are shipped with the USB-1208HS-4AO:
Hardware


USB-1208HS-4AO
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 installing
the software. Please read this booklet completely before installing any software or hardware.
Unpacking
As with any electronic device, take care while handling to avoid damage from static electricity. Before
removing the USB-1208HS-4AO from its packaging, ground yourself using a wrist strap or touch either the
computer 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 is
available 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 the
software before you install your board. Refer to the Quick Start Guide for instructions.
To connect the USB-1208HS-4AO 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 power
and communication to the USB-1208HS-4AO.
When you connect the USB-1208HS-4AO for the first time, a Found New Hardware dialog opens when the
operating system detects the device. The Status LED turns on; this indicates that communication is established
between 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-4AO User's Guide
Installing the USB-1208HS-4AO
Caution! Do not disconnect any device from the USB bus while the computer is communicating with the
device, or you may lose data and/or your ability to communicate with the USB-1208HS-4AO..
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-4AO
The USB-1208HS-4AO is shipped fully calibrated. Calibration coefficients are stored in EEPROM.
Return the device to Measurement Computing Corporation when calibration is required. The normal calibration
interval is once per year.
8
Chapter 3
Functional Details
Analog input acquisition modes
The USB-1208HS-4AO 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 by
calling 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 to
4000 S/s.
Hardware paced mode
You can acquire data from up to eight channels in continuous scan mode. The analog data is continuously
acquired, converted to digital values, and written to an onboard FIFO buffer on the device until you stop the
scan. The FIFO buffer is serviced in blocks as the data is transferred from the USB-1208HS-4AO FIFO buffer
to the memory buffer on your computer.
The maximum sampling rate is 1 MS/s aggregate over one-to-eight channels. You can start a continuous scan
with either a software command or with an external hardware trigger event.
External components
The USB-1208HS-4AO 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 connector
USB connector
Figure 2. External components
9
USB-1208HS-4AO 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-4AO. It blinks when data is
transferred, 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.
Screw terminals
Screw terminal connections are shown in shown in Figure 3.
Figure 3. USB-1208HS-4AO screw terminal signals
Use 16 AWG to 30 AWG for signal connections.
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.
10
USB-1208HS-4AO User's Guide


Functional Details
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 #
0
1
2
3
4
5
6
7
8 single-ended channels configuration 0
Vin+
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
Vin–
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
4 differential channels configuration
Vin+
AIN0
AIN2
AIN4
AIN6
-
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, the
input voltage ranges are ±20 V, ±10 V, and ±5 V. The voltage level on each AINx input is limited to ±14 V
The following image depicts a voltage source connected to a USB-1208HS-4AO configured for SE mode.
Figure 4. Single-ended measurement connection
The following image depicts a Wheatstone bridge signal source connected to a USB-1208HS-4AO configured
for DIFF mode.
Figure 5. 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 is
available on our web site at www.mccdaq.com/signals/signals.pdf).
11
USB-1208HS-4AO User's Guide
Functional Details
Analog output
You can connect up to four analog output connections to screw terminals AOUT0 to AOUT3. Refer to the pinout
diagram 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-4AO has a fixed ±10 V output range. The outputs default to 0 V at
power up.
External clock I/O
The USB-1208HS-4AO 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.
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 the
pulse generated from AOCKI
When using the internal clock, AICKO outputs the ADC scan clock, and AOCKO outputs the DAC scan
clock.
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 is
pull-down.
You can use the digital I/O terminals to detect the state of any TTL-level input. Refer to the schematic in Figure
6. 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 6. Schematic showing switch detection by digital channel DIO0
Pull-up/down configuration
Each of the 16 DIO bits on the USB-1208HS-4AO has a 47 kΩ pull-up/pull-down resistor. To configure these
bits for either a +5 V pull-up or a 0 V pull-down option, you must open the USB-1208HS-4AO case to access
the three-pin jumper labeled W34.
The pull-up/pull-down voltage is common to all of the internal 47 kΩ resistors.
To open the case and set the W34 jumper, do the following.
1.
Turn over the USB-1208HS-4AO 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 7 from the bottom of the device.
12
USB-1208HS-4AO User's Guide
Functional Details
Figure 7. Location of screws connecting bottom and top sections of case
4.
Holding both the top and bottom sections of the module, turn it back over, rest it on the surface, and
carefully remove the top section of the case.
5.
Set the jumper to either pull-up or pull-down (see Figure 8 and Figure 9).
Figure 8. Location of W34 jumper (default pull-down setting shown)
Figure 9. 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).
13
USB-1208HS-4AO User's Guide
Functional Details
Counter input
CTR0 and CTR1 provide connections to each 32-bit counter input channel (CTR0 and CTR1). Each counter can
count frequencies of 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 enabled
resting 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.
Both the period and time delay ranges are 50 ns to 107.4 seconds.
Figure 10. USB-1208HS-4AO 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 activated
Power output
You can use the two +5V connections to supply power to external devices or circuitry. These terminals can
output up to 285 mA. Refer to the pinout diagram 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-4AO and possibly the computer.
Ground
The 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.
14
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)
Sampling 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
15
Analog Devices AD7329
13-bit successive approximation type
 Differential: ±20 V, ±10 V, ±5 V (The voltage level on
each 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 typ
5 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-4AO 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 USB-1208HS Series hardware. Noise distribution is determined
by gathering 50 kS with inputs tied to ground at the user connector. Samples are gathered at the maximum
specified sampling 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-scale
channel 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
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USB-1208HS-4AO User's Guide
Specifications
Analog output (USB-1208HS-2AO, USB-1208HS-4AO)
Table 5. Analog output specifications
Parameter
Condition
Specification
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 coupling
Power up and reset state
Output noise
Settling time (to 0.05%)
Absolute accuracy
Slew rate
Offset error drift
Gain error drift
Calibrated
Uncalibrated
Host PC is reset, powered on, suspended, or
a 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
USB-1208HS-2AO:
2 independent
USB-1208HS-4AO:
4 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 (see "Power"section for additional information)
17
USB-1208HS-4AO 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
USB-1208HS:
AICKI, AICKO
USB-1208HS-2AO:
AICKI, AICKO, AOCKI, AOCKO
USB-1208HS-4AO:
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 D/A clock, if
supported) 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 (see "Power" section for additional information)
Terminal types
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
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USB-1208HS-4AO 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 counter
2
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 MHz
33 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 name
Timer type
Output 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 MHz
32 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 (see "Power" section for additional information)
Output low voltage
Output current
Memory
Table 11. Memory specifications
Parameter
Specification
Data FIFO
USB-1208HS:
4 kS analog input
USB-1208HS-2AO:
4 kS analog input/4 kS analog output
USB-1208HS-4AO:
4 kS analog input/4 kS analog output
32 KB (16 KB firmware storage, 16 KB calibration/user data)
Non-volatile memory
19
USB-1208HS-4AO User's Guide
Specifications
Power
Table 12. Power specifications
Parameter
Operating modes
Supply current
(see Note 1)
Power consumption
excluding analog and
digital outputs
Power available for +5 V,
AICKO, AOCKO, TMR,
analog outputs, and
digital I/O
Digital output power
calculation
Analog output power
calculation
(USB-1208HS-2AO/
USB-1208HS-4AO)
+5 V output power
calculation
+5 V output voltage
range (see Note 2)
+5 V output current
Fuses
Condition
Specification
Bus-powered, USB 5 V supply
<2.5 mA
<100 mA
<500 mA
USB-1208HS:
1.05 W max (210 mA input current)
USB-1208HS-2AO:
1.125 W max (225 mA input current)
USB-1208HS-4AO:
1.175 W max (235 mA input current)
USB-1208HS:
1.45 W max
USB-1208HS-2AO:
1.375 W max
USB-1208HS-4AO:
1.325 W max
The total power consumption for all external loads must be less than this
value, and each load must meet the individual specification for the
terminal.
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)
Suspend mode
Enumeration
Run mode
Run mode
Run mode
Power (W) = Iout × 5 V
Run mode
Suspend mode,
enumeration
Run mode, no
other output loads
On USB supply
4.25 V min, 5.25 V max
0V
USB-1208HS:
290 mA max (1.45 W)
USB-1208HS-2AO:
275 mA max (1.375 W)
USB-1208HS-4AO:
265 mA max (1.325 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 USB-1208HS Series hardware, including +5 V, digital output
and analog output currents (if supported).
Note 2: Output voltage range assumes input power is within specified limits.
USB specifications
Table 13. USB specifications
Parameter
Specification
USB device type
USB 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–).
20
USB-1208HS-4AO User's Guide
Specifications
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
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
21
Signal name
AOUT01
AOUT11
AGND
AOUT22
AOUT32
AGND
AICKI
AICKO
AOCKI3
AOCKO3
TRIG
GND
CTR0
CTR1
TMR
GND
empty
+5V
GND
DIO8
DIO9
DIO10
DIO11
DIO12
DIO13
DIO14
DIO15
GND
USB-1208HS-4AO User's Guide
Specifications
1
USB-1208HS-2AO and USB-1208HS-4AO only; NC (no connection) on the USB-1208HS.
2
USB-1208HS-4AO only; NC (no connection) on the USB-1208HS AND USB-1208HS-2AO.
3
USB-1208HS-2AO and USB-1208HS-4AO only; NC (no connection) on the USB-1208HS.
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
Signal name
AOUT01
AOUT11
AGND
AOUT22
AOUT32
AGND
AICKI
AICKO
AOCKI3
AOCKO3
TRIG
GND
CTR0
CTR1
TMR
GND
empty
+5V
GND
DIO8
DIO9
DIO10
DIO11
DIO12
DIO13
DIO14
DIO15
GND
1
USB-1208HS-2AO and USB-1208HS-4AO only; NC (no connection) on the USB-1208HS.
2
USB-1208HS-4AO only; NC (no connection) on the USB-1208HS AND USB-1208HS-2AO.
3
USB-1208HS-2AO and USB-1208HS-4AO only; NC (no connection) on the USB-1208HS.
22
Declaration of Conformity
Manufacturer:
Address:
Category:
Measurement Computing Corporation
10 Commerce Way
Suite 1008
Norton, MA 02766
USA
Electrical equipment for measurement, control and laboratory use.
Measurement Computing Corporation declares under sole responsibility that the products
USB-1208HS-4AO
to which this declaration relates is in conformity with the relevant provisions of the following standards or other
documents:
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
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
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