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USB-1608FS

Analog Input and Digital I/O

User's Guide

Document Revision 7A

January 2014

© Copyright 2014

Trademark and Copyright Information

Measurement Computing Corporation, InstaCal, Universal Library, and the Measurement Computing logo are either trademarks or registered trademarks of Measurement Computing Corporation. Refer to the Copyrights &

Trademarks section on mccdaq.com/legal for more information about Measurement Computing trademarks.

Other product and company names mentioned herein are trademarks or trade names of their respective companies.

© 2014 Measurement Computing Corporation. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form by any means, electronic, mechanical, by photocopying, recording, or otherwise without the prior written permission of Measurement Computing

Corporation.

Notice

Measurement Computing Corporation does not authorize any Measurement Computing Corporation product for use in life support systems and/or devices without prior written consent from Measurement Computing

Corporation. Life support devices/systems are devices or systems that, a) are intended for surgical implantation into the body, or b) support or sustain life and whose failure to perform can be reasonably expected to result in injury. Measurement Computing Corporation products are not designed with the components required, and are not subject to the testing required to ensure a level of reliability suitable for the treatment and diagnosis of people.

HM USB-1608FS

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-1608FS................................................................................................................ 6

Functional block diagram ................................................................................................................................... 6

Chapter 2

Installing the USB-1608FS.................................................................................................................... 7

What comes with your USB-1608FS shipment? ................................................................................................ 7

Hardware .......................................................................................................................................................................... 7

Software ............................................................................................................................................................................ 7

Documentation .................................................................................................................................................................. 7

Unpacking........................................................................................................................................................... 7

Installing the software ........................................................................................................................................ 7

Installing the hardware ....................................................................................................................................... 7

Calibrating the hardware..................................................................................................................................... 8

Chapter 3

Functional Details ................................................................................................................................. 9

Analog input acquisition modes ......................................................................................................................... 9

Software paced .................................................................................................................................................................. 9

Hardware paced ................................................................................................................................................................ 9

BURSTIO ......................................................................................................................................................................... 9

External components ........................................................................................................................................ 10

USB connector .................................................................................................................................................................10

LED .................................................................................................................................................................................10

Screw terminals................................................................................................................................................................10

Signal connections ............................................................................................................................................ 11

Analog input ....................................................................................................................................................................11

Channel-Gain queue ........................................................................................................................................................12

Digital I/O ........................................................................................................................................................................12

Pull-up/down configuration .............................................................................................................................................12

Counter input ...................................................................................................................................................................13

Trigger input ....................................................................................................................................................................13

SYNC I/O ........................................................................................................................................................................13

Calibration output ............................................................................................................................................................13

Ground .............................................................................................................................................................................14

Power output ....................................................................................................................................................................14

Accuracy ........................................................................................................................................................... 14

Synchronized operations ................................................................................................................................... 17

Mechanical drawings ........................................................................................................................................ 18

Chapter 4

Specifications ...................................................................................................................................... 19

Analog input ..................................................................................................................................................... 19

Digital I/O ......................................................................................................................................................... 20

External trigger ................................................................................................................................................. 21

External clock input/output............................................................................................................................... 21

Counter ............................................................................................................................................................. 22

Memory ............................................................................................................................................................ 22

3

USB-1608FS User's Guide

Microcontroller ................................................................................................................................................. 22

Power ................................................................................................................................................................ 23

General ............................................................................................................................................................. 23

Environmental .................................................................................................................................................. 23

Mechanical ....................................................................................................................................................... 23

Screw terminal connector and pinout ............................................................................................................... 23

Declaration of Conformity .................................................................................................................. 25

4

Preface

About this User's Guide

What you will learn from this user's guide

This user's guide describes the Measurement Computing USB-1608FS 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 are reading.

Caution! Shaded caution statements present information to help you avoid injuring yourself and others, damaging your hardware, or losing your data.

bold text

italic text

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

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

Where to find more information

For additional information relevant to the operation of your hardware, refer to the Documents subdirectory where you installed the MCC DAQ software (C:\Program Files\Measurement Computing\DAQ by default), or search for your device on our website at www.mccdaq.com

.

5

Chapter 1

Introducing the USB-1608FS

The USB-1608FS is an analog input and digital I/O data acquisition device providing the following features:

Eight 16-bit single-ended (SE) analog input channels

Each input channel has a dedicated A/D converter for simultaneous sampling.

Software-selectable analog input ranges of ±10 V, ±5 V, ±2 V, and ±1 V

Eight individually configurable digital I/O channels

One 32-bit event counter

One external digital trigger input

Bidirectional external clock for synchronous operations with a second device.

Screw terminals for field wiring connections

The device is powered by the +5V USB supply from the computer, and requires no external power.

The USB-1608FS is a full-speed device that is compatible with both USB 1.1 and USB 2.0 ports. The speed of the device may be limited 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-1608FS functions are illustrated in the block diagram shown here.

Figure 1. Functional block diagram

6

Chapter 2

Installing the USB-1608FS

What comes with your USB-1608FS shipment?

The following items are shipped with the USB-1608FS.

Hardware

USB-1608FS

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-1608FS 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 installing the device, run Windows Update to update your operating system with the latest HID and USB drivers.

To connect the USB-1608FS to your system, connect the USB cable to a USB port on your computer or to an external USB hub that is connected to your computer.

The USB-1608FS installs as a composite device with separate devices attached. When you connect the device for the first time, a

Found New Hardware

dialog opens as each device interface is detected. This is normal.

After the device is installed its LED will blink and then remain on. This indicates that communication is established between the USB-1608FS and your computer.

7

USB-1608FS User's Guide

If the LED turns off

If communication is lost between the device and the computer, the device LED turns off. Disconnect the USB cable from the computer and then reconnect it. This should restore communication, and the LED should turn on.

Calibrating the hardware

You can calibrate the USB-1608FS with InstaCal. Perform calibration whenever the ambient temperature changes by more than ±10 °C from the last calibration.

The Measurement Computing Manufacturing Test department performs the initial factory calibration. Contact

Measurement Computing if you want to have the factory calibration coefficients restored.

8

Chapter 3

Functional Details

Analog input acquisition modes

The USB-1608FS can acquire analog input data in three modes – software paced, hardware paced, and

BURSTIO.

Software paced

The USB-1608FS acquires data one analog sample at a time using software-paced mode. You initiate the A/D conversion by calling a software command. The analog value is converted to digital and returned to the computer. You can repeat this procedure until you have the total number of samples that you want.

The USB-1608FS can attain throughput rates up to 500 S/s using a software loop. This rate is systemdependent.

Hardware paced

The USB-1608FS can acquire data from up to eight channels simultaneously in hardware-paced mode. The analog data is acquired, converted to digital values, and written to an onboard FIFO buffer on the USB-1608FS until you stop the scan. Data is transferred from the USB-1608FS FIFO buffer to the memory buffer on your computer.

The A/D converter is paced by either an internal or external clock source.

The maximum sample rate is an aggregate rate. The total sample rate for all channels is 100 kS/s divided by the number of channels, with a maximum rate of 50 kS/s for any channel. Using this equation, the USB-1608FS can acquire data from one channel at 50 kS/s, two channels at 50 kS/s each, four channels at 25 kS/s each, and so on, up to eight channels at 12.5 kS/s each. You start a hardware-paced scan with a software command.

Optionally, hardware-paced scans can be delayed by an external hardware trigger event.

BURSTIO

When using BURSTIO, the USB-1608FS can acquire data at higher rates using the full capacity of the

32 kilosample FIFO. The acquired data is then read from the FIFO and transferred to a user buffer in the computer after the acquisition is complete. You can initiate a single acquisition sequence of one, two, four, or eight channels with a software command. Optionally, BURSTIO scans can be delayed by an external hardware trigger event.

When BURSTIO is enabled, the number of samples acquired in a scan is limited to the depth of the onboard memory. The maximum sample rate in BURSTIO mode is an aggregate rate is 200 kS/s. The maximum sample rate for all channels is 200 kS/s divided by the number of channels, with a maximum rate of 50 kS/s for any channel.

The maximum sample rate that you can acquire data using BURSTIO is 50 kS/s each for one, two, or four channels, and 25 kS/s each for eight channels.

9

USB-1608FS User's Guide

External components

The external components – screw terminal banks, LED, and USB connector –are shown in Figure 2.

1 Screw terminal pins 21 to 40 3 Screw terminal pins 1 to 20

2 LED 4 USB connector

Figure 2. USB-1608FS components

USB connector

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

LED

The LED indicates the communication status; it cannot be disabled. LED states are listed in the table below.

LED behavior

LED state

On – steady green

Blinks once

Blinks continuously

Blinks three times

Blinks at a slow rate

Indication

The device is connected to a computer or external USB hub.

A USB command is received.

Data is being transferred.

Initial communication is established between the USB-1608FS and the computer.

The analog input is configured for external trigger. The LED stops blinking and illuminates steady green when the trigger is received.

Screw terminals

The screw terminals provide the following connections:

Eight analog inputs (

CH0 IN

to

CH7 IN

)

Eight digital I/O lines(

DIO0

to

DIO7

)

One external event counter input (

CTR

)

One SYNC I/O terminal for external clocking and multi-unit synchronization (

SYNC

)

One external trigger input (

TRIG_IN

)

One calibration output (

CAL

)

One power output (

PC +5 V

)

 analog ground (

AGND

) and digital ground (

GND

) connections

10

USB-1608FS User's Guide

Use 16 AWG to 30 AWG wire when making connections to the screw terminals. Pinout locations are shown in

Figure 3 below.

Figure 3. Screw terminal pinout

Signal connections

Analog input

You can connect up to eight analog input connections to

CH0 IN

through

CH7 IN

. Connect unused analog input terminals to ground terminals during operation. For example, if you are not using terminal 15 (

CH7 IN

), connect this terminal to terminal 16 (

AGND

).

The analog input channels are configured for single-ended input mode. Each analog signal is referenced to signal ground (AGND), and requires two wires:

Connect the wire carrying the signal to be measured to

CH# IN

.

Connect the second wire to

AGND

.

The input voltage ranges are ±10 V, ±5 V, ±2.0 V, ±1.0 V.

For more information on analog signal connections

For more information on single-ended inputs, refer to the Guide to Signal Connections (this document is available on our web site at www.mccdaq.com/signals/signals.pdf

).

11

USB-1608FS User's Guide

Channel-Gain queue

The channel-gain queue feature allows you to configure a different gain setting for each analog input channel.

The gain settings are stored in a channel-gain queue list that is written to local memory on the device.

The channel-gain queue list must contain all eight channels listed in consecutive order. An example of the channel-gain queue list is shown in the table below.

Sample channel-gain queue list

Element

0

1

2

3

4

5

6

7

Channel

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

Range

BIP10V

BIP5V

BIP10V

BIP1V

BIP2V

BIP10V

BIP1V

BIP5V

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

Digital I/O

You can connect up to eight digital I/O lines to

DIO0

through

DIO7

. Each digital channel is individually configurable for input or output. During initial power on or reset the digital pins are set for input.

The digital I/O terminals can detect the state of any TTL-level input. Refer to the schematic shown in Figure 4.

Figure 4. Schematic showing switch detection by digital channel DIO0

If you set the switch to the +5 V input, DIO0 reads TRUE (1). When set to GND, DIO0 reads FALSE (0).

Pull-up/down configuration

Boards designed with hardware revision E and later have a user-configurable internal jumper to configure the digital bits for pull-up (default) or pull-down. The hardware revision is listed with the part number on the bottom of the device, for example P/N 193334E.

If the p/n of your board is earlier than hardware revision E, the default configuration is pull-up. To configure for pull-down, the board must be modified at the factory.

If your board has a user-configurable jumper, complete the following steps to set the pull-up/down configuration:

1.

Unplug the device from the computer.

2.

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

Caution! The discharge of static electricity can damage some electronic components. Before removing the

USB-1608FS from its housing, ground yourself using a wrist strap or touch the computer chassis or other grounded object to eliminate any stored static charge.

3.

Remove the three screws from the bottom of the device using a #1 Philips head screwdriver.

4.

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

12

USB-1608FS User's Guide

The user-configurable jumper is labeled

DIO

. Figure 5 shows the location of the jumper on the circuit

board.

Figure 5. Pull-up/down jumper location

5.

Configure the jumper for pull-up or pull-down, as shown in Figure 6.

Figure 6. Pull-up/down jumper configuration

6.

Replace the top section of the housing, and fasten it to the bottom section with the three 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

Signal Connections (available on our web site at www.mccdaq.com/signals/signals.pdf

).

Counter input

The

CTR

terminal is a 32-bit event counter that can accept frequency inputs up to 1 MHz. The internal counter increments when the TTL levels transition from low to high.

Trigger input

The

TRIG_IN

terminal is an external digital trigger input. The trigger mode is set for edge sensitive, and is configurable for rising or falling edge. On power up and reset the trigger mode is set for rising edge.

SYNC I/O

The

SYNC

terminal is a bidirectional I/O signal that can be configured as an input (default) or an output.

Configure as an external clock input to externally source the A/D conversions. The SYNC terminal supports TTL-level input signals of up to 50 kHz.

Configure as an output to pace conversions on a second USB-1608FS device and acquire data from

16 channels. For more information about synchronized operations see page 17.

Calibration output

The

CAL

terminal is an output that is used to calibrate the USB-1608FS. Do not use this pin for any other purpose. Calibration is software-controlled by InstaCal.

13

USB-1608FS User's Guide

Ground

The analog ground (

AGND

) terminals provide a common ground for all analog channels.

The digital ground (

GND

) terminals provide a common ground for the digital, trigger, counter, sync and power terminals.

Power output

The

PC +5V

terminal is a 5 volt output that is supplied by the computer. You can use this terminal to supply power to external devices or circuitry.

Caution! The PC +5V terminal is an output. Do not connect to an external power supply or you may damage the USB-1608FS and possibly the computer.

The maximum total output current that can be drawn from all USB-1608FS connections (power, analog, and digital outputs) is 500 mA. This maximum applies to most personal computers and self-powered USB hubs.

Bus-powered hubs and notebook computers may limit the maximum available output current to 100 mA.

Note

:

If the current requirement of the device exceeds the current available from the computer, connect to a selfpowered hub or power the computer with an external power adapter.

The USB-1608FS can draw up to 150 mA max of current from the USB +5V supply. When running applications with the device, each DIO bit can source up to 2.5 mA. With all outputs at their maximum output current, the total current requirement of the

PC +5V

terminal is calculated as follows:

Total current requirement = (USB-1608FS @ 150 mA) + (8 DIO @ 2.5 mA ea) = 170 mA

The maximum available excess current is the difference between the allowed current draw of the computer platform and the total output current requirement of the device. For an application running on a computer or powered hub, the maximum available excess current is calculated as follows:

Maximum excess current = 500 mA – 170 mA = 330 mA

Measurement Computing highly recommends that you figure in a safety factor of 20% below this maximum current loading for your applications. A conservative, safe user maximum in this case would be in the 250 mA to 300 mA range.

Accuracy

The overall accuracy of any instrument is limited by the error components within the system. Resolution is often used incorrectly to quantify the performance of a measurement product. While "16-bits" or "1 part in

65,536" does indicate what can be resolved, it provides little insight into the quality, or accuracy, of an absolute measurement. Accuracy specifications describe the actual measurement achievable with a USB-1608FS.

There are three types of errors which affect the accuracy of a measurement system:

offset

gain

nonlinearity

The primary error sources in the USB-1608FS are offset and gain. Nonlinearity is small, and is not significant as an error source with respect to offset and gain.

14

USB-1608FS User's Guide

Figure 7 shows an ideal, error-free, USB-1608FS transfer function. The typical calibrated accuracy of the

USB-1608FS is range-dependent, as explained in the " Specifications " chapter. We use a ±10 V range as an

example of what you can expect when performing a measurement in this range.

Figure 7. Ideal ADC transfer function

The USB-1608FS offset error is measured at mid-scale. Ideally, a zero volt input should produce an output code

of 32768. Any deviation from this is an offset error. Figure 8 shows the USB-1608FS transfer function with an

offset error. The typical offset error specification for the USB-1608FS on the ±10 V range is ±1.66 mV. Offset error affects all codes equally by shifting the entire transfer function up or down along the input voltage axis.

The accuracy plots in Figure 8 are drawn for clarity and are not drawn to scale.

Figure 8. ADC transfer function with offset error

Gain error is a change in the slope of the transfer function from the ideal, and is typically expressed as a

percentage of full-scale. Figure 9 shows the USB-1608FS transfer function with gain error. Gain error is easily

converted to voltage by multiplying the full-scale input (±10 V) by the error.

The accuracy plots in Figure 9 are drawn for clarity and are not drawn to scale.

15

USB-1608FS User's Guide

Figure 9. ADC Transfer function with gain error

For example, the USB-1608FS exhibits a typical calibrated gain error of ±0.04% on all ranges. For the ±10 V range, this would yield 10 V × ±0.0002 = ±4 mV. This means that at full scale, neglecting the effect of offset for the moment, the measurement would be within 4 mV of the actual value. Note that gain error is expressed as a ratio. Values near ±FS (±10 V) are more affected from an absolute voltage standpoint than are values near midscale, which see little or no voltage error.

Combining these two error sources in Figure 10, we have a plot of the error band of the USB-1608FS at ±full

scale (±10 V). This plot is a graphical version of the typical accuracy specification of the product.

The accuracy plots in Figure 10 are drawn for clarity and are not drawn to scale.

Figure 10. Error band plot

16

USB-1608FS User's Guide

Synchronized operations

You can run up to two USB-1608FS devices on most computers. You can connect the SYNC pin of two devices together in a master/slave configuration and acquire data from the analog inputs of both devices using one clock. When the SYNC pin is configured as an output, the internal A/D pacer clock signal is sent to the screw terminal. You can output the clock to the SYNC pin of a second device that is configured for A/D pacer input.

Change to SYNC pin setting not implemented until first scan

When you change the setting of the SYNC pin to input or to output using InstaCal, the change does not take place until you run a scan with a USB-1608FS.

Consequently, if you change the SYNC pin from output to input, the SYNC pin remains an output, and connections to this pin are connections to an output until the first scan runs. This will not damage the

USB-1608FS.

To update the SYNC pin setting before connecting to the SYNC pin, run the InstaCal analog

Scan Test

.

17

USB-1608FS User's Guide

Mechanical drawings

Figure 11. Circuit board (top) and enclosure dimensions

18

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 type

Number of channels

Input ranges

Sampling rate

Throughput

Input configuration

Sampling method

Absolute maximum input voltage CHx IN to GND

Input impedance

Software-selectable

Scan to PC memory

Burst scan to 32 k sample FIFO

Software paced

Hardware paced (Note 1)

Gain queue

Resolution

No missing codes

Crosstalk

CAL output

CAL output accuracy (Note 2)

CAL current

Trigger source

BURSTIO

≤ 32,768 total samples

(uses onboard FIFO)

Signal DC to 25 kHz

User calibration source

Software-selectable

16-bit successive approximation type

8 single-ended

Individual A/D per channel

Simultaneous

±15 V max

100 M

Ω, min

±10 V, ±5 V, ±2 V, ±1 V

0.6 S/s to 50 kS/s, software-selectable

20 S/s to 50 kS/s, software- selectable

500 S/s all channels

(100 kS/s) / (# of channels),

50 kS/s max for any channel

(200 kS/s) / (# of channels),

50 kS/s max for any channel

Software configurable..

Eight unique, consecutive elements – one gain element per channel.

16 bits

15 bits

–80 dB

0.625 V, 1.25 V, 2.5 V, 5.0 V, software-selectable

±0.5% typ, ±1.0% max

±5 mA max

External digital: TRIG_IN

Note 1:

Maximum throughput when scanning in hardware paced mode is machine dependent.

Note 2:

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

Table 2. Calibrated absolute accuracy

Range

±10 V

±5 V

±2 V

±1 V

Accuracy (mV)

5.66

2.98

1.31

0.68

19

USB-1608FS User's Guide

Range

±10 V

±5 V

±2 V

±1 V

Table 3. Accuracy components - All values are (±)

% of Reading

0.04

0.04

0.04

0.04

Gain error at FS (mV)

4.00

2.00

0.80

0.40

Offset (mV)

1.66

0.98

0.51

0.28

Table 4 summarizes the noise performance for the USB-1608FS. Noise distribution is determined by gathering

50 k samples with inputs tied to ground at the user connector. Samples are gathered at the maximum specified sampling rate of 50 kS/s.

Table 4. Noise performance

Range

±10 V

±5 V

±2 V

±1 V

Typical counts

10

10

11

14

LSBrms

1.52

1.52

1.67

2.12

Digital I/O

Table 5. Digital I/O specifications

Parameter Specification

Digital type

Number of I/O

CMOS

8 (DIO0 through DIO7)

Configuration Independently configured for input or output

Pull-up/pull-down configuration All pins pulled up to 5V via 47 k

Ω resistors (default).

Hardware revisions E and later may be changed to pull-down using an internal user-configurable jumper.

Previous revisions can be configured for pull-down at the factory.

Input high voltage threshold 2.0 V min

Input high voltage limit

Input low voltage threshold

Input low voltage limit

5.5 V absolute max

0.8 V max

–0.5 V absolute min

0 V recommended min

3.8 V min Output high voltage

(IOH = –2.5 mA)

Output low voltage

(IOL = 2.5 mA)

Power on and reset state

0.44 V max

Input

20

USB-1608FS User's Guide

External trigger

Parameter

Trigger source

Trigger mode

Trigger latency

Trigger pulse width

Input type

Schmitt trigger hysteresis

Input high voltage threshold

Input high voltage limit

Input low voltage threshold

Input low voltage limit

Table 6. External trigger specifications

Condition

External digital

Software-selectable

Specification

TRIG_IN

Edge sensitive: user configurable for CMOS compatible rising or falling edge.

10 µs max

1µs min

Schmitt trigger, 47 k

Ω pull-down to ground

1.01 V typ

0.6 V min

1.5 V max

2.43 V typ

1.9 V min

3.1V max

5.5 V absolute max

1.42 V typ

1.0 V min

2.0 V max

–0.5 V absolute min

0 V recommended min

External clock input/output

Table 7. External clock I/O specifications

Parameter

Pin name

Pin type

Direction, software-selectable

Input clock rate

Clock pulse width

Input clock mode

Schmitt trigger hysteresis

Input high voltage threshold

Input high voltage limit

Input low voltage threshold

Input low voltage limit

Output high voltage

Output low voltage

Condition

Input

Output

Input

Output

Specification

SYNC

Bidirectional

Receives A/D pacer clock from external source

Outputs internal A/D pacer clock

50 kHz, maximum

1µs min

5µs min

Edge sensitive: rising edge

1.01 V typ

0.6 V min

1.5 V max

2.43 V typ

1.9 V min

3.1V max

5.5 V absolute max

1.42 V typ

1.0 V min

2.0 V max

–0.5 V absolute min

0 V recommended min

4.4 V min (IOH = –50 µA)

3.80 V min (IOH = –8 mA)

0.1 V max (IOL = 50 µA)

0.44 V max (IOL = 8 mA)

21

USB-1608FS User's Guide

Counter

Parameter

Pin name

Counter type

Number of channels

Input type

Input source

Resolution

Schmitt trigger hysteresis

Input high voltage threshold

Input high voltage limit

Input low voltage threshold

Input low voltage limit

Maximum input frequency

High pulse width

Low pulse width

Memory

Table 8. Counter specifications

Specification

CTR

Event counter

1

Schmitt trigger, 47 k

Ω pull-down to ground

CTR screw terminal

32 bits

1.01 V typ

0.6 V min

1.5 V max

2.43 V typ

1.9 V min

3.1V max

5.5 V absolute max

1.42 V typ

1.0 V min

2.0 V max

–0.5 V absolute min

0 V recommended min

1 MHz

500 ns min

500 ns min

Parameter

Data FIFO

EEPROM

EEPROM configuration

Table 9. Memory specifications

Specification

32,768 samples, 65,536 bytes

1,024 bytes

Address range Access

0x000-0x07F

0x080-0x1FF

0x200-0x3FF

Reserved

Read/write

Read/write

Microcontroller

Parameter

Type

Table 10. Microcontroller specifications

Specification

High performance 32-bit RISC microcontroller

Description

128 bytes system data

384 bytes cal data

512 bytes user area

22

USB-1608FS User's Guide

Power

Table 11. Power specifications

Parameter Condition

Supply current

Supply current (Note 3)

USB enumeration

Continuous mode

PC +5 V voltage range (Note 4)

Connected to self-powered hub

Connected to externally-powered root port hub

PC +5V output current (Note 5)

Specification

< 100 mA

150 mA

4.25 V min, 5.25 V max

300 mA max

Note 3:

This is the total current requirement for the USB-1608FS which includes up to 10 mA for the status

LED.

Note 4:

"Self-powered hub" refers to a USB hub with an external power supply. Self-powered hubs allow a connected USB device to draw up to 500 mA. "Root port hubs" reside in the PC USB host Controller.

The USB port(s) on your PC are root port hubs. All externally-powered root port hubs, such as a desktop PC, provide up to 500 mA of current for a USB device. Battery-powered root port hubs provide 100 mA or 500 mA, depending upon the manufacturer. A laptop PC that is not connected to an external power adapter is an example of a battery-powered root port hub. If your laptop PC is constrained to the 100 mA maximum, you need to purchase a self-powered hub.

Note 5:

This refers to the total amount of current that can be sourced from the USB +5 V and digital outputs.

General

Parameter

Device type

Device compatibility

Table 12. General specifications

Specification

USB 2.0 (full-speed)

USB 1.1, USB 2.0

Environmental

Parameter

Operating temperature range

Storage temperature range

Humidity

Mechanical

Table 13. Environmental specifications

Specification

0 °C to 70 °C

–40 °C to 70 °C

0% to 90% non-condensing

Parameter

Dimensions (L × W × H)

USB cable length

User connection length

Table 14. Mechanical specifications

Specification

3.10 × 3.20 × 1.05 in. (79 × 82 × 27 mm)

3 m (9.84 ft) max

3 m (9.84 ft) max

Screw terminal connector and pinout

Table 15. Connector specifications

Parameter

Connector type

Wire gauge range

Specification

Screw terminal

16 AWG to 30 AWG

23

USB-1608FS User's Guide

Pin Signal Name

5

6

7

8

1

2

3

4

CH0 IN

AGND

CH1 IN

AGND

CH2 IN

AGND

CH3 IN

AGND

9 CH4 IN

10 AGND

11 CH5 IN

12 AGND

13 CH6 IN

14 AGND

15 CH7 IN

16 AGND

17 CAL

18 AGND

19 AGND

20 AGND

Table 16. Connector pinout

Pin Signal Name

21 DIO0

22 GND

23 DIO1

24 GND

25 DIO2

26 GND

27 DIO3

28 GND

29 DIO4

30 GND

31 DIO5

32 GND

33 DIO6

34 GND

35 DIO7

36 SYNC

37 TRIG_IN

38 CTR

39 PC +5V

40 GND

24

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 product

USB-1608FS

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.

Equipment must be operated in a controlled electromagnetic environment as defined by Standards EN

61326-1:2006, or IEC 61326-1:2005.

Declaration of Conformity based on tests conducted by Chomerics Test Services, Woburn, MA 01801, USA in

May, 2004. Test records are outlined in Chomerics Test Report #EMI3876.04. Further testing was conducted by

Chomerics Test Services, Woburn, MA. 01801, USA in December, 2008. Test records are outlined in

Chomerics Test report #EMI5215B.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: [email protected]

www.mccdaq.com

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