Measurement USB-3110 User Manual

USB-2627

Document Revision 3
July 2014
© Copyright 2014

User's Guide

Multifunction Measurement and Control

HM USB-2627.docx

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2

Table of Contents

Preface

About this User's Guide ....................................................................................................................... 5

What you will learn from this user's guide ......................................................................................................... 5

Conventions in this user's guide ......................................................................................................................... 5

Where to find more information ......................................................................................................................... 5

Chapter 1

Introducing the USB-2627 .................................................................................................................... 6

Functional block diagram ................................................................................................................................... 7

Chapter 2

Installing the USB-2627 ........................................................................................................................ 8

What comes with your shipment? ....................................................................................................................... 8

Hardware .......................................................................................................................................................................... 8

Software ............................................................................................................................................................................ 8

Documentation ................................ ................................................................ ................................................................ .. 8

Optional components ........................................................................................................................................................ 8

Unpacking........................................................................................................................................................... 8

Installing the software ........................................................................................................................................ 8

Installing the hardware ....................................................................................................................................... 9

Configuring the hardware ................................................................................................................................... 9

Calibrating the hardware..................................................................................................................................... 9

Field calibration ................................................................................................................................................................ 9

Factory calibration ............................................................................................................................................................ 9

Chapter 3

Signal Connections ............................................................................................................................. 10

68-pin SCSI connector P1 ................................................................................................................................ 10

Cabling.............................................................................................................................................................................11

Signal termination ............................................................................................................................................................11

40-pin header connectors J2, J4, and J5 ................................................................ ................................ ............ 12

Cabling.............................................................................................................................................................................13

Signal termination ............................................................................................................................................................13

Chapter 4

Functional Details ............................................................................................................................... 14

Analog input modes .......................................................................................................................................... 14

Software paced .................................................................................................................................................................14

Hardware paced ...............................................................................................................................................................14

Burst mode........................................................................................................................................................ 14

USB-2627 components ..................................................................................................................................... 15

68-pin SCSI connector P1 ................................................................................................................................................15

40-pin header connectors J2, J4, and J5 ...........................................................................................................................16

USB connector .................................................................................................................................................................16

LEDs ................................................................................................................................................................................16

Standoffs ..........................................................................................................................................................................16

Signal descriptions ............................................................................................................................................ 16

Analog input ....................................................................................................................................................................16

Analog output ..................................................................................................................................................................17

Digital I/O ........................................................................................................................................................................17

Counter input ...................................................................................................................................................................18

Trigger input ....................................................................................................................................................................18

Timer output ....................................................................................................................................................................18

Ground ................................................................................................................................................................ .............18

Power output ....................................................................................................................................................................19

3

USB-2627 User's Guide

USB power ....................................................................................................................................................... 19

Mechanical drawing ......................................................................................................................................... 19

Chapter 5

Specifications ...................................................................................................................................... 20

Analog input ..................................................................................................................................................... 20

Accuracy ........................................................................................................................................................... 20

Analog input DC voltage measurement accuracy ............................................................................................................20

Noise performance ...........................................................................................................................................................21

Settling time for Multichannel Measurements .................................................................................................................21

Analog output ................................................................................................................................................... 21

Analog input/output calibration ........................................................................................................................ 22

Digital input/output........................................................................................................................................... 22

External trigger ................................................................................................................................ ................. 23

External clock ................................................................................................................................................... 23

Counter ............................................................................................................................................................. 23

Timer output ..................................................................................................................................................... 24

Memory ............................................................................................................................................................ 24

Power ................................................................................................................................................................ 24

USB .................................................................................................................................................................. 25

Environmental .................................................................................................................................................. 25

Mechanical ....................................................................................................................................................... 25

Signal connections ............................................................................................................................................ 25

68-pin SCSI connector (P1) .............................................................................................................................................26

40-pin header connectors (J2, J4, J5) ...............................................................................................................................27

Standoff locations ............................................................................................................................................. 28

4

About this User's Guide

What you will learn from this user's guide

This user's guide describes the Measurement Computing USB-2627 data acquisition device and lists device
specifications.

Conventions in this user's guide

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.

Preface

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-2627

The USB-2627 is a USB 2.0 high-speed device that is supported under the Microsoft® Windows® operating
system.

The USB-2627 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 (low­speed and full-speed).

The USB-2627 device provides the following features:

 16 single-ended (SE) analog inputs
 24 DIO channels; bit configurable for input or output
 Four analog outputs
 Four counter inputs
 Four timer outputs
 Digital trigger input
 External AI scan clock input
 External AO scan clock input
 One 68-pin SCSI connector and three 40-pin header connectors for field wiring connections

The USB-2627 is powered by the USB supply from the computer; external power is not required.

6

USB-2627 User's Guide Introducing the USB-2627

Functional block diagram

USB-2627 functions are illustrated in the block diagram shown in Figure 1.

Figure 1. USB-2627 functional block diagram

7

Installing the USB-2627

What comes with your shipment?

Verify that the following hardware components are included in the shipment:

Hardware

 USB-2627 (with standoffs)
 USB cable

Software

 MCC DAQ CD

Documentation

 MCC DAQ Quick Start Guide

The Quick Start Guide 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.

Chapter 2

Optional components

 Cables

o CA-68-3R
o C40FF-x

 Signal termination boards

o TB-100
o TB-103
o CIO-MINI40

Unpacking

As with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the USB-2627 from its packaging, ground yourself using a wrist strap or by simply
touching the computer chassis or other grounded object to eliminate any stored static charge.

If any components are missing or damaged, contact us immediately using one of the following methods:

 Knowledgebase: kb.mccdaq.com
 Phone: [phone] and follow the instructions for reaching Tech Support
 Fax: [phone] to the attention of Tech Support
 Email: [e-mail]

For international customers, contact your local distributor. Refer to the International Distributors section on our
website 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 at www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf.

8

USB-2627 User's Guide Installing the USB-2627

Installing the hardware

Install the software before you install your device

A driver needed to run the USB-2627 is installed when you install the software. Therefore, you need to install
the software package you plan to use before you install the hardware.

For operation on a Windows operating system, we recommend that you run Windows Update to update your
operating system with the latest USB drivers.

To connect a USB-2627 device to your system, turn on your computer and connect the USB cable to an
available USB port on the computer or to an externally powered USB hub connected to the computer.

When connected for the first time, a Found New Hardware dialog opens when the operating system detects the
device. When the dialog box closes, the installation is complete.

The Power LED (top LED) blinks during device detection and initialization, and then remains on. When the
board is first powered on, there is usually a momentary delay before the Power LED blinks or turns on.

Configuring the hardware

All hardware configuration options are programmable with software.
Caution! Avoid redundant connections. Ensure that there is no signal conflict between the 68-pin SCSI

connector (P1) and the 40-pin connectors (J2 to J5). Failure to do so could possibly cause
equipment damage and/or personal injury.

Turn off power to all devices connected to the system before making connections. Electrical shock
or damage to equipment can result even under low-voltage conditions.

Always handle components carefully, and never touch connector pins or circuit components unless
you are following ESD guidelines in an appropriate ESD-controlled area. These guidelines include
using properly-grounded mats and wrist straps, ESD bags and cartons, and related procedures.

Avoid touching board surfaces and onboard components. Only handle boards by their edges. Make
sure that the USB-2627 does not come into contact with foreign elements such as oils, water, and
industrial particulate.

The discharge of static electricity can damage some electronic components. Semiconductor
devices are especially susceptible to ESD damage.

Calibrating the hardware

Field calibration

The USB-2627 supports self-calibration. Run the InstaCal utility to calibrate the USB-2627 whenever the
ambient temperature changes by more than ±10 °C from the last self-calibration. The recommended calibration
interval is one year. Calibrate the inputs before calibrating the outputs.

Factory calibration

The Measurement Computing Manufacturing Test department performs the initial factory calibration. Return
the device to Measurement Computing Corporation if you want the factory calibration restored.

9

Chapter 3

Signal Connections

Board signals are available on the 68-pin SCSI connector P1 and 40-pin header connectors J2, J3, J4, and J5.
Caution! Avoid redundant connections! Make sure there is no signal conflict between the SCSI connector

pins and header connector pins. Failure to do so could possibly cause equipment damage and/or
personal injury.

Use the SCSI cable for optimal analog input settling time

To achieve the best analog input channel-channel settling time performance, connect your signals to the SCSI
connector (P1). If the J2 to J5 connectors are to be used, keep the interface cable as short as possible to
minimize settling errors.

68-pin SCSI connector P1

The SCSI connector provides connections to the board signals listed in Figure 2.

Figure 2. SCSI connector P1 pinout

10

USB-2627 User's Guide Signal Connections

TB2 terminal

SCSI pin

TB1 terminal

SCSI pin

+5V

19

ACH0

68

GND

GND

ACH8

34

A0

18

AGND

AGND

A1

52

ACH1

33

A2

17

ACH9

66

A3

51

AGND

AGND

A4

16

ACH2

65

A5

50

ACH10

31

A6

15

AGND

AGND

A7

49

ACH3

30

B0

14

ACH11

63

B1

48

AGND

AGND

B2

13

ACH4

28

B3

47

ACH12

61

B4

12

AGND

AGND

B5

46

ACH5

60

B6

11

ACH13

26

B7

45

AGND

AGND

C0

10

ACH6

25

C1

44

ACH14

58

C2

9

AGND

AGND

C3

43

ACH7

57

C4

8

ACH15

23

C5

42

XDAC3

56

C6

7

SGND

62

C7

41

NC (Note 1)

20

TTL TRG

6

XDAC2

55

GND

GND

GND (Note 2)

GND

CNT0

5

AGND

AGND

CNT1

39

XDAC0

22

CNT2

4

AGND

AGND

Cabling

Use a CA-68-3R cable (Figure 3) when connecting signals to the SCSI connector.

Figure 3. CA-68-3R cable

Signal termination

 TB-100 – screw terminal board that connects to SCSI connector P1 with a CA-68-3R cable. A 19-inch rack

mount kit (RM-TB-100) is also available.

The following table lists how TB-100 screw terminals are mapped to the SCSI connector pins.

TB-100 to SCSI connector pin map

11

USB-2627 User's Guide Signal Connections

TB2 terminal

SCSI pin

TB1 terminal

SCSI pin

CNT3

38

XDAC1

21

TMR0

3

AGND

AGND

TMR1

37

XAPCR

2

XDPCR

1

GND

GND

GND

GND

EGND

SCSI shell

Do not make connections to any terminal labeled NC.

Note 1: Labeled POSREF on the TB-100; not supported on the USB-2627.
Note 2: Labeled NEGREF on the TB-100; not supported on the USB-2627.

40-pin header connectors J2, J4, and J5

The header connectors provide alternative connections to the 68-pin connector. Pins 1, 2, 39, and 40 are labeled
on each connector.

J2 provides analog input connections. J4 provides digital, counter, timer, pacer input, and power output

connections. J5 provides analog output, timer, pacer I/O, and power output connections.
Caution! Avoid redundant connections! Make sure there is no signal conflict between the SCSI connector

pins and header connector pins. Failure to do so could possibly cause equipment damage and/or
personal injury.

Figure 4 shows the pinout for J2.

Figure 4. Header connector J2 pinout

12

USB-2627 User's Guide Signal Connections

Figure 5 shows the pinout for J4 and J5.

Figure 5. Header connector J4 and J5 pinout

For more information about signal connections

For more information about analog input connections, refer to the Guide to DAQ Signal Connections at

www.mccdaq.com/signals/signals.pdf.

Cabling

Use a C40FF-x cable (Figure 6) when connecting signals to a 40-pin header connector.

Figure 6. C40FF-x cable

Connecting a C40FF-x cable to each 40-pin connector provides greater signal connectivity than what is
provided by the SCSI connector.

Signal termination

 CIO-MINI40 – 40-pin screw terminal board that connects to the J2, J4, or J5 header connector with the

C40FF-x cable.

 TB-103 – screw terminal board that mounts directly onto the header connectors.

13

Chapter 4

Functional Details

Analog input modes

The USB-2627 can acquire analog input data in two modes – software paced and hardware paced.

Software paced

You can acquire one analog sample at a time in software paced mode. You initiate the A/D conversion with a
software command. The analog value is converted to digital data and returned to the computer. Repeat this
procedure until you have the total number of samples that you want.

The sample rate in software paced mode is system-dependent and can range from 33 S/s to 4000 S/s.

Hardware paced

You can acquire data from up to 16 channels in hardware paced mode. The analog data is continuously
acquired, converted to digital values, and written into the 4k FIFO buffer on the device until you stop the scan.
The FIFO buffer is serviced in blocks as the data is transferred from the FIFO buffer to the computer memory
buffer. You start a continuous scan with either a software command or with an external hardware trigger event.

The maximum sampling rate in hardware paced mode from one to 16 channels is 1,000 kS/s, max.

Burst mode

Burst mode is an optional scan mode used with the onboard pacer to obtain more precise timing between
samples. When burst mode is enabled, each successive channel in a scan is sampled at the maximum A/D rate.
This ensures that samples from each channel are taken as close as possible to the same absolute point in time.
When burst mode is disabled, data is sampled at evenly spaced intervals, allowing you to increase the sample
period time; doing so can improve settling time and overall measurement accuracy.

Multi-channel scanning with burst mode enabled and disabled is shown in Figure 7.

Figure 7. Multi-channel scan with burst mode enabled and disabled

The burst mode sample period is 1 µs.
You can trigger the acquisition with the external trigger, and control the clock period with the internal A/D

pacer clock.

14

USB-2627 User's Guide Functional Details

1

40-pin connector J4

5

40-pin connector J2

2

LEDs

6

40-pin connector J5

3

USB connector

7

Pull-up/down jumpers (W5. W6, W7)

4

68-pin SCSI connector P1

USB-2627 components

These USB-2627 components are shown in Figure 8.

 68-pin SCSI connector (P1)
 40-pin header connectors (J2, J4, and J5)
 USB connector
 LED indicators (USB and Power)

Figure 8. USB-2627 components

68-pin SCSI connector P1

The 68-pin SCSI connector provides the following connections:

 16 single-ended analog inputs (ACH0 to ACH15)
 Four analog outputs (XDAC0 to XDAC3)
 24 digital I/O (A0 to A7, B0 to B7, C0 to C7)
 Four counter inputs (CNT0 to CNT3)
 Two timer outputs (TMR0 to TMR1)
 External AI scan clock input (XAPCR)
 External AO scan clock input (XDPCR)
 External digital trigger input (TTLTRG)
 Power output (+VO)
 Analog ground and digital ground (AGND and GND)

Refer to Figure 2 on page 10 for the SCSI connector pinout.

15

USB-2627 User's Guide Functional Details

Element

Channel

Range

0

CH5

BIP10V

1

CH3

BIP10V

2

CH5

BIP10V

3

CH15

BIP10V

40-pin header connectors J2, J4, and J5

The header connectors provide alternative connections to the SCSI connector.

 J2 provides connections for the analog inputs.
 J4 provides connections for the DIO, counter inputs, timer outputs, input scan clock, and power output.
 J5 provides connections for the analog outputs, timer outputs, I/O scan clocks, and power output.

Refer to Figure 4 and Figure 5 on page 12 for header connector pinouts.

USB connector

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

LEDs

The USB-2627 has two LEDs – Power and Activity.

 The Power LED (top) turns on when the device is detected and installed on the computer.
 The Activity LED (bottom) blinks when data is transferred, and is off otherwise.

Standoffs

The board is shipped with standoffs that can be used for mounting onto a metal frame.

Signal descriptions

Analog input

The USB-2627 has a 16-bit A/D converter and provides 16 single-ended analog inputs. The input voltage range
is fixed at ±10 V. Analog input connections are available on the SCSI connector and on header connector J2:

 SCSI connector P1 provides connections for ACH0 to ACH15
 Header connector J2 provides connections for ACH0 to ACH15

Input pacer clock

You can pace input scanning operations using the input scan clock on the board or with an external signal
connected to XAPCR. The sampling rate is software-selectable for 0.0149 Hz to 1 MHz.

Channel-Gain queue

The USB-2627 channel-gain queue feature allows you to configure a list of channels to scan. The settings are
stored in a channel-gain queue list that is written to local memory on the device.

The channel-gain queue list can contain up to 16 elements. The channels can be listed in any order. An example
of a 4-element list is shown in the table below.

Sample channel-gain queue list

16

USB-2627 User's Guide Functional Details

Analog output

The USB-2627 has four 16-bit, 1 MHz analog output channels (XDAC0 to XDAC3). The output range is fixed at
±10 V. All outputs can be updated at 1 MS/s, regardless of the number of channels in a scan.

Analog output connections are available on the SCSI connector and header connector J5.

Output pacer clock

You can pace the output waveform using the DAC scan clock on the board or with an external signal connected
to XDPCR.

The on-board programmable clock can generate updates ranging from 0.0149 Hz to 1 MHz.

Digital I/O

The USB-2627 has 24 TTL-level digital I/O lines that are configured as three 8-bit ports. Each bit is
configurable as either input or output. Digital I/O connections are available on the SCSI connector and header
connector J4.

You can read digital input ports asynchronously before, during, or after an analog input scan. Digital outputs
can be updated asynchronously before, during, or after an acquisition.

Pull-up/down configuration

Each digital port has 47 kΩ resistors that are jumper configurable as pull-up or pull-down (default). Jumper W7
configures Port A, W6 configures Port B, and W5 configures Port C.

Caution! Turn off power to all devices connected to the system before making connections. Electrical shock

or damage to equipment can result even under low-voltage conditions.

Always handle components carefully, and never touch connector pins or circuit components unless
you are following ESD guidelines in an appropriate ESD-controlled area. These guidelines include
using properly-grounded mats and wrist straps, ESD bags and cartons, and related procedures.

Avoid touching board surfaces and onboard components. Only handle boards by their edges. Make
sure that the USB-2627 does not come into contact with foreign elements such as oils, water, and
industrial particulate.

The discharge of static electricity can damage some electronic components. Semiconductor
devices are especially susceptible to ESD damage.

Figure 9 shows the location of each jumper on the board.

Figure 9. Pull-up/down jumper locations

17

USB-2627 User's Guide Functional Details

Figure 10 shows the pull-up and pull-down configuration for each jumper.

Figure 10. Pull-up/down jumper configurations

For more information about digital signal connections

For general information about digital signal connections and digital I/O techniques, refer to the Guide to DAQ
Signal Connections at www.mccdaq.com/signals/signals.pdf.

Counter input

The four counter inputs (CNT0 to CNT3) are 32-bit event counters that can accept frequency inputs up to
20 MHz.

Figure 11. Typical counter input

Counter input connections are available on the SCSI connector and header connector J4.

Trigger input

The external digital trigger input (TTLTRIG) is software selectable for edge or level sensitive.

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

The default setting at power up is edge sensitive, rising edge. The trigger input connection is available on the
SCSI connector and header connectors J4 and J5.

Timer output

The four timer outputs (TMR0 to TMR3) are pulse width modulation (PWM) outputs that can generate a square
wave with a programmable frequency in the range of 0.015 Hz to 32 MHz. Figure 12 shows the timer output
schematic.

Figure 12. Typical timer output

Timer output connections are available on the SCSI connector and header connectors J4 and J5. TMR0 and
TMR1 are available on the SCSI connector and header connector J4. TMR2 and TMR3 are available on header
connector J5.

Ground

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

18

USB-2627 User's Guide Functional Details

Power output

The +VO pin can output up to 10 mA maximum. Use this terminal to power external devices or circuitry. Power
output connections are available on the SCSI connector and header connectors J4 and J5.

Caution! The +VO (+5V) terminal is an output. Do not connect to an external power supply or you may

damage the device and possibly the computer.

USB power

The maximum current that can be drawn by the device 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. If the current requirement of the device exceeds the current available from
the computer, connect to a self-powered hub or power the computer with an external power adapter.

Mechanical drawing

Figure 13. USB-2627 board dimensions

19

Parameter

Condition

Specification

A/D converter type

Successive approximation

ADC resolution

16 bits

Number of channels

16 single-ended

Input voltage range

±10 V

Absolute maximum input
voltage

CHx relative to AGND

 ±25 V max (power on)
 ±10.5 V max (power off)

Input impedance

 1 GΩ (power on)
 390 Ω (power off)

Input bias current

±100 pA

Input bandwidth

Small signal (–3 dB)

3.1 MHz

Input capacitance

40 pf

Maximum working voltage

±10.1 V max relative to AGND

Crosstalk

Adjacent channels, DC to
10 kHz

–80 dB
Input coupling

DC

Sampling rate

0.0149 Hz to 1,000 kHz; software-selectable

Trigger source

TTLTRG

A/D pacing

 Internal input scan clock
 External input scan clock (XAPCR)

Burst mode

Burst rate = 1 µs, software selectable

Throughput
Software paced

33 S/s to 4,000 S/s typ; system dependent

Hardware paced

1 MS/s max

Channel queue

Up to 16 element list of random channels

Warm-up time

15 minutes min

Range

Gain error
(% of reading)

Offset error
(µV)

INL error
(% of range)

Absolute
accuracy at
Full Scale
(µV)

Gain
temperature
coefficient
(% reading/°C)

Offset
temperature
coefficient
(µV/°C)

±10 V

0.031

915

0.0076

4775

0.0013

35

Specifications

All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.

Analog input

Table 1. General analog input specifications

Chapter 5

Accuracy

Analog input DC voltage measurement accuracy

Table 2. DC Accuracy components and specifications. All values are (±)

20

USB-2627 User's Guide Specifications

Range

Counts

LSBrms

±10 V

8

1.21

Range

1 µS settling accuracy
(% FSR)

5 µS settling accuracy
(% FSR)

10 µS settling accuracy
(% FSR)

±10 V

0.0152

0.0061

0.0015

Parameter

Condition

Specification

Number of channels

4 Resolution

16 bits

Output ranges

Calibrated

±10 V

Output transient

Host computer is reset, powered on, suspended,
or a reset command is issued to the device

Duration: 100 ms
Amplitude: 2V p-p

Powered off

Duration: 100 ms
Amplitude: 5 V peak

Differential
non-linearity

±0.25 LSB typ
±1 LSB max

Output current

XDACx pins

±3.5 mA max

Output short-circuit
protection

XDACx connected to AGND

Unlimited duration
Output coupling

DC

Power on and
reset state

DACs cleared to zero-scale: 0 V, ±150 mV

Pacer source

Two programmable sources:

 Internal output scan clock
 External output scan clock (XDPCR),

independent of external input scan clock
(XAPCR)

Trigger sources

TTLTRIG (see External trigger on page 23)

Output update rate

1 MS/s max (Note 3)

Settling time

To rated accuracy, 10 V step

2 µs

Slew rate

20 V/µs

Throughput
Software paced

33 S/s to 4,000 S/s typ, system-dependent

Hardware paced

1 MS/s max, system-dependent

Noise performance

For the peak-to-peak noise distribution test, a single-ended input channel is connected to AGND at the input
terminal block, and 32,000 samples are acquired at the maximum rate.

Table 3. Noise performance specifications

Settling time for Multichannel Measurements

Settling time is defined as the accuracy that can be expected after one conversion when switching from a
channel with a DC input at one extreme of full scale to another channel with a DC input at the other extreme of
full scale.

Table 4. Input settling time specifications in µS, typical

Analog output

Table 5. Analog output specifications

Note 1: Leave unused XDACx output channels disconnected.
Note 2: XDACx defaults to 0 V whenever the host computer is reset, powered on, suspended, or a reset

command is issued to the device.

21

USB-2627 User's Guide Specifications

Range

Absolute accuracy (±LSB)

±10 V

16.0

Range

% of reading

Offset
(±mV)

Offset tempco
(µV/°C)

Gain tempco
(ppm of range/°C)

±10 V

±0.0183

1.831

12.7

13

Range

Relative accuracy (INL)

±10 V

4.0 typ

Parameter

Specification

Recommended warm-up time

15 minutes min

Calibration method

Self-calibration (firmware)

Calibration interval

1 year (factory calibration)

AI calibration reference

+5 V, ±2.5 mV max. Actual measured values stored in EEPROM.

Tempco: 5 ppm/°C max

Long term stability: 15 ppm/1,000 hours

AO calibration procedure

The analog output pins are internally routed to the analog input circuit.
For best calibration results, disconnect any XDACx connections at the I/O connectors
prior to performing AOUT calibration.

Parameter

Specification

Digital type

TTL

Number of I/O

24

Configuration

Three banks of 8. Each bit may be configured as input (power on default) or output.

Pull-up configuration

Each port has 47 kΩ resistors that are configurable as pull-up or pull-down (default)
using an onboard jumper (W5, W6, W7).

Digital I/O transfer rate
(system-paced, asynchronous)

33 to 4,000 port reads/writes or single bit reads/writes per second typ;
system dependent.

Input high voltage

2.0 V min

5.0 V absolute max

Input low voltage

0.8 V max
0 V recommended min

Output high voltage

4.4 V min (IOH = –50 µA)

3.76 V min (IOH = –24 mA)

Output low voltage

0.1 V max (IOL = 50 µA)

0.44 V max (IOL = 24 mA)

Output current

60 mA max, not to exceed 24 mA for one bit, resulting in 2.5 mA max when all 24 bits
are enabled.

Note 3: The DAC update rate is not affected by the number of channels in the scan.

Table 6. Calibrated absolute accuracy specifications

Table 7. Calibrated absolute accuracy components specifications

Table 8. Relative accuracy specifications (±LSB)

Analog input/output calibration

Table 9. Analog input/output calibration specifications

Digital input/output

Table 10. Digital input/output specifications

22

USB-2627 User's Guide Specifications

Parameter

Specification

Trigger source

TTLTRG

Trigger mode

Software programmable for edge or level sensitive, rising or falling edge, high or low
level. Power on default is edge sensitive, rising edge.

Trigger latency

1 µs + 1 clock cycle max

Trigger pulse width

100 ns min

Input type

33 Ω series resistor and 49.9 kΩ pull-down to GND

Input high voltage

2.2 V min

5.5 V absolute max

Input low voltage

1.5 V max
–0.5 V absolute min
0 V recommended min

Parameter

Specification

Terminal names

XAPCR, XDPCR

Terminal types

Input, active on rising edge

Terminal descriptions

Receives pacer clock from external source

Input clock rate

1 MHz max

Clock pulse width

100 ns min

Input type

33 Ω series resistor, 47 kΩ pull-down to GND

Input high voltage

2.2 V min

5.5 V absolute max

Input low voltage

1.5 V max
–0.5 V absolute min
0 V recommended min

Parameter

Specification

Terminal names

CNT0, CNT1, CNT2, CNT3

Number of channels

4 channels

Resolution

32-bit

Counter type

Event counter

Input type

33 Ω series resistor, 47 kΩ pull-down to GND

Input source

68-pin SCSI: CNT0 (pin 5), CNT1 (pin 39), CNT2 (pin 4), CNT3 (pin 38)
40-pin (J4): CNT0 (pin 35), CNT1 (pin 34), CNT2 (pin 37), CNT3 (pin 36)

Counter read/writes rates
(software paced)

33 to 8,000 reads/writes per second typ; system dependent
Input high voltage

2.2 V min

Input low voltage

1.5 V max

Maximum input voltage range

–5 V to +10 V max

Input frequency

20 MHz, max

High pulse width

100 ns, min

Low pulse width

100 ns, min

External trigger

Table 11. External trigger specifications

External clock

Table 12. External clock I/O specifications

Counter

Table 13. Counter specifications

23

USB-2627 User's Guide Specifications

Parameter

Specification

Terminal name

TMR0, TMR1, TMR2, TMR3

Number of channels

4 channels

Timer type

PWM output with count, period, delay, and pulse width registers

Output value

Default state is idle low with pulses high, software-selectable, output invert

Input source

68-pin SCSI: TMR0 (pin 3), TMR1 (pin 37)
40-pin (J4): TMR0 (pin 33), TMR1 (pin 32)
40-pin (J5): TMR2 (pin 31), TMR3 (pin 35)

Internal clock frequency

64 MHz

Register widths

32-bit

High pulse width

10.42 ns, min

Low pulse width

10.42 ns, min

Output high voltage

4.4 V min (IOH = –50 µA)

3.76 V min (IOH = –1.0 mA)

Output low voltage

0.1 V max (IOL = 50 µA)

0.44 V max (IOL = 1.0 mA)

Output waveform

Square wave

Output rate

64 MHz base rate divided by 232; software-selectable.

Parameter

Specification

Data FIFO

4 kS analog input/2 kS analog output

Non-volatile memory

32 KB (30 KB firmware storage, 2 KB calibration/user data)

Parameter

Condition

Specification

Supply current (Note 4, Note 5)

Quiescent current

360 mA

+VO output voltage range

4.25V to 5.25V

+VO output current

10 mA max

Timer output

Table 14. Timer output specifications

Memory

Table 15. Memory specifications

Power

Table 16. Power specifications

Note 4: This is the total quiescent current requirement for the device that includes up to 10 mA for the Status

LED. This value does not include potential loading of the DIO bits, +VO pin, or the XDACx outputs.

Note 5: USB 2.0 ports are required by USB 2.0 standards to supply 2500 mW (nominal at 5 V, 500 mA).

Self-powered hubs and externally-powered root port hubs provide up to 500 mA of current for a USB
device. Battery-powered root port hubs, such as in a laptop PC, provide 100 mA or 500 mA, depending
on the manufacturer. If your laptop is constrained to the 100 mA maximum, you need to purchase a
self-powered hub.

24

USB-2627 User's Guide Specifications

Parameter

Specification

USB device type

USB 2.0 (high-speed)

Device compatibility

USB 1.1, USB 2.0

USB cable type

A-B cable, UL type AWM 2725 or equivalent. (min 24 AWG VBUS/GND,
min 28 AWG D+/D–)

USB cable length

3 m (9.84 ft) max

Parameter

Specification

Operating temperature range

0 °C to 55 °C max

Storage temperature range

–40 °C to 85 °C max

Humidity

0% to 90% non-condensing max

Parameter

Specification

PCB dimensions (L × W)

152.4 × 150.62 mm (6.00 × 5.93 in.)

Parameter

Specification

Connector type

P1: 68-pin standard SCSI TYPE III female connector
J2, J4, J5: Three 40-pin header connectors AMP# 2-103328-0

Compatible cables

P1: CA-68-3R ribbon cable; 3 feet.
J2, J4, J5: C40FF-x ribbon cable; x is length in feet.

Compatible terminal boards

TB-100: Connects to a CA-68-3R cable
TB-103: Mounts directly onto the header connectors
CIO-MINI40: Connects to a C40FF-x cable

USB

Table 17. USB specifications

Environmental

Table 18. Environmental specifications

Mechanical

Signal connections

Table 20. Board connectors, cables, and compatible hardware

Table 19. Mechanical specifications

25

USB-2627 User's Guide Specifications

Pin

Signal name

Pin description

Pin

Signal name

Pin description

68

ACH0

Analog input 0

34

ACH8

Analog input 8

67

AGND

Analog ground

33

ACH1

Analog input 1

66

ACH9

Analog input 9

32

AGND

Analog ground

65

ACH2

Analog input 2

31

ACH10

Analog input 10

64

AGND

Analog ground

30

ACH3

Analog input 3

63

ACH11

Analog input 11

29

AGND

Analog ground

62

AGND

Analog ground

28

ACH4

Analog input 4

61

ACH12

Analog input 12

27

AGND

Analog ground

60

ACH5

Analog input 5

26

ACH13

Analog input 13

59

AGND

Analog ground

25

ACH6

Analog input 6

58

ACH14

Analog input 14

24

AGND

Analog ground

57

ACH7

Analog input 7

23

ACH15

Analog input 15

56

XDAC3

Analog output channel 3

22

XDAC0

Analog output 0

55

XDAC2

Analog output channel 2

21

XDAC1

Analog output1

54

AGND

Analog ground

20

NC

No connection

53

GND

Digital ground

19

+VO

Power output

52

A1

Port A bit 1

18

A0

Port A bit 0

51

A3

Port A bit 3

17

A2

Port A bit 2

50

A5

Port A bit 5

16

A4

Port A bit 4

49

A7

Port A bit 7

15

A6

Port A bit 6

48

B1

Port B bit 1

14

B0

Port B bit 0

47

B3

Port B bit 3

13

B2

Port B bit 2

46

B5

Port B bit 5

12

B4

Port B bit 4

45

B7

Port B bit 7

11

B6

Port B bit 6

44

C1

Port C bit 1

10

C0

Port C bit 0

43

C3

Port C bit 3

9

C2

Port C bit 2

42

C5

Port C bit 5

8

C4

Port C bit 4

41

C7

Port C bit 7

7

C6

Port C bit 6

40

GND

Digital ground

6

TTLTRG

External digital trigger input

39

CNT1

Counter input 1

5

CNT0

Counter input 0

38

CNT3

Counter input 3

4

CNT2

Counter input 2

37

TMR1

Timer output 1

3

TMR0

Timer output 0

36

GND

Digital ground

2

XAPCR

External analog input scan clock

35

GND

Digital ground

1

XDPCR

External analog output scan clock

68-pin SCSI connector (P1)

Table 21. P1 connector pinout

26

USB-2627 User's Guide Specifications

Pin

Signal name

Pin description

Pin

Signal name

Pin description

1

NC

No connection

2

NC

No connection

3

NC

No connection

4

NC

No connection

5

AGND

Analog ground

6

AGND

Analog ground

7

ACH3

Analog input 3

8

ACH11

Analog input 11

9

ACH2

Analog input 2

10

ACH10

Analog input 10

11

NC

No connection

12

NC

No connection

13

NC

No connection

14

NC

No connection

15

ACH1

Analog input 1

16

ACH9

Analog input 9

17

ACH0

Analog input 0

18

ACH8

Analog input 8

19

AGND

Analog ground

20

AGND

Analog ground

21

NC

No connection

22

NC

No connection

23

NC

No connection

24

NC

No connection

25

ACH7

Analog input 7

26

ACH15

Analog input 15

27

ACH6

Analog input 6

28

ACH14

Analog input 14

29

AGND

Analog ground

30

NC

No connection

31

NC

No connection

32

NC

No connection

33

NC

No connection

34

ACH5

Analog input 5

35

ACH13

Analog input 13

36

ACH4

Analog input 4

37

ACH12

Analog input 12

38

AGND

Analog ground

39

AGND

Analog ground

40

AGND

Analog ground

Pin

Signal name

Pin description

Pin

Signal name

Pin description

1

GND

Digital ground

2

XAPCR

External analog input scan clock

3

A0

Port A bit 0

4

A4

Port A bit 4

5

A1

Port A bit 1

6

A5

Port A bit 5

7

A2

Port A bit 2

8

A6

Port A bit 6

9

A3

Port A bit 3

10

A7

Port A bit 7

11

GND

Digital ground

12

TTLTRG

External digital trigger input

13

B0

Port B bit 0

14

B4

Port B bit 4

15

B1

Port B bit 1

16

B5

Port B bit 5

17

B2

Port B bit 2

18

B6

Port B bit 6

19

B3

Port B bit 3

20

B7

Port B bit 7

21

GND

Digital ground

22

+VO

Power output

23

C0

Port C bit 0

24

C4

Port C bit 4

25

C1

Port C bit 1

26

C5

Port C bit 5

27

C2

Port C bit 2

28

C6

Port C bit 6

29

C3

Port C bit 3

30

C7

Port C bit 7

31

GND

Digital ground

32

TMR1

Timer output 1

33

TMR0

Timer output 0

34

CNT1

Counter input 1

35

CNT0

Counter input 0

36

CNT3

Counter input 3

37

CNT2

Counter input 2

38

GND

Digital ground

39

GND

Digital ground

40

GND

Digital ground

40-pin header connectors (J2, J4, J5)

Table 22. J2 connector pinout

Table 23. J4 connector pinout

27

USB-2627 User's Guide Specifications

Pin

Signal name

Pin description

Pin

Signal name

Pin description

1

NC

No connection

2

NC

No connection

3

NC

No connection

4

NC

No connection

5

AGND

Analog ground

6

AGND

Analog ground

7

XDAC0

Analog output 0

8

XDAC2

Analog output 2

9

XDAC1

Analog output 1

10

XDAC3

Analog output 3

11

AGND

Analog ground

12

AGND

Analog ground

13

NC

No connection

14

AGND

Analog ground

15

AGND

Analog ground

16

AGND

Analog ground

17

TTLTRG

External digital trigger input

18

XDPCR

External analog output scan clock

19

XAPCR

External analog input scan clock

20

GND

Digital ground

21

GND

Digital ground

22

GND

Digital ground

23

NC

No connection

24

NC

No connection

25

+VO

Power output

26

NC

No connection

27

NC

No connection

28

NC

No connection

29

GND

Digital ground

30

NC

No connection

31

TMR2

Timer output 2

32

NC

No connection

33

GND

Digital ground

34

NC

No connection

35

TMR3

Timer output 3

36

NC

No connection

37

GND

Digital ground

38

NC

No connection

39

NC

No connection

40

NC

No connection

Table 24. J5 connector pinout

Standoff locations

The board is designed with standoff holes labeled TL1 to TL8.

 TL1: Standoff hole TL1 Is connected directly to the J1 USB connector shield.
 TL2: Standoff hole TL2 is connected directly to the P1 SCSI connector shield (pin 69, pin 70). The SCSI

connector shield and TL2 can also be connected to the board chassis ground guard trace using the R21
(OPEN by default) resistor location.

 TL4-8: Standoff holes TL4-TL8 are electrically isolated from the PCB.
Refer to the mechanical drawing in the hardware user guide for the location of these standoff holes.

28

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