USB-2627

Multifunction Measurement and Control

User's Guide

January 2019. Rev 4© Measurement Computing Corporation

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Measurement Computing Corporation, InstaCal, Universal Library, and the Measurement Computing logo areeither 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.
© 2019 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.
NoticeMeasurement 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 ininjury. 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 ofpeople.

HM USB-2627.docx

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
Unpacking........................................................................................................................................................... 8
Installing the software ........................................................................................................................................ 8
Installing the hardware ....................................................................................................................................... 8
Configuring the hardware ................................................................................................................................... 8
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 ............................................................................................................................................................1140-pin header connectors J2, J4, and J5............................................................................................................ 12
Cabling.............................................................................................................................................................................13Signal 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 ..........................................................................................................................................................................16Signal 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

USB power ....................................................................................................................................................... 19
Mechanical drawing ......................................................................................................................................... 193

USB-2627 User's Guide

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........................................................................................................................................... 22External 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

Preface

About this User's Guide
What you will learn from this user's guideThis 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.

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.

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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

Chapter 2

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

Installing the software
Refer to the MCC DAQ Quick Start and the USB-2627 product page on our website for information about thesoftware that supports the device.
Install the software before you install your device
The driver needed to run the USB-2627 is installed with the software. Therefore, you need to install thesoftware package you plan to use before you install the hardware.

Installing the hardware
To connect a USB-2627 device to your system, turn on your computer and connect the USB cable to anavailable 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 thedevice. 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 theboard 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, andindustrial particulate.
The discharge of static electricity can damage some electronic components. Semiconductor
devices are especially susceptible to ESD damage.

8

USB-2627 User's Guide

Installing the USB-2627

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

Factory calibration
The Measurement Computing Manufacturing Test department performs the initial factory calibration. Returnthe 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 tominimize 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

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
TB2 terminal

SCSI pin

TB1 terminal

SCSI pin

+5V
GND
A0
A1
A2
A3
A4
A5
A6
A7
B0
B1
B2
B3
B4
B5
B6
B7
C0
C1
C2
C3
C4
C5
C6
C7
TTL TRG
GND
CNT0
CNT1
CNT2

19
GND
18
52
17
51
16
50
15
49
14
48
13
47
12
46
11
45
10
44
9
43
8
42
7
41
6
GND
5
39
4

ACH0
ACH8
AGND
ACH1
ACH9
AGND
ACH2
ACH10
AGND
ACH3
ACH11
AGND
ACH4
ACH12
AGND
ACH5
ACH13
AGND
ACH6
ACH14
AGND
ACH7
ACH15
XDAC3
SGND
NC (Note 1)
XDAC2
GND (Note 2)
AGND
XDAC0
AGND

68
34
AGND
33
66
AGND
65
31
AGND
30
63
AGND
28
61
AGND
60
26
AGND
25
58
AGND
57
23
56
62
20
55
GND
AGND
22
AGND

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USB-2627 User's Guide

Signal Connections

TB2 terminal

SCSI pin

TB1 terminal

CNT3
38
XDAC1
TMR0
3
AGND
TMR1
37
XAPCR
XDPCR
1
GND
GND
GND
EGND
Do not make connections to any terminal labeled NC.

SCSI pin
21
AGND
2
GND
SCSI shell

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 labeledon 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 (available
for download on our website at www.mccdaq.com/support/DAQ-Signal-Connections.aspx).

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 isprovided 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 asoftware command. The analog value is converted to digital data and returned to the computer. Repeat thisprocedure until you have the total number of samples that you want.
The sample rate in software paced mode is system-dependent and can range from 33 S/s to 4000 S/s.

Hardware paced
You can acquire data from up to 16 channels in hardware paced mode. The analog data is continuously
acquired, converted to digital values, and written into the 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.
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USB-2627 User's Guide

Functional Details

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)

1
2
3
4

40-pin connector J4
LEDs
USB connector
68-pin SCSI connector P1

56
740-pin connector J2
40-pin connector J5
Pull-up/down jumpers (W5. W6, W7)

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.

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USB-2627 User's Guide

Functional Details

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
Element

Channel

Range

0
1
2
3

CH5
CH3
CH5
CH15

BIP10V
BIP10V
BIP10V
BIP10V16

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 isconfigurable 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, andindustrial 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

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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 (available for download on our website at www.mccdaq.com/support/DAQ-SignalConnections.aspx).

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 squarewave 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.

GroundThe 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.
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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 fromthe 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

Chapter 5

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

Analog input
Table 1. General analog input specifications
Parameter

Condition

Specification

A/D converter type
ADC resolution

Successive approximation
16 bits

Number of channels

16 single-ended

Input voltage range
Absolute maximum input
voltageCHx relative to AGND

Input impedance
Input bias current
Input bandwidth
Input capacitance
Maximum working voltage
Crosstalk

Small signal (–3 dB)

Adjacent channels, DC to
10 kHzInput coupling
Sampling rate
Trigger source
A/D pacing
Burst mode
Throughput±10 V
 ±25 V max (power on)
 ±10.5 V max (power off) 1 GΩ (power on)
 390 Ω (power off)±100 pA
3.1 MHz
40 pf±10.1 V max relative to AGND
–80 dBDC
0.0149 Hz to 1,000 kHz; software selectable
TTLTRG Internal input scan clock External input scan clock (XAPCR)
Burst rate = 1 µs, software selectable
33 S/s to 4,000 S/s typ; system dependent
1 MS/s max
Up to 16 element list of random channels
15 minutes min

Software paced
Hardware paced

Channel queue
Warm-up time

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

Gain error(% of reading)

Offset error(µV)

INL error(% of range)

Absolute
accuracy at
Full Scale
(µV)

Gain
temperature
coefficient(% reading/°C)

Offsettemperature
coefficient(µV/°C)

±10 V

0.031

915

0.00764775

0.001335

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USB-2627 User's Guide

Specifications

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
Range

Counts

LSBrms

±10 V

8

1.21

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

1 µS settling accuracy(% FSR)

5 µS settling accuracy(% FSR)

10 µS settling accuracy(% FSR)±10 V

0.01520.00610.0015

Analog output
Table 5. Analog output specifications
Parameter
Number of channels
Resolution
Output ranges
Output transient

Condition

Specification

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

4
16 bits±10 V
Duration: 100 ms
Amplitude: 2V p-p
Duration: 100 ms
Amplitude: 5 V peakPowered off
Differential
non-linearity
Output current
Output short-circuit
protection
Output couplingPower on andreset state
Pacer source

Trigger sources
Output update rate
Settling timeSlew rate
Throughput
Note 1:
Note 2:
Note 3:±0.25 LSB typ±1 LSB max±3.5 mA max
Unlimited duration

XDACx pins
XDACx connected to AGND

DC
DACs cleared to zero-scale: 0 V, ±150 mV
Two programmable sources: Internal output scan clock External output scan clock (XDPCR),
independent of external input scan clock(XAPCR)
TTLTRIG (see External trigger on page 23)
1 MS/s max (Note 3)
2 µs
20 V/µs
33 S/s to 4,000 S/s typ, system dependent
1 MS/s max, system dependent

To rated accuracy, 10 V step
Software paced
Hardware paced

Leave unused XDACx output channels disconnected.
XDACx defaults to 0 V whenever the host computer is reset, powered on, suspended, or a reset command isissued to the device.
The DAC update rate is not affected by the number of channels in the scan.

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USB-2627 User's Guide

Specifications

Table 6. Calibrated absolute accuracy specifications
Range

Absolute accuracy (±LSB)

±10 V

16.0
Table 7. Calibrated absolute accuracy components specifications

Range% of reading

Offset(±mV)

Offset tempco(µV/°C)

Gain tempco(ppm of range/°C)±10 V±0.0183

1.831

12.7

13

Table 8. Relative accuracy specifications (±LSB)
Range

Relative accuracy (INL)±10 V

4.0 typ

Analog input/output calibration
Table 9. Analog input/output calibration specifications
Parameter

Specification

Recommended warm-up time
Calibration method
Calibration interval
AI calibration reference

15 minutes min
Self-calibration (firmware)
1 year (factory calibration)+5 V, ±2.5 mV max. Actual measured values stored in EEPROM.
Tempco: 5 ppm/°C max
Long term stability: 15 ppm/1,000 hours
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.

AO calibration procedure

Digital input/output
Table 10. Digital input/output specifications
Parameter

Specification

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

TTL
24
Three banks of 8. Each bit may be configured as input (power on default) or output.
Each port has 47 kΩ resistors that are configurable as pull-up or pull-down (default)
using an onboard jumper (W5, W6, W7).
33 to 4,000 port reads/writes or single bit reads/writes per second typ;system dependent
2.0 V min
5.0 V absolute max
0.8 V max
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)
60 mA max, not to exceed 24 mA for one bit, resulting in 2.5 mA max when all 24 bits
are enabled.

Digital I/O transfer rate(system-paced, asynchronous)
Input high voltage
Input low voltage
Output high voltage
Output low voltage
Output current

22USB-2627 User's Guide

Specifications

External trigger
Table 11. External trigger specifications
Parameter

Specification

Trigger source
Trigger mode

TTLTRG
Software programmable for edge or level sensitive, rising or falling edge, high or low
level. Power on default is edge sensitive, rising edge.
1 µs + 1 clock cycle max
100 ns min
33 Ω series resistor and 49.9 kΩ pull-down to GND
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
Input high voltage
Input low voltage

External clock
Table 12. External clock I/O specifications
Parameter

Specification

Terminal names
Terminal types
Terminal descriptions
Input clock rate
Clock pulse width
Input type
Input high voltage

XAPCR, XDPCR
Input, active on rising edge
Receives pacer clock from external source
1 MHz max
100 ns min
33 Ω series resistor, 47 kΩ pull-down to GND
2.2 V min
5.5 V absolute max
1.5 V max
–0.5 V absolute min
0 V recommended min

Input low voltage

CounterTable 13. Counter specifications
Parameter

Specification

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

CNT0, CNT1, CNT2, CNT3
4 channels
32-bitEvent counter
33 Ω series resistor, 47 kΩ pull-down to GND
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)
33 to 8,000 reads/writes per second typ; system dependent

Counter read/writes rates(software paced)
Input high voltage
Input low voltage
Maximum input voltage range
Input frequency
High pulse width
Low pulse width

2.2 V min
1.5 V max
–5 V to +10 V max
20 MHz max
25 ns min
25 ns min23

USB-2627 User's Guide

Specifications

Timer output
Table 14. Timer output specifications
Parameter

Specification

Terminal name
Number of channels
Timer typeOutput value
Input source

TMR0, TMR1, TMR2, TMR3
4 channels
PWM output with count, period, delay, and pulse width registers
Default state is idle low with pulses high, software selectable, output invert
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)
64 MHz32-bit10.42 ns min
10.42 ns min
4.4 V min (IOH = –50 µA)
3.76 V min (IOH = –1.0 mA)
0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 1.0 mA)
Square wave
64 MHz base rate divided by 232; software selectable

Internal clock frequency
Register widths
High pulse width
Low pulse width
Output high voltage
Output low voltage
Output waveform
Output rate

MemoryTable 15. Memory specifications
Parameter

Specification

Data FIFO
Non-volatile memory

4 kS analog input/2 kS analog output
32 KB (30 KB firmware storage, 2 KB calibration/user data)

Power
Table 16. Power specifications
Parameter

Condition

Specification

Supply current (Note 4, Note 5)+VO output voltage range+VO output current

Quiescent current

360 mA
4.25 V to 5.25 V
10 mA max

Note 4:Note 5:This is the total quiescent current requirement for the device that includes up to 10 mA for the Status LED. Thisvalue does not include potential loading of the DIO bits, +VO pin, or the XDACx outputs.
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

USB
Table 17. USB specifications
Parameter

Specification

USB device type
Device compatibility
USB cable type

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

USB cable length

Environmental
Table 18. Environmental specifications
Parameter

Specification

Operating temperature range
Storage temperature range
Humidity

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

Mechanical
Table 19. Mechanical specifications
Parameter

Specification

PCB dimensions (L × W)

152.4 × 150.62 mm (6.00 × 5.93 in.)

Signal connections
Table 20. Board connectors, cables, and compatible hardware
Parameter

Specification

Connector typeP1:
J2, J4, J5:P1:
J2, J4, J5:
TB-100:
TB-103:
CIO-MINI40:

Compatible cables
Compatible terminal boards

68-pin standard SCSI TYPE III female connector
Three 40-pin header connectors AMP# 2-103328-0
CA-68-3R ribbon cable; 3 feet.
C40FF-x ribbon cable; x is length in feet.
Connects to a CA-68-3R cable
Mounts directly onto the header connectors
Connects to a C40FF-x cable25

USB-2627 User's Guide

Specifications

68-pin SCSI connector (P1)
Table 21. P1 connector pinout
Pin
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35

Signal name
ACH0
AGND
ACH9
ACH2
AGND
ACH11
AGND
ACH12
ACH5
AGND
ACH14
ACH7
XDAC3
XDAC2
AGND
GND
A1
A3
A5
A7
B1
B3
B5
B7
C1
C3
C5
C7
GND
CNT1
CNT3
TMR1
GND
GND

Pin description
Analog input 0
Analog ground
Analog input 9
Analog input 2
Analog ground
Analog input 11
Analog ground
Analog input 12
Analog input 5
Analog ground
Analog input 14
Analog input 7
Analog output channel 3
Analog output channel 2
Analog ground
Digital ground
Port A bit 1
Port A bit 3
Port A bit 5
Port A bit 7
Port B bit 1
Port B bit 3
Port B bit 5
Port B bit 7
Port C bit 1
Port C bit 3
Port C bit 5
Port C bit 7
Digital ground
Counter input 1
Counter input 3
Timer output 1
Digital ground
Digital ground

Pin
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

26

Signal name
ACH8
ACH1
AGND
ACH10
ACH3
AGND
ACH4
AGND
ACH13
ACH6
AGND
ACH15
XDAC0
XDAC1
NC
+VO
A0
A2
A4
A6
B0
B2
B4
B6
C0
C2
C4
C6
TTLTRG
CNT0
CNT2
TMR0
XAPCR
XDPCR

Pin description
Analog input 8
Analog input 1
Analog ground
Analog input 10
Analog input 3
Analog ground
Analog input 4
Analog ground
Analog input 13
Analog input 6
Analog ground
Analog input 15
Analog output 0
Analog output1
No connection
Power output
Port A bit 0
Port A bit 2
Port A bit 4
Port A bit 6
Port B bit 0
Port B bit 2
Port B bit 4
Port B bit 6
Port C bit 0
Port C bit 2
Port C bit 4
Port C bit 6External digital trigger input
Counter input 0
Counter input 2
Timer output 0
External analog input scan clock
External analog output scan clockUSB-2627 User's Guide

Specifications

40-pin header connectors (J2, J4, J5)
Table 22. J2 connector pinout
Pin
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39

Signal name
NC
NC
AGND
ACH3
ACH2
NC
NC
ACH1
ACH0
AGND
NC
NC
ACH7
ACH6
AGND
NC
NC
ACH13
ACH12
AGND

Pin description
No connection
No connection
Analog ground
Analog input 3
Analog input 2
No connection
No connection
Analog input 1
Analog input 0
Analog groundNo connection
No connection
Analog input 7
Analog input 6
Analog groundNo connection
No connection
Analog input 13
Analog input 12
Analog ground

Pin
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40

Signal name
NC
NC
AGND
ACH11
ACH10
NC
NC
ACH9
ACH8
AGND
NC
NC
ACH15
ACH14
NC
NC
ACH5
ACH4
AGND
AGND

Pin description
No connection
No connection
Analog ground
Analog input 11
Analog input 10
No connection
No connection
Analog input 9
Analog input 8
Analog groundNo connection
No connection
Analog input 15
Analog input 14
No connection
No connection
Analog input 5
Analog input 4
Analog ground
Analog ground

Table 23. J4 connector pinout
Pin
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39

Signal name
GND
A0
A1
A2
A3
GND
B0
B1
B2
B3
GND
C0
C1
C2
C3
GND
TMR0
CNT0
CNT2
GND

Pin description
Digital ground
Port A bit 0
Port A bit 1
Port A bit 2
Port A bit 3
Digital ground
Port B bit 0
Port B bit 1
Port B bit 2
Port B bit 3
Digital ground
Port C bit 0
Port C bit 1
Port C bit 2
Port C bit 3
Digital ground
Timer output 0
Counter input 0
Counter input 2
Digital ground

Pin
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40

27

Signal name
XAPCR
A4
A5
A6
A7
TTLTRG
B4
B5
B6
B7
+VO
C4
C5
C6
C7
TMR1
CNT1
CNT3
GND
GND

Pin description
External analog input scan clock
Port A bit 4
Port A bit 5
Port A bit 6
Port A bit 7External digital trigger input
Port B bit 4
Port B bit 5
Port B bit 6
Port B bit 7
Power output
Port C bit 4
Port C bit 5
Port C bit 6
Port C bit 7
Timer output 1
Counter input 1
Counter input 3
Digital ground
Digital groundUSB-2627 User's Guide

Specifications

Table 24. J5 connector pinout
Pin
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39

Signal name
NC
NC
AGND
XDAC0
XDAC1
AGND
NC
AGND
TTLTRG
XAPCR
GND
NC
+VO
NC
GND
TMR2
GND
TMR3
GND
NC

Pin description
No connection
No connection
Analog ground
Analog output 0
Analog output 1
Analog groundNo connection
Analog ground
External digital trigger input
External analog input scan clock
Digital groundNo connection
Power output
No connection
Digital ground
Timer output 2
Digital ground
Timer output 3
Digital groundNo connection

Pin
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40

Signal name
NC
NC
AGND
XDAC2
XDAC3
AGND
AGND
AGND
XDPCR
GND
GND
NC
NC
NC
NC
NC
NC
NC
NC
NC

Pin description
No connection
No connection
Analog ground
Analog output 2
Analog output 3
Analog ground
Analog ground
Analog ground
External analog output scan clock
Digital ground
Digital groundNo connection
No connection
No connection
No connection
No connection
No connection
No connection
No connection
No connection

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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