USB-2020

12-bit, Ultra High-Speed Simultaneous USB Device

User's Guide

May 2021. Rev 4© Measurement Computing Corporation

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HM USB-2020.docx

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-2020 .................................................................................................................. 6
Functional block diagram .............................................................................................................................. 6
Chapter 2

Installing the USB-2020 ...................................................................................................................... 7
Unpacking ..................................................................................................................................................... 7
Installing the software.................................................................................................................................... 7
Installing the hardware .................................................................................................................................. 7
Connecting the external power supply ................................................................................................................................... 7
Connecting the USB-2020 ...................................................................................................................................................... 7

Calibrating the hardware................................................................................................................................ 8
Board connections ......................................................................................................................................... 9
Cabling ..................................................................................................................................................................................... 9

Chapter 3

Functional Details ............................................................................................................................. 11
Analog input acquisition modes ................................................................................................................... 11

Software paced ...................................................................................................................................................................... 11
Continuous scan (hardware paced) ....................................................................................................................................... 11
BURSTIO .............................................................................................................................................................................. 11

Board components ....................................................................................................................................... 12

BNC connectors .................................................................................................................................................................... 12
Status LEDs ........................................................................................................................................................................... 12
USB connector....................................................................................................................................................................... 12External power connector ..................................................................................................................................................... 12
40-pin IDC auxiliary connector (J9) ..................................................................................................................................... 13

Signal connections ....................................................................................................................................... 14

Analog input .......................................................................................................................................................................... 14External clock I/O ................................................................................................................................................................. 15
Digital I/O .............................................................................................................................................................................. 15
Trigger input .......................................................................................................................................................................... 16

Mechanical drawing .................................................................................................................................... 17
Chapter 4

Specifications.................................................................................................................................... 18
Analog input ................................................................................................................................................ 18

Accuracy ................................................................................................................................................................................ 19
Noise performance ................................................................................................................................................................ 19

Analog input calibration .............................................................................................................................. 19
Digital input/output ..................................................................................................................................... 20
External trigger............................................................................................................................................ 21
External clock input/output .......................................................................................................................... 21
Memory ....................................................................................................................................................... 21
Power .......................................................................................................................................................... 22
Environmental ............................................................................................................................................. 22
Mechanical .................................................................................................................................................. 223

USB-2020 User's Guide

USB ............................................................................................................................................................ 22
Signal I/O connectors .................................................................................................................................. 23

BNC connectors .................................................................................................................................................................... 23
Auxiliary connector J9 .......................................................................................................................................................... 23

4

Preface

About this User's Guide
What you will learn from this user's guideThis user's guide describes the Measurement Computing USB-2020 data acquisition device and lists device
specifications.

Conventions in this user's guide
For more information
Text presented in a box signifies additional information and helpful hints related to the subject matter you arereading.
Caution! Shaded caution statements present information to help you avoid injuring yourself and others,
damaging your hardware, or losing your data.
bold text

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

italic text

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

Where to find more information
Additional information about USB-2020 hardware is available on our website at www.mccdaq.com. You canalso contact Measurement Computing Corporation with specific questions.


Knowledgebase: kb.mccdaq.com
Tech support form: www.mccdaq.com/support/support_form.aspx
Email: techsupport@mccdaq.com
Phone: 508-946-5100 and follow the instructions for reaching Tech Support

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

5Chapter 1

Introducing the USB-2020

The USB-2020 is a high-speed data acquisition USB board supported under the Windows® operating system.
The USB-2020 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-2020 device provides the following features:











two 20 MS/s analog inputs
o simultaneous samplingo 1 A/D per channelo 12-bit resolution
o ±10 V, ±5 V, ±2 V, ±1 V voltage ranges (software-selectable)o 17 MHz input bandwidth
64 megasample onboard memoryo 40 MS/s overall rate to onboard memory when acquiring from both channels (20 MS/s per channel)o 8 MS/s throughput to host computer
Analog and digital triggering (level and edge)
Analog and digital gating
Eight digital I/O lines
Internal or external pacing of analog scans
Eight digital I/O lines
BNC connectors and 40-pin auxiliary connector for signal connections

Functional block diagram
USB-2020 functions are illustrated in the block diagram shown here.

Figure 1. Functional block diagram

6

Chapter 2

Installing the USB-2020
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-2020 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-2020 is installed with the software. Therefore, you need to install thesoftware package you plan to use before you install the hardware.

Installing the hardware
Before you connect the USB-2020 to your computer, connect the external power supply that was shipped withthe device.
Disconnect USB, then power supply
When disconnecting the USB-2020, disconnect the USB cable first, and then disconnect the power supply.

Connecting the external power supply
Refer to Figure 4 on page 12 for the location of the connectors and LEDs mentioned in the following procedure.
Power to the USB-2020 is provided with the 9 VDC external power supply (CB-PWR-9). Connect the external
power supply before connecting the USB cable to the USB-2020 and your computer.
Complete the following steps to connect the power supply to the USB-2020:
1.

Connect the external power cord to the USB-2020-power connector.

2.

Plug the power supply into a power outlet.

The top (Device Ready) LED is on (blue) when 9 VDC power is supplied the USB-2020 and a USB connection
is established. If the voltage supply is less than 7.3 V and/or a USB connection is not established, the Device
Ready LED is off.

Connecting the USB-2020
Complete the following steps to connect the USB-2020 to your system:
1.

Connect the USB cable that was shipped with the device to the USB connector on the USB-2020.
The USB cable supplied with the USB-2020 has a higher gauge wire (24 AWG minimum VBUS/GND,
28 AWG minimum D+/D–) than generic USB cables, and is required for proper enumeration of theUSB-2020.

2.

Connect the other end of the USB cable to a USB port on your computer or to an external USB hub that isconnected to your computer. The bottom (USB Activity) LED turns on. The USB cable only provides
communication to the USB-2020.

7

USB-2020 User's Guide

Installing the USB-2020

If you are running Windows XP and connect the device to a USB 1.1 port, a message displays Your USB
device can perform faster if you connect to a USB 2.0 port. You can ignore this message. The
USB-2020 functions properly when connected to a USB 1.1 port, although USB bandwidth is limited.

If the Device Ready LED turns off
If communication is lost between the device and the computer, the Device Ready LED turns off. Disconnect
the USB cable from the computer and then reconnect it. This should restore communication, and the Device
Ready LED should turn on.
If your system does not detect the USB-2020
If a USB device not recognized message appears when you connect the USB-2020, complete the following
steps:
1.

Unplug the USB cable from the USB-2020.

2.

Unplug the external power cord from the power connector.

3.

Plug the external power cord back into the power connector.

4.

Plug the USB cable back into the USB-2020.

Your system should now properly detect the USB-2020 hardware. Contact technical support if your system still
does not detect the USB-2020.
Removing USB-2020 boards from Windows XP systems
Device Manager may require up to 30 seconds to detect the removal of a USB-2020 board from a Windows XP
system with Service Pack 2 installed. This time increases with each additional connected device. If you remove
four devices from your system, the time required for Device Manager to update may be almost two minutes.
If you re-attach the USB-2020 to your system before Device Manager updates, the bottom LED does not turnon. Your system does not detect new hardware until Device Manager first detects that hardware has been
removed. InstaCal software is unresponsive during this re-detection time. Wait until Device Manager updates
with the new hardware before running InstaCal. The USB-2020 is detected by the system when the top (Device
Ready) LED is on.

Calibrating the hardware
The Measurement Computing Manufacturing Test department performs the initial factory calibration. The
calibration coefficients are stored in non-volatile RAM.
You can use InstaCal to recalibrate the USB-2020. No external equipment or user adjustments are required. At
run time, the calibration factors are loaded into system memory and are automatically retrieved each time a
different ADC range is specified. A full calibration typically takes less than two minutes.
Before you calibrate the device, turn your computer on and allow at least 30 minutes for the surrounding
temperature to stabilize. For best results, calibrate the device immediately before making critical measurements.
The high-resolution analog components on the board are sensitive to temperature. Pre-measurement calibration
insures that your device is operating with optimum calibration values.

8USB-2020 User's Guide

Installing the USB-2020

Board connections
The table below lists the board connector types, applicable cables, and compatible products for the USB-2020.
Board connectors, cables, accessory equipment
Parameter

Specification

Connector types

Compatible cable for the BNC
connectors
Compatible cables for the
40-pin IDC connector
Compatible accessory products
using the C40FF-x cableCompatible accessory products
using the C40-37F-x cable

Four standard BNC female connectors for analog input, clock I/O, and digital trigger
input
 40-pin IDC connector
Standard BNC cable
C40FF-x: 40-conductor ribbon cable, female both ends, x = length in feet.
C40-37F-x: 40-pin IDC to 37-pin female D connector, x = length in feet.
CIO-MINI40
CIO-MINI37
SCB-37

Cabling
You can use the CIO-MINI40 screw terminal board and C40FF-x cable for signal connections and termination.
The red stripe
identifies pin # 1

2

1

40

39

2

1

40

39

40-pin Female
IDC Connector

40-pin Female
IDC Connector

Figure 2. C40FF-x cable

You can use the C40-37F-x or C40F-37M-x cable for connections to 37-pin connectors or boards.

2

1

40

39

The red stripe
identifies pin # 1

1

1940-pin Female
IDC Connector

20

3737-pin Female
Dsub Connector

Figure 3. C40-37F-x cable9USB-2020 User's Guide

Installing the USB-2020

Field wiring, signal termination and conditioning
You can use the 40-pin CIO-MINI40 universal screw terminal board to terminate field signals and route theminto the USB-2020 using the C40FF-x cable:
You can use the following MCC screw terminal boards to terminate field signals and route them into theUSB-2020 using the C40-37F-x cable directly:CIO-MINI37 – 37-pin universal screw terminal board.
SCB-37 – 37-conductor, shielded signal connection/screw terminal box.

10

Chapter 3

Functional Details
Analog input acquisition modes

The USB-2020 can acquire analog input data in three different modes – software paced, continuous scan
(hardware paced), and BURSTIO.

Software paced
In software paced mode, you can acquire one analog sample at a time. You initiate the A/D conversion bycalling a software command. The analog value is converted to digital and returned to the computer. You repeat
this procedure until you have the total number of samples that you want from one channel.
The typical throughput sample rate in software paced mode is 4 kS/s (system-dependent).

Continuous scan (hardware paced)
Continuous scan mode enables data to be directly transferred to the host computer during acquisition. The
maximum rate in continuous scan mode is 8 MS/s for all acquired data (one channel or two channels). The
maximum rate achieved depends on the host computer.

BURSTIO
When using BURSTIO, the USB-2020 can acquire data at the maximum rate of 20 MS/s per channel to theinternal memory buffer (up to 64 megasamples) 1. The acquired data is read from the FIFO and transferred to auser buffer in the computer. You can initiate a single acquisition sequence of one to two channels with either asoftware command or an external hardware trigger event.
When BURSTIO is enabled, scans are limited to the depth of the onboard memory, as the data is acquired at a
rate faster than it can be transferred to the computer. Time must be allowed between scans for the acquisition
and the transfer of the data.

1 In some situations, the available memory is restricted below 64 megasamples. Refer to Buffer size limitations on Windows

systems on page 15 for more information.

11

USB-2020 User's Guide

Functional Details

Board components

Figure 4. USB-2020 components
1

USB connector

42External power connector

5340-pin IDC auxiliary
connector

6

Clock I/O BNC connector(CLK IO)
External digital trigger input
BNC connector (TRIG IN)
Analog input channel 1 BNC
connector (CH1)789

Analog input channel 0 BNC
connector (CH0)

USB Activity LED

Device Ready LED

BNC connectors
The USB-2020 has four BNC connectors that provide connections for the following signals:Two single-ended analog inputs
One external digital trigger input
One clock input/output

The external digital trigger input signal is also available on the 40-pin IDC connector.

Status LEDs
The Device Ready LED turns on after the device is enumerated by the system and is associated with ahardware driver.
The USB Activity LED turns on when the USB-2020 is transmitting or receiving data.

USB connector
The USB connector provides power to the USB-2020 and communication with the host computer.

External power connector
The USB-2020 requires external power. Connect the CB-PWR-9 power supply to the external power connector.
This power supply provides 9 VDC, 15 A power, and plugs into a standard 120 VAC outlet.

12USB-2020 User's Guide

Functional Details

40-pin IDC auxiliary connector (J9)The 40-pin auxiliary connector provides the following connections for all I/O signals except for analog input
and clock I/O:

Eight digital I/O (DIO0 to DIO7)
Digital trigger input (TRIG IN)
12 ground connections (GND)
Two +5V power outputs (+VO)

The signals that are available on the 40-pin IDC connector are listed below. Connect signals on the 40-pin IDC
connector using a C40FF-x cable or C40-37F-x cable.
40-pin IDC connector pinout
Pin Description
GroundGroundDigital I/O bit 7
Digital I/O bit 6
Digital I/O bit 5
Digital I/O bit 4
Digital I/O bit 3
Digital I/O bit 2
Digital I/O bit 1
Digital I/O bit 0
GroundDo not connect
GroundDo not connect
GroundDo not connect
GroundPower output
GroundDo not connect

Signal Name
GND
GND
DIO7
DIO6
DIO5
DIO4
DIO3
DIO2
DIO1
DIO0
GND
N/C
GND
N/C
GND
N/C
GND
+VO
GND
N/C

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

•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•

•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•

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

13

Signal Name
+VO
N/C
N/C
N/C
TRIG IN
GND
GND
GND
GND
GND
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C

Pin Description
Power output
Do not connect
Do not connect
Do not connect
External digital trigger input
GroundGroundGroundGroundGroundDo not connect
Do not connect
Do not connect
Do not connect
Do not connect
Do not connect
Do not connect
Do not connect
Do not connect
Do not connect

USB-2020 User's Guide

Functional Details

40-pin to 37-pin signal mapping
Signal mapping on the C40-37F-x cable is not a one-to-one ratio. The table below lists the signals on the 40-pin
end and the associated signals on the 37-pin end.
Signal mapping on the C40-37F-x cable
40-pin cable end
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40

37-pin cable end

Signal Name
GND
+VO
GND
N/C
DIO7
N/C
DIO6
N/C
DIO5
TRIG IN
DIO4
GND
DIO3
GND
DIO2
GND
DIO1
GND
DIO0
GND
GND
N/C
N/C
N/C
GND
N/C
N/C
N/C
GND
N/C
N/C
N/C
GND
N/C
+VO
N/C
GND
N/C
N/C
N/C

Pin
1
20
2
21
3
22
4
23
5
24
6
25
7
26
8
27
9
28
10
29
11
30
12
31
13
32
14
33
15
34
16
35
17
36
18
37
19

Signal Name
GND
+VO
GND
N/C
DIO7
N/C
DIO6
N/C
DIO5
TRIG IN
DIO4
GND
DIO3
GND
DIO2
GND
DIO1
GND
DIO0
GND
GND
N/C
N/C
N/C
GND
N/C
N/C
N/C
GND
N/C
N/C
N/C
GND
N/C
+VO
N/C
GND

Signal connections
Analog input
The USB-2020 has two single-ended simultaneous sampling analog inputs that provide sampling at rates of up
to 20 MS/s to internal memory when using BURSTIO and at rates of up to 8 MS/s (system-dependent) to thehost computer in continuous scan mode. The input ranges are software-selectable for ±10 V, ±5 V, ±2 V, ±1 V.
When using BURSTIO, the internal memory can store up to 64 megasamples at the maximum rate for transfer
to the computer after the acquisition is complete. Data is transferred to the host computer at a maximum rate of
8 MS/s (system-dependent).

14

USB-2020 User's Guide

Functional Details

Buffer size limitations on Windows systems
When creating very large buffers in Windows, you may receive the message "The requested amount of
Windows page-locked memory is not available" when you try to start a scan. This error occurs when there isenough memory to create the buffer, but the memory cannot be locked down. For example, the driver can only
lock a maximum buffer size of 67,107,800 bytes (33,553,900 samples) on Windows XP systems. A workaroundfor this is available when BURSTIO is enabled, allowing you to transfer the entire 64 MS of data from theonboard memory to the Windows buffer. Refer to the USB-2020 topic in the UL Help for more information.
You can pace analog input operations with the internal A/D clock or with an external clock source. When using
an external input scan clock, connect the clock source to the CLK IO BNC connector.
For more information about signal connections
For more information about signal connections, refer to the Guide to DAQ Signal Connections (available fordownload from www.mccdaq.com/support/DAQ-Signal-Connections.aspx.)

External clock I/O
USB-2020 analog input scanning operations can be paced with the internal A/D clock or with an external clock
source. The CLK IO connector can be configured through software for input (default) for external pacing, or for
output to pace a connected device.

Digital I/O
You can connect eight digital I/O lines to DIO0 through DIO7 on the 40-pin IDC connector. When a bit isconfigured for input, it can detect the state of any TTL-level input.
Digital input voltage ranges of up to 0 to 15 V are permitted, with thresholds of 0.8 V (low) and 2.0 V (high).
Each DIO channel is an open-drain, which can sink up to 150 mA for direct drive applications when used as an
output.
Figure 5 shows an example of a typical digital output connection.

Figure 5. Digital output connection

15

USB-2020 User's Guide

Functional Details

External pull-up capability
Inputs are pulled high by default to 5 V through 47 kΩ resistors on the circuit board. The pull-up voltage iscommon to all 47 kΩ resistors.
You can configure the pull-up/pull-down state by changing the placement of the shorting block located at thethree-pin header J10. Pull-up is the default factory configuration

Pull-up default configuration (factory default)

Pull-down configuration
Figure 6. Pull-up and pull-down jumper configurations (J10)

An external pull-up resistor can be used to pull the DIO bit up to a voltage that exceeds the internal 5 V pull-up
voltage (15 V maximum). Be aware that this would place the 47 k internal pull-up resistor in a parallel
resistance configuration that could offset the logic high voltage level.

Figure 7. Digital I/O external resistor configuration

Trigger input
Both the TRIG IN BNC connector and the TRIG IN IDC pin are external digital trigger/gate inputs that you canconfigure through software.
An analog scan can have a trigger or a gate, but not both. For example, you cannot use an analog trigger and use
the TRIG IN BNC connector to gate at the same time.
A trigger or gate can be digital or analog.


Digital triggers can be configured for rising or falling edge, or for high or low level.
16

USB-2020 User's Guide

Functional Details

Analog triggers can be configured for software-selectable high or low level, or for rising or falling edge
with software-selectable hysteresis.
Digital gates can be configured for high or low level.
Analog gates can be configured for software-selectable high or low level, or for in or out of softwareselectable window.

Each configuration is explained below:High or low level  Trigger or gate an acquisition when an input signal is higher or lower than thespecified voltage.
Rising or falling edge  Trigger an acquisition when input signals cross a specified voltage (rising or
falling)
Window  Gate an acquisition when the input signal is within or outside two specified voltages (in/out of
window)
Hysteresis  After the input signal has passed through one specified voltage, trigger an acquisition when
the input signal passes through a second voltage (positive or negative). For example, once the signal goes
below 5 V, a rising edge that crosses 4 V must occur to trigger an acquisition.

Mechanical drawing

Figure 8. USB-2020 circuit board dimensions

17

Chapter 4

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

Analog input
Table 1. Analog input specifications
Parameter
A/D converter type
Number of channels
Resolution
Input configuration
Sampling method
Input ranges
Connection type
Input coupling
Absolute maximum input
voltage
Input impedance
Input leakage current
Input bandwidth (3 dB)
Crosstalk
Trigger source

Condition

Specification
AD92252
12-bits
Single-ended, individual A/D per channel
Simultaneous±10 V, ±5 V, ±2 V, ±1 V, software-selectable
BNC
DC±15 V max (power on)
1.5 MΩ typ
2 uA typ, 10 uA max
17 MHz typ–90 dB
TRIG IN (BNC connector and 40-pin connector)
See External trigger for more information
CH0 or CH1

All input ranges
DC to 10 kHz
DigitalAnalogSample clock source

Internal
External

Throughput

Software paced
Continuous scan
BURSTIO

Data transfer rate
Signal-to-noise ratio (SNR)
Signal-to-noise and distortion
ratio (SINAD)
Spurious free dynamic range(SFDR)
Total harmonic distortion(THD)

From onboard memory

1 kHz to 20 MHz max
CLK IO (BNC connector)
See External clock input/output for more information
33 S/s to 4 kS/s typ; system-dependent
1 kS/s to 8 MS/s, system-dependent
1 kS/s to 20 MS/s to 64 MS onboard memory
10 MS/s typ
66.6 dB
66.5 dB
80 dB
80 dB

18

USB-2020 User's Guide

Specifications

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

Gain error(% of reading)

Offset error(mV)

INL error(% of range)

Absolute
accuracy at
Full Scale
(mV)

Gain
temperature
coefficient(% reading/°C)

Offsettemperature
coefficient(µV/°C)

±10 V
±5 V

0.11
0.11

5.2
5.2

0.0976
0.0488

35.72
20.46

0.00350.0035

30
110

±2 V
±1 V

0.11
0.11

1.1
1.1

0.02440.01228.18
4.64

0.00350.003510
25

Noise performance
For the peak-to-peak noise distribution test, a single-ended input channel is connected to AGND at the input
BNC connector and 20,000 data samples are acquired at the maximum rate.
Table 3. Noise performance specifications
Range

Counts

LSBrms

±10 V
±5 V
±2 V
±1 V

5
5
7
7

0.76
0.76
1.06
1.06

Analog input calibration
Table 4. Analog input calibration specifications
Parameter

Specification

Recommended warm-up time
Calibration method

15 minutes min
Self calibration, with calibration factors for each range stored onboard in non-volatilememory1 year (factory calibration)

Calibration interval

19USB-2020 User's Guide

Specifications

Digital input/output
Table 5. Digital I/O specifications
Parameter

Specification

Digital type
Number of I/O
Configuration

CMOS
8
Each bit can be independently configured as input (power on default) or output
Input bits can be read at any time whether the digital output is active or tri-stated.
0 V to 15 V
47 kΩ pull-up/pull-down resistor, 28 kΩ series resistor+20 V max
The port has 47 kΩ resistors that can be configured as pull-up or pull-down with aninternal jumper. The factory configuration is pull-up (J10 shorting block default positionis pins 1 and 2). Pull down capability is available by placing the J10 shorting block acrosspins 2 and 3.
33 S/s to 4,000 S/s typ; system-dependent

Input voltage range
Input characteristics
Abs. Maximum input voltage
Pull-up/pull-down
configuration
Digital I/O transfer rate
(software paced)
Input high voltage
Input low voltage
Output characteristics
Output voltage range
Drain to source breakdown
voltage
Off state leakage current
Sink current capability
DMOS transistor onresistance (drain to source)
Note 1:
Note 2:

2.0 V min
0.8 V max
47 kΩ pull-up, open drain (DMOS transistor, source connected to ground)
0 V to 5 V (using 47 kΩ internal pull up resistors)
0 V to 15 V max through optional, user-supplied external pull-up resistors (Note 1)
42.5 V min (Note 2)
1.0 µA 150 mA max (continuous) per output pin
 150 mA max (continuous), total for all eight channels
4Ω

Adding external pull-up resistors connects the output bit in parallel with the internal 47 kΩ pull-up resistor. The
resulting load voltage depends on the value of the external resistor value and the pull-up voltage used. In
general, external 10 KΩ pull-up resistors are sufficient for most applications.
Does not include the additional leakage current contribution that can occur when using an external pull-up
resistor.

20

USB-2020 User's Guide

Specifications

External trigger
Table 6. External trigger specifications
Parameter

Condition

Specification

Trigger source

DigitalAnalogDigitalAnalog

TRIG IN (BNC connector and 40-pin connector)
CH0 or CH1
Rising or falling edge, high or low level
Trigger above or below software-selectable level, rising or falling edge
with software-selectable hysteresis
TRIG IN (BNC connector and 40-pin connector)
CH0 or CH1
High or low level

Trigger mode

A/D gate source
A/D gate modes

DigitalAnalogDigitalAnalog

Trigger latency
Trigger pulse width
Input type
Input high voltage threshold
Input low voltage threshold
Input voltage range

Software-selectable high or low level, in or out of software-selectablewindow
50 ns max
25 ns min49.9 Ω series resistor
2.0 V min
0.8 V max
-0.5 V to 6.5 V

DigitalDigitalDigitalDigitalExternal clock input/output
Table 7. External clock I/O specifications
Parameter

Specification

Terminal nameTerminal type
Terminal description

CLK IO (BNC connector)
ADC clock input/output, software-selectable for input or output (default is input)
 When configured for input, receives sampling clock from external source When configured for output, outputs the internal sampling clock
1 kHz to 20 MHz max±50 ppm
1 MΩ
20 MHz-0.5 V to 5.5 V
25 ns min49.9 Ω series resistor
2.0 V min
0.8 V max
3.8 V min
0.6 V max
±8 mA max

Clock rate
Stability
Input impedance
Maximum rate
Input range
Clock pulse width
Input type
Input high voltage threshold
Input low voltage threshold
Output high voltage
Output low voltage
Output current

MemoryTable 8. Memory specifications
Parameter

Specification

Data FIFO
Non-volatile memory

64 MS using BURSTIO, 4 kS not using BURSTIO
32 KB (30 KB firmware storage, 2 KB calibration/user data)21

USB-2020 User's Guide

Specifications

Power
Table 9. Power specifications
Parameter

Specification

Supply voltage
Supply current
Power jack configuration
Power jack barrel diameter
Power jack pin diameter
Power jack polarity+VO voltage range+VO current sourcing

9 VDC to 18 VDC; MCC plug-in power supply CB-PWR-9 recommended
0.75 A max (Note 3)
Two conductor, barrel
6.3 mm
2.0 mmCenter positive
4.50 V to 5.25 V
10 mA max

Note 3: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 or the +VO pin.

Environmental
Table 10. Environmental specifications
Parameter

Specification

Operating temperature range
Storage temperature range
Humidity

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

Mechanical
Table 11. Mechanical specifications
Parameter

Specification

Dimensions (L × W × H)
Weight142.24 × 180.34× 38.09 mm (5.6 × 7.1 × 1.5 in.)
1.5 lbUSB
Table 12. USB specifications
Parameter

Specification

USB device type
Device compatibility
USB cable type

USB 2.0 (high-speed)
USB 2.0
A-B cable, UL type AWM 2527 or equivalent. (min 24 AWG VBUS/GND,
min 28 AWG D+/D–)
3 m (9.84 ft) max

USB cable length22

USB-2020 User's Guide

Specifications

Signal I/O connectors
Table 13. Connector specifications
Connector

Specification

USB
Auxiliary connector (J9)Compatible cables for the
40-pin auxiliary connector

B type40-pin header connector
 C40FF-x
 C40-37F-x
CIO-MINI40

Compatible accessory productswith the C40FF-x cableCompatible accessory productswith the C40-37F-x cable

CIO-MINI37
SCB-37

BNC connectors
Table 14. BNC connector pinout
BNC signal nameSignal description

CH0
CH1
TRIG IN

Analog input channel 0
Analog input channel 1
BNC connection for external digital trigger (Note 4)
BNC connection for the ADC clock input/output, software-selectable for input or
output (default is input)

CLK IO
Note 4:

Also available on auxiliary connector J9.

Auxiliary connector J9
Table 15. 40-pin connector J9 pinout
Pin
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39

Note 5:Signal name
GND
GND
DIO7
DIO6
DIO5
DIO4
DIO3
DIO2
DIO1
DIO0
GND
N/C
GND
N/C
GND
N/C
GND
+VO
GND
N/C

Pin description
GroundGroundDigital I/O bit 7
Digital I/O bit 6
Digital I/O bit 5
Digital I/O bit 4
Digital I/O bit 3
Digital I/O bit 2
Digital I/O bit 1
Digital I/O bit 0
GroundDo not connect
GroundDo not connect
GroundDo not connect
GroundPower output
GroundDo not connect

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

N/C = no connection, not used

23

Signal name
+VO
N/C
N/C
N/C
TRIG IN
GND
GND
GND
GND
GND
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C

Pin description
Power output
Do not connect
Do not connect
Do not connect
External digital trigger input
GroundGroundGroundGroundGroundDo not connect
Do not connect
Do not connect
Do not connect
Do not connect
Do not connect
Do not connect
Do not connect
Do not connect
Do not connect

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