Measurement Computing

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USB-2020

All specifications are subject to change without notice.

Typical at 25 °C unless otherwise specified.

Analog Input

A/D converter type: AD9225

Number of channels: 2

Resolution: 12-bits

Input configuration: Single-ended, individual A/D per channel

Sampling method: Simultaneous

Input ranges: ±10 V, ±5 V, ±2 V, ±1 V, software-selectable

Connection type: BNC

Input coupling: DC

Absolute maximum input voltage: ±15 V max (power on)

Input impedance: 1.5 MΩ typ

Input leakage current: 2 uA typ, 10 uA max

Input bandwidth (3 db): All input ranges, 17 MHz typ

Crosstalk: DC to 10 kHz, –90 dB

Trigger source

Digital: TRIG IN (BNC connector or 40-pin connector)

See External trigger for more information

Analog: CH0 or CH1

Sample clock source

Internal: 1 kHz to 20 MHz max

External: CLK IO (BNC connector)

See External clock input/output for more information

Throughput

Continuous scan: 1 kS/s min to 8 MS/s max to host computer (maximum rate

is system-dependent)

BURSTIO: 1 kS/s min to 20 MS/s max to 64 MS onboard memory

Signal-to-noise ratio (SNR): 66.6 dB

Signal-to-noise and distortion ratio (SINAD): 66.5 dB

Spurious free dynamic range (SFDR): 80 dB

Total harmonic distortion (THD): 80 dB

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.

Range

Counts

LSBrms

±10 V

5

0.76

±5 V

5

0.76

±2 V

7

1.06

±1 V

7

1.06

Analog Input Calibration

Recommended warm-up time: 15 minutes min

Calibration method: Self calibration, with calibration factors for each range stored

onboard in non-volatile memory

Calibration interval: 1 year (factory calibration)

Specifications

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)

Offset Temperature

Coefficient (µV/°C)

±10 V

0.11

5.2

0.0976

35.72

0.0035

30

±5 V

0.11

5.2

0.0488

20.46

0.0035

110

±2 V

0.11

1.1

0.0244

8.18

0.0035

10

±1 V

0.11

1.1

0.0122

4.64

0.0035

25

Digital Input/Output

Digital type: CMOS

Number of I/O: 8

Configuration: 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.

Input voltage range: 0 V to 15 V

Input characteristics: 47 kΩ pull-up/pull-down resistor, 28 kΩ series resistor

Abs. maximum input voltage: +20 V max

Pull-up/pull-down configuration: The port has 47 kΩ resistors that can be con-

figured as pull-up (default) or pull-down with an internal jumper.

Digital I/O transfer rate (softwarepaced): 33S/sto4,000S/styp;system-dependent

Input high voltage: 2.0 V min

Input low voltage: 0.8 V max

Output characteristics: 47 kΩ pull-up, open drain (DMOS transistor, source

connected to ground)

Output voltage range: 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

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.

Drain to source breakdown voltage: 42.5 V min (does not include the addi-

tional leakage current contribution that can occur when using an external

pull-up resistor)

Off state leakage current: 1.0 µA

Sink current capability: 150 mA max (continuous) per output pin; 150 mA max

(continuous), total for all eight channels

DMOS transistor on-resistance (drain to source): 4 Ω

External Trigger

Trigger Source

Digital: TRIG IN on BNC connector and 40-pin connector)

Analog: CH0 or CH1

Trigger mode

Digital: Rising or falling edge, high or low level

Analog: Trigger above or below software-selectable level, rising or falling edge

with software-selectable hysteresis

A/D gate source

Digital: TRIG IN (BNC connector and 40-pin connector)

Analog: CH0 or CH1

A/D gate modes

Digital: High or low level

Analog: Software-selectable high or low level, in or out of software-selectable

window

Trigger latency: 50 ns max

Trigger pulse width: 25 ns min

Input type: 49.9 Ω series resistor

Input high voltage: 2.0 V min

Input low voltage: 0.8 V max