XR620A

Instrumentation Amplifier

© 2013-2015 Exar Corporation

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exar.com/XR620A

Rev 1B

FEATURES

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±2.3V to ±18V supply voltage range

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Gain range of 1 to 10,000

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Gain set with one external resistor

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±125μV maximum input offset voltage

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0.1μV/°C input offset drift

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700kHz bandwidth at G = 1

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1.2V/μs slew rate

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90dB minimum CMRR at G = 10

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2.2mA maximum supply current

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6.6nV/√Hz input voltage noise

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70nV/√Hz output voltage noise

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DIP-8 or Pb-free SOIC-8

APPLICATIONS

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Bridge amplifier

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Weigh scales

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Thermocouple amplifier

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ECG and medical instrumentation

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MRI (Magnetic Resonance Imaging)

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Patient monitors

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Transducer interface

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Data acquisition systems

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Strain gauge amplifier

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Industrial process controls

General Description

The XR620A is a low power, general purpose instrumentation amplifier

with a gain range of 1 to 10,000. The XR620A is offered in 8-lead SOIC or

DIP packages and requires only one external gain setting resistor making

it smaller and easier to implement than discrete, 3-amp designs.

While consuming only 2.2mA of supply current, the XR620A offers a low

6.6nV/Hz input voltage noise and 0.2μVpp noise from 0.1Hz to 10Hz.

The XR620A offers a low input offset voltage of ±125μV that only varies

0.1μV/°C over it’s operating temperature range of -40°C to +85°C. The

XR620A also features 50ppm maximum nonlinearity. These features

make it well suited for use in data acquisition systems.

Typical Application

2

1

8

3

4

7

6

5

XR620A

–Input

To Power

Supply Ground

Reference

+Input

Load

Thermocouple Amplifier

Competitive Plot

-7

-6

-5

-4

-3

-2

-1

0

1

2

3

0.0001

0.001

0.01

0.1

1

10

Frequency (MHz)

XR620A

Competitor A

G = 1

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