Datasheet

Introduction and Warnings

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1 Introduction and Warnings

1.1 INA149

The INA149 is a precision unity-gain difference amplifier with a very high input common-mode voltage

range (±275 V). It is composed of a precision operational amplifier and an integrated thin-film resistor

network. The topology allows the device to buffer small differential signals in the presence of a large

common-mode voltage. The device is pin-compatible with the INA117 and other industry standard

devices. It is available in an SO-8 package.

1.2 INA149EVM

The INA149EVM is intended to provide basic functional evaluation of the INA149. It provides the following

features:

• Easy access to pertinent nodes with test points and terminal blocks

• Convenient input and output filtering

• Versatile pad for evaluation in current/sensing applications

• Reverse supply and overvoltage protection

• Advanced evaluation with prototype areas and SMA/SMB connector footprints

• Footprints for providing a flexible reference voltage

A picture of the INA149EVM is shown in Figure 1

Figure 1. INA149EVM

INA149EVM SBOU119–November 2011

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