8 Detailed Description

8.1 Overview

The INA128 and INA129 (INA12x) instrumentation amplifiers are outfitted with an input protection circuit and

input buffer amplifiers. These features eliminate the need for input impedance matching and make the amplifier

an excellent choice for use in measurement and test equipment. Additional characteristics of the INA12x include

a very-low dc offset, low drift, low noise, very-high open-loop gain, very-high common-mode rejection ratio, and

very-high input impedances. The INA12x is used where great accuracy and stability of the circuit, both short and

long term, are required.

8.2 Functional Block Diagram

+

+

–IN

OUT

REF

+

+IN

Overvoltage

Protection

Overvoltage

Protection

INA128, INA129

SBOS051F – OCTOBER 1995 – REVISED MAY 2022

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