8.3 Feature Description

The INA12x are low power, general-purpose instrumentation amplifiers offering excellent accuracy. The versatile

three-op-amp design and small size make the amplifiers an excellent choice for a wide range of applications.

Current-feedback input circuitry provides wide bandwidth, even at high gain. A single external resistor sets

any gain from 1 to 10,000. The INA12x are laser trimmed for very low offset voltage (25 μV typical) and high

common-mode rejection (93 dB at G ≥ 100). These devices operate with power supplies as low as ±2.25 V, and

a quiescent current of 2 mA, typically. The internal input protection can withstand up to ±40 V without damage,

as shown in Figure 7-10.

8.3.1 Noise Performance

The INA12x provide very low noise in most applications. Low-frequency noise is approximately 0.2 µVPP

measured from 0.1 to 10 Hz (G ≥ 100). This feature provides dramatically improved noise when compared

to state-of-the-art chopper-stabilized amplifiers.

1s/div

0.1 V/div

m

G ≥ 100

Figure 8-1. 0.1-Hz to 10-Hz Input-Referred Voltage Noise

8.4 Device Functional Modes

The INA12x have a single functional mode and operate when the power-supply voltage is greater than 4.5 V

(±2.25 V). The maximum power-supply voltage for the INA12x is 36 V (±18 V).

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INA128, INA129

SBOS051F – OCTOBER 1995 – REVISED MAY 2022

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