INA128 - Precision, 130-dB CMRR, 700-µA, Low-Power, Instrumentation Amplifier

The INA128 and INA129 are low-power, general purpose instrumentation amplifiers offeringexcellent accuracy. The versatile 3-op amp design and small size make these amplifiers ideal for awide range of applications. Current-feedback input circuitry provides wide bandwidth even at highgain (200 kHz at G = 100).

A single external resistor sets any gain from 1 to 10,000. The INA128 provides anindustry-standard gain equation; the INA129 gain equation is compatible with the AD620.

The INA12x is laser-trimmed for very low offset voltage (50 µV), drift (0.5 µV/°C) andhigh common-mode rejection (120 dB at G ≥ 100). The INA12x operates with power supplies as low as±2.25 V, and quiescent current is only 700 µA, ideal for battery-operated systems. Internal inputprotection can withstand up to ±40 V without damage.

The INA12x is available in 8-pin plastic DIP and SO-8 surface-mount packages, specifiedfor the –40°C to +85°C temperature range. The INA128 is also available in a dual configuration, theINA2128.

• Low Offset Voltage: 50 µV Maximum
• Low Drift: 0.5 µV/°C Maximum
• Low Input Bias Current: 5 nA Maximum
• High CMR: 120 dB minimum
• Inputs Protected to ±40 V
• Wide Supply Range: ±2.25 V to ±18 V
• Low Quiescent Current: 700 µA
• 8-Pin Plastic Dip, SO-8

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