INA128U Datasheet

Instrumentation Amplifiers


The INA128U and INA129 are low power, general purpose instrumentation amplifiers offering excellent accuracy. The versatile 3-op amp design and small size make them ideal for a wide range of applications. Current-feedback input circuitry provides wide bandwidth even at high gain (200kHz at G = 100). A single external resistor sets any gain from 1 to 10,000. The INA128U provides an industry-standard gain equation; the INA129 gain equation is compatible with the AD620. The INA128/INA129 is laser trimmed for very low offset voltage (50µV), drift (0.5µV/°C) and highcommon-mode rejection (120dB at G ≥ 100). It operates with power supplies as low as ±2.25V, and quiescent current is only 700µA—ideal for batteryoperated systems. Internal input protection can withstand up to ±40V without damage. The INA128U/INA129 is available in 8-pin plastic DIP and SO-8 surface-mount packages, specified for the –40°C to +85°C temperature range. The INA128 is also available in a dual configuration, the INA2128. INA128U Features • LOW OFFSET VOLTAGE: 50µV max• LOW DRIFT: 0.5µV/C max• LOW INPUT BIAS CURRENT: 5nA max• HIGH CMR: 120dB min• INPUTS PROTECTED TO 40V• WIDE SUPPLY RANGE: 2.25V to 18V• LOW QUIESCENT CURRENT: 700µA• 8-PIN PLASTIC DIP, SO-8 INA128U Applications • BRIDGE AMPLIFIER• THERMOCOUPLE AMPLIFIER• RTD SENSOR AMPLIFIER• MEDICAL INSTRUMENTATION• DATA ACQUISITION


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