INA121

® INA 121 INA121 INA 121 FET-Input, Low Power INSTRUMENTATION AMPLIFIER FEATURES q LOW BIAS CURRENT: ±4pA q LOW QUIESCENT CURRENT: ±450µA q LOW INPUT OFFSET VOLTAGE: ±200µV q LOW INPUT OFFSET DRIFT: ±2µV/°C q LOW INPUT NOISE: 20nV/√Hz at f = 1kHz (G =100) q HIGH CMR: 106dB q WIDE SUPPLY RANGE: ±2.25V to ±18V q LOW NONLINEARITY ERROR: 0.001% max q INPUT PROTECTION TO ±40V q 8-PIN DIP AND SO-8 SURFACE MOUNT DESCRIPTION The INA121 is a FET-input, low power instrumentation amplifier offering excellent accuracy. Its versatile three-op amp design and very small size make it ideal for a variety of general purpose applications. Low bias current (±4pA) allows use with high impedance sources. Gain can be set from 1V to 10,000V/V with a single external resistor. Internal input protection can withstand up to ±40V without damage. The INA121 is laser-trimmed for very low offset voltage (±200µV), low offset drift (±2µV/°C), and high common-mode rejection (106dB at G = 100). It operates on power supplies as low as ±2.25V (+4.5V), allowing use in battery operated and single 5V systems. Quiescent current is only 450µA. Package options include 8-pin plastic DIP and SO-8 surface mount. All are specified for the –40°C to +85°C industrial temperature range. APPLICATIONS q LOW-LEVEL TRANSDUCER AMPLIFIERS Bridge, RTD, Thermocouple q PHYSIOLOGICAL AMPLIFIERS ECG, EEG, EMG, Respiratory q HIGH IMPEDANCE TRANSDUCERS q CAPACITIVE SENSORS q MULTI-CHANNEL DATA ACQUISITION q PORTABLE, BATTERY OPERAT...