Thursday, June 28, 2012

INA121 FET-Input, Low Power Instrumentation Amplifier

INA121 FET-Input, Low Power Instrumentation Amplifier

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 with stand 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.

FEATURES
  • LOW BIAS CURRENT: ±4pA
  • LOW QUIESCENT CURRENT: ±450µA
  • LOW INPUT OFFSET VOLTAGE: ±200µV
  • LOW INPUT OFFSET DRIFT: ±2µV/°C
  • LOW INPUT NOISE:20nV/√Hz at f = 1kHz (G =100)
  • HIGH CMR: 106dB
  • WIDE SUPPLY RANGE: ±2.25V to ±18V
  • LOW NONLINEARITY ERROR: 0.001% max
  • INPUT PROTECTION TO ±40V
  • 8-PIN DIP AND SO-8 SURFACE MOUNT


APPLICATIONS
  • LOW-LEVEL TRANSDUCER AMPLIFIERS Bridge, RTD, Thermocouple
  • PHYSIOLOGICAL AMPLIFIERS ECG, EEG, EMG, Respiratory
  • HIGH IMPEDANCE TRANSDUCERS
  • CAPACITIVE SENSORS
  • MULTI-CHANNEL DATA ACQUISITION
  • PORTABLE, BATTERY OPERATED SYSTEMS
  • GENERAL PURPOSE INSTRUMENTATION