Burr-Brown, Texas Instruments INA121 pdf datasheet download

INA121

FET-Input, Low Power
INSTRUMENTATION AMPLIFIER

FEATURES
l LOW BIAS CURRENT: ±4pA
l LOW QUIESCENT CURRENT: ±450mA
l LOW INPUT OFFSET VOLTAGE: ±200mV
l LOW INPUT OFFSET DRIFT: ±2mV/°C
l LOW INPUT NOISE:
20nV/ÖHz at f = 1kHz (G =100)
l HIGH CMR: 106dB
l WIDE SUPPLY RANGE: ±2.25V to ±18V
l LOW NONLINEARITY ERROR: 0.001% max
l INPUT PROTECTION TO ±40V
l 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 (±200mV), low offset drift (±2mV/°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 450mA.
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

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

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