FEATURES

LOW INPUT BIAS CURRENT: 3fA typ

BUFFERED GUARD DRIVE PINS

LOW OFFSET VOLTAGE: 2mV max

HIGH COMMON-MODE REJECTION:

84dB (G = 10)

LOW QUIESCENT CURRENT: 1mA

INPUT OVER-VOLTAGE PROTECTION: ±40V

APPLICATIONS

LABORATORY INSTRUMENTATION

pH MEASUREMENT

ION–SPECIFIC PROBES

LEAKAGE CURRENT MEASUREMENT

DESCRIPTION

The INA116 is a complete monolithic FET-input instrumentation

amplifier with extremely low input bias

current. Difet ® inputs and special guarding techniques

yield input bias currents of 3fA at 25°C, and only 25fA

at 85°C. Its 3-op amp topology allows gains to be set

from 1 to 1000 by connecting a single external resistor.

Guard pins adjacent to both input connections can be

used to drive circuit board and input cable guards to

maintain extremely low input bias current.

The INA116 is available in 16-pin plastic DIP and SOL-16

surface-mount packages, specified for the –40°C to +85°C

temperature range.