APPLICATIONS

PRECISION LOW CURRENT MEASUREMENT

PHOTODIODE MEASUREMENTS

IONIZATION CHAMBER MEASUREMENTS

CURRENT/CHARGE-OUTPUT SENSORS

LEAKAGE CURRENT MEASUREMENT

FEATURES

ON-CHIP INTEGRATING CAPACITORS

GAIN PROGRAMMED BY TIMING

LOW INPUT BIAS CURRENT: 750fA max

LOW NOISE

LOW SWITCH CHARGE INJECTION

FAST PULSE INTEGRATION

LOW NONLINEARITY: 0.005% typ

14-PIN DIP, SO-14 SURFACE MOUNT

DESCRIPTION

The IVC102 is a precision integrating amplifier with

FET op amp, integrating capacitors, and low leakage

FET switches. It integrates low-level input current for

a user-determined period, storing the resulting voltage

on the integrating capacitor. The output voltage can be

held for accurate measurement. The IVC102 provides

a precision, lower noise alternative to conventional

transimpedance op amp circuits that require a very

high value feedback resistor.

The IVC102 is ideal for amplifying low-level sensor

currents from photodiodes and ionization chambers.

The input signal current can be positive or negative.

TTL/CMOS-compatible timing inputs control the integration

period, hold and reset functions to set the

effective transimpedance gain and to reset (discharge)

the integrator capacitor.

Package options include 14-Pin plastic DIP and SO-14

surface-mount packages. Both are specified for the

–40°C to 85°C industrial temperature range.