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.