IVC102U

® IVC102 PRECISION SWITCHED INTEGRATOR TRANSIMPEDANCE AMPLIFIER APPLICATIONS q PRECISION LOW CURRENT MEASUREMENT q PHOTODIODE MEASUREMENTS q IONIZATION CHAMBER MEASUREMENTS q CURRENT/CHARGE-OUTPUT SENSORS q LEAKAGE CURRENT MEASUREMENT 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. V+ FEATURES q ON-CHIP INTEGRATING CAPACITORS q GAIN PROGRAMMED BY TIMING q LOW INPUT BIAS CURRENT: 750fA max q LOW NOISE q LOW SWITCH CHARGE INJECTION q FAST PULSE INTEGRATION q LOW NONLINEARITY: 0.005% typ q 14-PIN DIP, SO-14 SURFACE MOUNT 6 VB 5 Ionization Chamber IIN 4 3 2 S1 1 C1 C2 C3 30pF 60pF...