IVC102 Datasheet | Burr-Brown

® SBFS009 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 Features q ON-CHIP INTEGRATING CAPACITORS q GAIN PROGRAMMED BY TIMING q LOW INPUT BIAS CURRENT: 750f A 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 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-patible 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. Ionization Chamber C3 60p F C2 30p F 4 C1 10p F S2 S1 1 Photodiode Analog Ground S1 S2 Logic Low closes switches V+ 14 10 VO V- Digital Ground ∫ V O= - 1...