ACF2101BU

A dual switched integrator for precision applications. Each channel can convert an input current to an output voltage by integration, using either an internal or external capacitor. Included on the chip are precision 100pF integration capacitors, hold and reset switches, and output multiplexers. As a complete circuit on a single chip, it eliminates many of the problems commonly encountered in discrete designs, such as leakage current errors and noise pickup. The integrating approach can provide lower noise than conventional transimpedance amplifier designs and also eliminates the need for high performance, high value feedback resistors. The extremely low bias current and low noise of the Difet amplifiers, along with active laser trimming of both offset and drift, assure precision current to voltage conversion. Although designed for +5V, -15V supplies, it can be operated on supplies up to ±18VDC. It is available in both 24-pin plastic DIP and SOIC packages.

Applications

• CURRENT TO VOLTAGE CONVERSION
• PHOTODIODE INTEGRATOR
• CURRENT MEASUREMENT
• CHARGE MEASUREMENT
• CT SCANNER FRONT END
• MEDICAL, SCIENTIFIC, AND INDUSTRIAL INSTRUMENTATION

Key features

• INCLUDES INTEGRATION CAPACITOR, RESET AND HOLD SWITCHES, AND OUTPUT MULTIPLEXER
• LOW NOISE: 10μVrms
• LOW CHARGE TRANSFER: 0.1pC
• WIDE DYNAMIC RANGE: 120dB
• LOW BIAS CURRENT: 100fA