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The ACF2101 is a dual switched integrator for preci-sion applicaTIons. Each channel can convert an inputcurrent to an output voltage by integraTIon, using eitheran internal or external capacitor. Included on the chipare precision 100pF integraTIon capacitors, hold andreset switches, and output mulTIplexers.As a complete circuit on a single chip, the ACF2101eliminates many of the problems commonly encoun-tered in discrete designs, such as leakage current errorsand noise pickup. The integrating approach can pro-vide lower noise than conventional transimpedanceamplifier designs and also eliminates the need for highperformance, high value feedback resistors.The extremely low bias current and low noise of theACF2101’s Difet® amplifiers, along with active la-ser trimming of both offset and drift, assure precisioncurrent to voltage conversion.Although designed for +5V, –15V supplies, theACF2101 can be operated on supplies up to ±18VDC.It is available in both 24-pin plastic DIP and SOICpackages.
