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The RCV420 is a precision current-loop receiver de-signed to convert a 4–20mA input signal into a 0–5Voutput signal. As a monolithic circuit, it offers highreliability at low cost. The circuit consists of a pre-mium grade operaTIonal amplifier, an on-chip precisionresistor network, and a precision 10V reference. TheRCV420 features 0.1% overall conversion accuracy,86dB CMR, and ±40V common-mode input range.The circuit introduces only a 1.5V drop at full scale,which is useful in loops containing extra instrumentburdens or in intrinsically safe applicaTIons wheretransmitter compliance voltage is at a premium. The10V reference provides a precise 10V output with atypical drift of 5ppm/°C.The RCV420 is completely self-contained and offers ahighly versaTIle funcTIon. No adjustments are neededfor gain, offset, or CMR. This provides three importantadvantages over discrete, board-level designs: 1) lowerinitial design cost, 2) lower manufacturing cost, and3) easy, cost-effective field repair of a precision circuit.
