RCV420 4～20mA Precision Current Loop Receiver

RCV420 is a precision current loop receiver designed to convert an input 4-20mA current signal into an output 0-5V voltage. Its circuit consists of a high-quality op amp, an on-chip precision resistor network, and a 10V precision reference source. The total conversion accuracy is 0.1%, the high noise immunity CMR is 86dB, and the common mode input range is ±40V. When operating at the maximum calibration state, the voltage only drops .5V. This feature is very useful for intrinsic safety applications with additional loads in the loop or excess voltage at the transmitter. The 10V reference provides a 10V precision voltage output with a typical drift value of 5×10-6/oC. The equivalent circuit of RCV420 is shown in the figure.