RCV420JP

® RCV 420 RCV420 Precision 4mA to 20mA CURRENT LOOP RECEIVER FEATURES q COMPLETE 4-20mA TO 0-5V CONVERSION q INTERNAL SENSE RESISTORS q PRECISION 10V REFERENCE q BUILT-IN LEVEL-SHIFTING q ±40V COMMON-MODE INPUT RANGE q 0.1% OVERALL CONVERSION ACCURACY q HIGH NOISE IMMUNITY: 86dB CMR APPLICATIONS q PROCESS CONTROL q INDUSTRIAL CONTROL q FACTORY AUTOMATION q DATA ACQUISITION q SCADA q RTUs q ESD q MACHINE MONITORING DESCRIPTION The RCV420 is a precision current-loop receiver designed to convert a 4–20mA input signal into a 0–5V output signal. As a monolithic circuit, it offers high reliability at low cost. The circuit consists of a premium grade operational amplifier, an on-chip precision resistor network, and a precision 10V reference. The RCV420 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 instrument burdens or in intrinsically safe applications where V+ 16 RCV420 300kΩ –In 1 RS 75Ω CT 2 RS 75Ω +In 3 300kΩ 100kΩ 13 Rcv Com 5 Ref Com 1.01kΩ +10V Ref 99kΩ V– 4 transmitter compliance voltage is at a premium. The 10V reference provides a precise 10V output with a typical drift of 5ppm/°C. The RCV420 is completely self-contained and offers a highly versatile function. No adjustments are needed for gain, offset, or CMR. This provides three important advantages over discrete, board-level designs: 1) lower initial design cost, 2) lower manufa...