RCV420: Single Chip Precision 4-20mA Current Loop Receiver
RCV420 is a special function integrated circuit chip for 4-20mA current loop receiver. RCV420 provide complete 4-20mA to 0-5V conversion, with 0.1% overall accuracy, 86dB CMR, and ±40V common-mode input range. This IC chip is suitable for many applications:
- PROCESS CONTROL
- INDUSTRIAL CONTROL
- FACTORY AUTOMATION
- DATA ACQUISITION
- SCADA
- RTUs
- ESD
- MACHINE MONITORING
Here is the schematic diagram of the basic 4-20mA current loop receiver circuit using RCV420 ic chip:m
At full scale, the circuit cause only a 1.5V drop by its internal sense resistance, which is useful in loops containing extra instrument burdens or in intrinsically safe applications where transmitter compliance voltage is at a premium. The 10V reference provides a precise 10V output with a typical drift of 5ppm/°C, might be very useful for analog-to-digital conversion of the output. [Circuit’s schematic diagram source: Texas Instruments Application Notes]