Datasheet

®
RCV420
1
RCV420
Precision 4mA to 20mA
CURRENT LOOP RECEIVER
APPLICATIONS
● PROCESS CONTROL
● INDUSTRIAL CONTROL
● FACTORY AUTOMATION
● DATA ACQUISITION
● SCADA
● RTUs
● ESD
● MACHINE MONITORING
FEATURES
● COMPLETE 4-20mA TO 0-5V CONVERSION
● INTERNAL SENSE RESISTORS
● PRECISION 10V REFERENCE
● BUILT-IN LEVEL-SHIFTING
●
±40V COMMON-MODE INPUT RANGE
● 0.1% OVERALL CONVERSION ACCURACY
● HIGH NOISE IMMUNITY: 86dB CMR
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 manufacturing cost, and
3) easy, cost-effective field repair of a precision circuit.
DESCRIPTION
The RCV420 is a precision current-loop receiver de-
signed 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 pre-
mium 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
®
R
S

75Ω
R
S

75Ω
1
2
3
–In
16 4 12
V+ V– Ref In
C
T
+In
100kΩ
RCV420
1.01kΩ
99kΩ
11.5kΩ
300kΩ
300kΩ
+10V
Ref
15
14
11
10
8
7
Rcv f
B

Rcv Out
Ref Out
Ref f
B

Ref Trim
Ref Noise Reduction
13 5
Rcv
Com
Ref
Com
92kΩ
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: [phone] • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: [phone] (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]
RCV420
©
1988 Burr-Brown Corporation PDS-837E Printed in U.S.A. October, 1997
SBVS019