
Printed in U.S.A. October, 1997
RCV420
Precision 4mA to 20mA
CURRENT LOOP RECEIVER
APPLICATIONS
G
PROCESS CONTROL
G
INDUSTRIAL CONTROL
G
FACTORY AUTOMATION
G
DATA ACQUISITION
G
SCADA
G
RTUs
G
ESD
G
MACHINE MONITORING
FEATURES
G
COMPLETE 4-20mA TO 0-5V CONVERSION
G
INTERNAL SENSE RESISTORS
G
PRECISION 10V REFERENCE
G
BUILT-IN LEVEL-SHIFTING
G
±
40V COMMON-MODE INPUT RANGE
G
0.1% OVERALL CONVERSION ACCURACY
G
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
75
R
S
75
1
2
3
–In
16
4
12
V+
V–
Ref In
C
T
+In
100k
RCV420
1.01k
99k
11.5k
300k
300k
+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
92k
International Airport Industrial Park Mailing Address: PO Box 11400, Tucson, AZ 85734 Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 Tel: (520) 746-1111 Twx: 910-952-1111
Internet: http://www.burr-brown.com/ FAXLine: (800) 548-6133 (US/Canada Only) Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
RCV420
1988 Burr-Brown Corporation
PDS-837E