®
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 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
V+
16
RCV420
300kΩ
–In
1
R
S
75Ω
C
T
2
R
S
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 manufacturing cost, and
3) easy, cost-effective field repair of a precision circuit.
Ref In
12
92kΩ
11.5kΩ
15 Rcv f
B
14 Rcv Out
11 Ref Out
10 Ref f
B
8
7
Ref Trim
Ref Noise Reduction
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
®
©
1988 Burr-Brown Corporation
PDS-837E
1
Printed in U.S.A. October, 1997
RCV420
BURR-BROWN [ BURR-BROWN CORPORATION ]
