Conversor De 4-20Ma A 0-5Vdc

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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 qRTUs 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% overallconversion 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 referenceprovides 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 fB 14 Rcv Out 11 Ref Out 10 Ref fB 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
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©

1988 Burr-Brown Corporation

PDS-837E 1

Printed in U.S.A. October, 1997

RCV420

SBVS019

SPECIFICATIONS
ELECTRICAL
At T = +25°C and VS = ±15V, unless otherwise noted. RCV420KP, JP CHARACTERISTICS GAIN Initial Error Error—JP Grade vs Temp Nonlinearity(1) OUTPUT Rated Voltage (IO = +10mA, –5mA) Rated Current(EO = 10V) Impedance (Differential) Current Limit (To Common) Capacitive Load (Stable Operation) INPUT Sense Resistance Input Impedance (Common-Mode) Common-Mode Voltage CMR(2) vs Temp (DC) (TA = TMIN to TMAX) AC 60Hz OFFSET VOLTAGE (RTO)(3) Initial vs Temp vs Supply (±11.4V to ±18V) vs Time ZERO ERROR(4) Initial Initial—JP Grade vs Temp OUTPUT NOISE VOLTAGE fB = 0.1Hz to 10Hz fO = 10kHz DYNAMICRESPONSE Gain Bandwidth Full Power Bandwidth Slew Rate Settling Time (0.01%) VOLTAGE REFERENCE Initial Trim Range(5) vs Temp vs Supply (±11.4V to ±18V) vs Output Current (IO = 0 to +10mA) vs Time Noise (0.1Hz to 10Hz) Output Current POWER SUPPLY Rated Voltage Range(6) Quiescent Current (VO = 0V) TEMPERATURE RANGE Specification Operation Storage Thermal Resistance, θJA 9.99 ±4 5 0.0002 0.0002 15 5+10, –2 ±15 –5, +11.4 3 0 –25 –40 80 10 +10, –5 MIN TYP 0.3125 0.05 15 0.0002 12 0.01 +49, –13 1000 MAX UNITS V/mA % of span % of span ppm/°C % of span V mA Ω mA pF

0.15 0.25 0.002

74.25

75 200 80 76 80

75.75 ±40

70

Ω kΩ V dB dB dB mV µV/°C dB µV/mo % of span % of span ppm of span/°C µVp-p nV/√Hz kHz kHz V/µs µs

1 74 10 90 200 0.025 10 0.075 0.15

50 800 150 30 1.5 10 10.01V % ppm/°C %/V %/mA ppm/kHz µVp-p mA V V mA °C °C °C °C/W

±18 4 +70 +85 +85

NOTES: (1) Nonlinearity is the max peak deviation from best fit straight line. (2) With 0 source impedance on Rcv Com pin. (3) Referred to output with all inputs grounded including Ref In. (4) With 4mA input signal and Voltage Reference connected (includes VOS, Gain Error, and Voltage Reference Errors). (5)...