®
XTR114
XTR112
XTR112
XTR114
4-20mA CURRENT TRANSMITTERS with Sensor Excitation and Linearization
FEATURES
●LOW UNADJUSTED ERROR
●PRECISION CURRENT SOURCES XTR112: Two 250μA
XTR114: Two 100μA
●RTD OR BRIDGE EXCITATION
●LINEARIZATION
●TWO OR THREE-WIRE RTD OPERATION
●LOW OFFSET DRIFT: 0.4μV/°C
●LOW OUTPUT CURRENT NOISE: 30nAp-p
●HIGH PSR: 110dB min
●HIGH CMR: 86dB min
●WIDE SUPPLY RANGE: 7.5V TO 36V
●SO-14 SOIC PACKAGE
DESCRIPTION
The XTR112 and XTR114 are monolithic 4-20mA, two-wire current transmitters. They provide complete current excitation for high impedance platinum RTD temperature sensors and bridges, instrumentation amplifier, and current output circuitry on a single inte-
grated circuit. The XTR112 has two 250μA current sources while the XTR114 has two 100μA sources for
RTD excitation.
Versatile linearization circuitry provides a 2nd-order correction to the RTD, typically achieving a 40:1 improvement in linearity.
Instrumentation amplifier gain can be configured for a wide range of temperature or pressure measurements. Total unadjusted error of the complete current transmitter is low enough to permit use without adjustment in many applications. This includes zero output current drift, span drift and nonlinearity. The XTR112 and XTR114 operate on loop power supply voltages down to 7.5V.
Both are available in an SO-14 surface-mount package and are specified for the –40°C to +85°C indus-
trial temperature range.
APPLICATIONS
●INDUSTRIAL PROCESS CONTROL
●FACTORY AUTOMATION
●SCADA REMOTE DATA ACQUISITION
●REMOTE TEMPERATURE AND PRESSURE TRANSDUCERS
Pt1000 NONLINEARITY CORRECTION
USING XTR112 and XTR114
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(%) |
4 |
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3 |
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Uncorrected |
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Nonlinearity |
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2 |
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RTD Nonlinearity |
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1 |
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Corrected |
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Nonlinearity |
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0 |
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–1 |
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–200°C |
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+850°C |
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Process Temperature (°C) |
IR
IR |
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VLIN |
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VREG |
7.5V to 36V |
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+ |
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VPS |
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XTR112 |
4-20 mA |
R |
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VO |
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G |
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XTR114 |
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RTD |
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RL |
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– |
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XTR112: IR = 250 A
XTR114: IR = 100 A
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/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 •mmediateI Product Info: (800) 548-6132
®
© 1998 Burr-Brown Corporation |
PDS-1473A |
XTR112, XTR114 |
1998 |
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Printed in U.S.A. December, |
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SBOS101
SPECIFICATIONS
At TA = +25°C, V+ = 24V, and TIP29C external transistor, unless otherwise noted.
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XTR112U |
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XTR112UA |
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XTR114U |
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XTR114UA |
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PARAMETER |
CONDITIONS |
MIN |
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TYP |
MAX |
MIN |
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TYP |
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MAX |
UNITS |
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OUTPUT |
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Output Current Equation |
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IO = VIN • (40/RG) + 4mA, VIN in |
Volts, RG in Ω |
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A |
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Output Current, Specified Range |
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4 |
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20 |
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mA |
Over-Scale Limit |
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24 |
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27 |
30 |
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mA |
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Under-Scale Limit: XTR112 |
IREG = 0 |
0.9 |
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1.3 |
1.7 |
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mA |
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XTR114 |
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0.6 |
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1 |
1.4 |
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mA |
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ZERO OUTPUT(1) |
VIN = 0V, RG = ∞ |
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4 |
±25 |
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±50 |
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mA |
Initial Error |
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±5 |
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μA |
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vs Temperature |
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±0.07 |
±0.5 |
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±0.9 |
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μA/°C |
vs Supply Voltage, V+ |
V+ = 7.5V to 36V |
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0.04 |
0.2 |
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μA/V |
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vs Common-Mode Voltage |
VCM = 1.25V to 3.5V(2) |
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0.02 |
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μA/V |
vs VREG Output Current |
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0.3 |
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μA/mA |
Noise: 0.1Hz to 10Hz |
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0.03 |
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μAp-p |
SPAN |
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Span Equation (transconductance) |
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S = 40/RG |
±0.2 |
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±0.4 |
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A/V |
Initial Error (3) |
Full Scale (VIN) = 50mV |
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±0.05 |
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vs Temperature(3) |
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±3 |
±25 |
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ppm/°C |
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Nonlinearity: Ideal Input (4) |
Full Scale (V ) = 50mV |
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0.003 |
0.01 |
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% |
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IN |
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INPUT(5) |
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±50 |
±100 |
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±250 |
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μV |
Offset Voltage |
VCM = 2V |
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vs Temperature |
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±0.4 |
±1.5 |
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±3 |
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μV/°C |
vs Supply Voltage, V+ |
V+ = 7.5V to 36V |
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±0.3 |
±3 |
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μV/V |
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vs Common-Mode Voltage, |
VCM = 1.25V to 3.5V(2) |
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±10 |
±50 |
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±100 |
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μV/V |
RTI (CMRR) |
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Common-Mode Input Range(2) |
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1.25 |
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3.5 |
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V |
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Input Bias Current |
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5 |
25 |
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50 |
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nA |
vs Temperature |
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20 |
±3 |
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±10 |
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pA/°C |
Input Offset Current |
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±0.2 |
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nA |
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vs Temperature |
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5 |
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pA/°C |
Impedance: Differential |
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0.1 || 1 |
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GΩ || pF |
Common-Mode |
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5 || 10 |
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GΩ || pF |
Noise: 0.1Hz to 10Hz |
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0.6 |
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μVp-p |
CURRENT SOURCES |
VO = 2V(6) |
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μA |
Current: XTR112 |
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250 |
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XTR114 |
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100 |
±0.2 |
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±0.4 |
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μA |
Accuracy |
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±0.05 |
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% |
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vs Temperature |
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±15 |
±35 |
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±75 |
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ppm/°C |
vs Power Supply, V+ |
V+ = 7.5V to 36V |
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±10 |
±25 |
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ppm/V |
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Matching |
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±0.02 |
±0.1 |
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±0.2 |
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vs Temperature |
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±3 |
±15 |
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±30 |
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ppm/°C |
vs Power Supply, V+ |
V+ = 7.5V to 36V |
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1 |
10 |
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ppm/V |
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Compliance Voltage, Positive |
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(V+) –3 |
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(V+) –2.5 |
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V |
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Negative(2) |
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0 |
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–0.2 |
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V |
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Output Impedance: XTR112 |
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500 |
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MΩ |
XTR114 |
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1.2 |
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GΩ |
Noise: 0.1Hz to 10Hz: XTR112 |
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0.001 |
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μAp-p |
XTR114 |
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0.0004 |
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μAp-p |
(2) |
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5.1 |
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V |
VREG |
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±0.1 |
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Accuracy |
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±0.02 |
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V |
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vs Temperature |
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±0.2 |
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mV/°C |
vs Supply Voltage, V+ |
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1 |
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mV/V |
Output Current: XTR112 |
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–1, +2.1 |
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mA |
XTR114 |
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–1, +2.4 |
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mA |
Output Impedance |
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75 |
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Ω |
LINEARIZATION |
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kΩ |
RLIN (internal) |
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1 |
±0.5 |
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±1 |
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Accuracy |
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±0.2 |
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vs Temperature |
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±25 |
±100 |
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ppm/°C |
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POWER SUPPLY |
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Specified Voltage |
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+24 |
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V |
Operating Voltage Range |
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+7.5 |
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+36 |
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V |
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TEMPERATURE RANGE |
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°C |
Specification, TMIN to TMAX |
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–40 |
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+85 |
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Operating/Storage Range |
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–55 |
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+125 |
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°C |
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Thermal Resistance, θJA |
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°C/W |
SO-14 Surface-Mount |
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100 |
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Specification same as XTR112U, XTR114U.
NOTES: (1) Describes accuracy of the 4mA low-scale offset current. Does not include input amplifier effects. Can be trimmed to zero. (2) Voltage measured with respect to IRET pin. (3) Does not include initial error or TCR of gain-setting resistor, RG. (4) Increasing the full-scale input range improves nonlinearity. (5) Does not include Zero Output initial error. (6) Current source output voltage with respect to IRET pin.
®
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XTR112, XTR114 |
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PIN CONFIGURATION |
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ABSOLUTE MAXIMUM RATINGS(1) |
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Top View |
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SO-14 |
Power Supply, V+ (referenced to IO pin) .......................................... |
40V |
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Input Voltage, V+ , V |
– |
(referenced to I pin) ............................ |
0V to V+ |
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IN |
IN |
O |
–55°C to +125°C |
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XTR112 and XTR114 |
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Storage Temperature Range ....................................... |
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Lead Temperature (soldering, 10s) .............................................. |
+300°C |
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Output Current Limit |
............................................................... |
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Continuous |
IR1 |
1 |
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14 |
IR2 |
...................................................................Junction Temperature |
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+165°C |
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V – |
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V+ |
NOTE: (1) Stresses above these ratings may cause permanent damage. |
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2 |
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IN |
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IN |
Exposure to absolute maximum conditions for extended periods may degrade |
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RG |
3 |
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12 |
VLIN |
device reliability. |
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RG |
4 |
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VREG |
ELECTROSTATIC |
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NC |
5 |
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10 |
V+ |
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DISCHARGE SENSITIVITY |
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IRET |
6 |
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B (Base) |
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IO |
7 |
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8 |
E (Emitter) |
This integrated circuit can be damaged by ESD. Burr-Brown |
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recommends that |
all integrated circuits |
be handled with |
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NC = No Connection |
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appropriate precautions. Failure to observe proper handling |
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and installation procedures can cause damage. |
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
PACKAGE/ORDERING INFORMATION
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PACKAGE |
SPECIFIED |
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CURRENT |
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DRAWING |
TEMPERATURE |
ORDERING |
TRANSPORT |
PRODUCT |
SOURCES |
PACKAGE |
NUMBER(1) |
RANGE |
NUMBER(2) |
MEDIA |
XTR112U |
2 x 250μA |
SO-14 Surface Mount |
235 |
–40°C to +85°C |
XTR112U |
Rails |
" |
" |
" |
" |
" |
XTR112U/2K5 |
Tape and Reel |
XTR112UA |
2 x 250μA |
SO-14 Surface Mount |
235 |
–40°C to +85°C |
XTR112UA |
Rails |
" |
" |
" |
" |
" |
XTR112UA/2K5 |
Tape and Reel |
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XTR114U |
2 x 100μA |
SO-14 Surface Mount |
235 |
–40°C to +85°C |
XTR114U |
Rails |
" |
" |
" |
" |
" |
XTR114U/2K5 |
Tape and Reel |
XTR114UA |
2 x 100μA |
SO-14 Surface Mount |
235 |
–40°C to +85°C |
XTR114UA |
Rails |
" |
" |
" |
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XTR114UA/2K5 |
Tape and Reel |
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NOTES: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. (2) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500 pieces of “XTR112UA/2K5” will get a single 2500-piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to Appendix B of Burr-Brown IC Data Book.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.
®
3 |
XTR112, XTR114 |
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FUNCTIONAL BLOCK DIAGRAM
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VLIN |
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XTR112: IR1 = IR2 = 250 A |
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I |
R1 |
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XTR114: IR1 = IR2 = 100 A |
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12 |
1 |
IR2 |
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14 |
VREG |
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IR1 |
IR2 |
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V+ |
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11 |
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13 |
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10 |
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V+ |
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5.1V |
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IN |
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4 |
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RLIN |
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B |
Q1 |
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1kΩ |
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100 A |
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9 |
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RG |
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3 |
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E |
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VIN |
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8 |
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2 |
I = 100 A + |
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V |
– |
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RG |
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IN |
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975Ω |
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25Ω |
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7 |
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IO |
= 4mA + VIN |
• ( 40 ) |
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R |
G |
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6 |
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IRET
®
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XTR112, XTR114 |
4 |
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TYPICAL PERFORMANCE CURVES
At TA = +25°C, and V+ = 24V, unless otherwise noted.
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TRANSCONDUCTANCE vs FREQUENCY |
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50 |
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RG = 500Ω |
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mA/V) |
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RG = 125Ω |
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40 |
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20mA |
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Log |
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Transconductance(20 |
30 |
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4mA/div |
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20 |
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RG = 2kΩ |
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10 |
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4mA |
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0 |
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1M |
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100 |
1k |
10k |
100k |
Frequency (Hz)
STEP RESPONSE
RG = 2kΩ
RG = 125Ω
25μs/div
COMMON-MODE REJECTION RATIO vs FREQUENCY |
POWER-SUPPLY REJECTION RATIO vs FREQUENCY |
|
110 |
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100 |
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(dB) |
90 |
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Ratio |
80 |
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Rejection |
70 |
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Mode- |
60 |
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50 |
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Common |
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40 |
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30
20
10
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140 |
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(dB) |
120 |
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RG = 125Ω |
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Ratio |
100 |
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RG = 125Ω |
Rejection |
80 |
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Supply |
60 |
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RG = 2kΩ |
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RG = 2kΩ |
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40 |
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Power |
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20 |
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0 |
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10 |
100 |
1k |
10k |
100k |
1M |
100 |
1k |
10k |
100k |
1M |
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Frequency (Hz) |
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Frequency (Hz) |
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Over-Scale Current (mA)
OVER-SCALE CURRENT vs TEMPERATURE
29
With External Transistor
28
27
V+ = 36V
26
V+ = 7.5V
25
V+ = 24V
24
23
–75 |
–50 |
–25 |
0 |
25 |
50 |
75 |
100 |
125 |
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Temperature (°C) |
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UNDER-SCALE CURRENT vs TEMPERATURE
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1.45 |
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(mA) |
1.4 |
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1.35 |
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XTR112 |
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1.3 |
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Current |
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1.25 |
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Scale- |
1.2 |
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1.15 |
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Under |
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1.05 |
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1.1 |
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1 |
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XTR114 |
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0.95 |
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–75 |
–50 |
–25 |
0 |
25 |
50 |
75 |
100 |
125 |
|||||||||
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Temperature (°C) |
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®
5 |
XTR112, XTR114 |
|
|
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, and V+ = 24V, unless otherwise noted.
INPUT VOLTAGE AND CURRENT
NOISE DENSITY vs FREQUENCY
10k |
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10k |
|
10k |
1k |
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1k |
Noise (pA/ÖHz) |
1k |
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Current Noise |
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100 |
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100 |
100 |
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Hz)(nV/NoiseVoltageÖ |
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Hz)(fA/NoiseCurrentÖ |
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Input |
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Input |
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10 |
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Voltage Noise |
10 |
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10 |
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1 |
10 |
100 |
1k |
10k |
100k |
|
|
ZERO OUTPUT AND REFERENCE
CURRENT NOISE vs FREQUENCY
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Zero Output Current |
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XTR112 |
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Reference Current |
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XTR114 |
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1 |
10 |
100 |
1k |
10k |
100k |
Frequency (Hz) |
Frequency (Hz) |
INPUT BIAS AND OFFSET CURRENT vs TEMPERATURE
|
25 |
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(nA) |
20 |
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Current |
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15 |
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+IB |
||
Offset |
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Bias and |
10 |
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5 |
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–IB |
|
Input |
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IOS |
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0 |
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–75 |
–50 |
–25 |
0 |
25 |
50 |
75 |
100 |
125 |
Temperature (°C)
|
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|
INPUT OFFSET VOLTAGE DRIFT |
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||||||||
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PRODUCTION DISTRIBUTION |
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|||||||
|
80 |
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Typical production distribution |
|
|||||||
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||||||||
|
70 |
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of packaged units. XTR112 and |
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|||||||
|
60 |
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XTR114 included. |
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(%) |
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Units |
50 |
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of |
40 |
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Percent |
30 |
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20 |
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10 |
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0 |
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0 |
0.2 |
0.4 |
0.6 |
0.8 |
1.0 |
1.2 |
1.4 |
1.6 |
1.8 |
2.0 |
2.2 |
2.4 |
2.6 |
2.8 |
3.0 |
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Input Offset Voltage Drift ( V/°C) |
|
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|
ZERO OUTPUT CURRENT ERROR vs TEMPERATURE
|
4 |
|
(µA) |
2 |
|
0 |
||
Error |
||
–2 |
||
Current |
||
–4 |
||
Output |
||
–6 |
||
|
||
Zero |
–8 |
|
–10 |
||
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||
|
–12 |
–75 |
–50 |
–25 |
0 |
25 |
50 |
75 |
100 |
125 |
Temperature (°C)
|
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|
ZERO OUTPUT DRIFT |
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PRODUCTION DISTRIBUTION |
|
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||||||||||
|
40 |
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Typical production distribution |
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||||||||||
|
35 |
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of packaged units. XTR112 |
|
|||||||||
|
30 |
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and XTR114 included. |
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(%) |
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Units |
25 |
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of |
20 |
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Percent |
15 |
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10 |
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5 |
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0 |
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0 |
0.025 |
0.05 |
0.075 |
0.1 |
0.125 |
0.15 |
0.175 |
0.2 |
0.225 |
0.25 |
0.275 |
0.3 |
0.325 |
0.35 |
0.375 |
0.4 |
0.425 |
0.45 |
0.475 |
0.5 |
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|
Zero Output Drift ( A/°C) |
|
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|
®
|
XTR112, XTR114 |
6 |
|