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PDF XTR114 Data sheet ( Hoja de datos )
| Número de pieza | XTR114 | |
| Descripción | 4-20mA CURRENT TRANSMITTERS with Sensor Excitation and Linearization | |
| Fabricantes | Burr-Brown Corporation | |
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®
XTR114
XTR112
XTR112
XTR114
4-20mA CURRENT TRANSMITTERS
with Sensor Excitation and Linearization
FEATURES
q LOW UNADJUSTED ERROR
q PRECISION CURRENT SOURCES
XTR112: Two 250µA
XTR114: Two 100µA
q RTD OR BRIDGE EXCITATION
q LINEARIZATION
q TWO OR THREE-WIRE RTD OPERATION
q LOW OFFSET DRIFT: 0.4µV/°C
q LOW OUTPUT CURRENT NOISE: 30nAp-p
q HIGH PSR: 110dB min
q HIGH CMR: 86dB min
q WIDE SUPPLY RANGE: 7.5V TO 36V
q SO-14 SOIC PACKAGE
APPLICATIONS
q INDUSTRIAL PROCESS CONTROL
q FACTORY AUTOMATION
q SCADA REMOTE DATA ACQUISITION
q REMOTE TEMPERATURE AND PRESSURE
TRANSDUCERS
Pt1000 NONLINEARITY CORRECTION
USING XTR112 and XTR114
5
4
3
Uncorrected
RTD Nonlinearity
2
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 am-
plifier, 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 trans-
mitter is low enough to permit use without adjustment
in many applications. This includes zero output cur-
rent 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 pack-
age and are specified for the –40°C to +85°C indus-
trial temperature range.
1
0
–1
–200°C
Corrected
Nonlinearity
Process Temperature (°C)
+850°C
RTD
IR
IR VLIN
VREG
+
XTR112
RG XTR114
–
7.5V to 36V
VPS
4-20 mA
VO
RL
XTR112: IR = 250µA
XTR114: IR = 100µA
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 • Immediate Product Info: (800) 548-6132
©1998 Burr-Brown Corporation
PDS-11473A
XTR112Pr,intXedTinRU.1S.A1. 4December, 1998
®
1 page  
TYPICAL PERFORMANCE CURVES
At TA = +25°C, and V+ = 24V, unless otherwise noted.
TRANSCONDUCTANCE vs FREQUENCY
50
RG = 500Ω
RG = 125Ω
40
30
20
RG = 2kΩ
10
0
100
1k 10k 100k
Frequency (Hz)
1M
20mA
STEP RESPONSE
RG = 2kΩ
RG = 125Ω
4mA
25µs/div
COMMON-MODE REJECTION RATIO vs FREQUENCY
110
100
90
80 RG = 125Ω
70
60
50 RG = 2kΩ
40
30
20
10
100
1k
10k 100k
1M
Frequency (Hz)
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
Temperature (°C)
75 100 125
POWER-SUPPLY REJECTION RATIO vs FREQUENCY
140
120
RG = 125Ω
100
80
60 RG = 2kΩ
40
20
0
10
100
1k
10k 100k
1M
Frequency (Hz)
1.45
1.4
1.35
1.3
1.25
1.2
1.15
1.1
1.05
1
0.95
–75
UNDER-SCALE CURRENT vs TEMPERATURE
XTR112
XTR114
–50 –25 0 25 50
Temperature (°C)
75 100
125
®
5 XTR112, XTR114
5 Page 
TMIN
–200°C
–100°C
0°C
100°C
200°C
300°C
400°C
500°C
600°C
700°C
800°C
XTR112 1% RESISTOR VALUES FOR A THREE-WIRE RTD CONNECTION
MEASUREMENT TEMPERATURE SPAN ∆T (°C)
100°C
187/267
48700
61900
604/255
86600
110000
1000/243
105000
130000
1370/237
102000
127000
1740/232
100000
121000
2100/221
95300
118000
2490/215
93100
113000
2800/210
887000
107000
3160/200
86600
102000
3480/191
82500
100000
3740/187
80600
95300
200°C
187/536
31600
48700
604/499
49900
75000
1000/487
51100
76800
1370/475
49900
73200
1740/464
48700
69800
2100/442
46400
68100
2490/432
45300
64900
2800/412
43200
61900
3160/402
42200
59000
300°C
187/806
25500
46400
604/4750
33200
59000
1000/732
33200
57600
1370/715
32400
56200
1740/698
31600
53600
2100/665
30100
51100
2490/649
29400
48700
2800/619
28000
45300
400°C 500°C 600°C 700°C 800°C 900°C 1000°C
187/1050 187/1330 187/1580 187/1820 187/2100 187/2370 187/2670
21500 17800 15000 13000 11300
9760
8660
44200 41200 39200 36500 34800 33200 31600
604/1000 604/1270 604/1500 604/1780 604/2050 604/2260
24900 19600 15800 13300 11500 10000
49900 44200 40200 37400 34800 32400
1000/976 1000/1210 1000/1470 1000/1740 1000/1960
24300 19100 15400 13000 11000
48700 42200 38300 35700 33200
1370/953 1370/1180 1370/1430 1370/1690
23700 18700 15000 12400
46400 40200 36500 33200
1740/931 1740/1150 1740/1400
23200 17800 14300
44200 38300 34800
RZ /RG
RLIN1
RLIN2
2100/887 2100/1130
22100 17400
42200 36500
2490/866
21500
40200
NOTE: The values listed in the table are 1% resistors (in Ω).
Exact values may be calculated from the following equations:
RZ = RTD resistance at minimum measured temperature, TMIN.
RG
=
0.625
•
(R2 – RZ ) (R1 – RZ )
(R2 – R1)
RLIN1
=
1.6 • RLIN(R2 – R1)
(2R1 – R2 – RZ )
RLIN2
=
1.6
•
(RLIN + RG) (R2 – R1)
(2R1 – R2 – RZ )
where R1 = RTD resistance at the midpoint measured temperature, (TMIN + TMAX)/2
R2 = RTD resistance at TMAX
RLIN = 1kΩ (Internal)
TABLE II. XTR112 RZ, RG, RLIN1, and RLIN2 Standard 1% Resistor Values for Three-Wire Pt1000 RTD Connection with Linearization.
TMIN
–200°C
–100°C
0°C
100°C
200°C
300°C
400°C
500°C
600°C
700°C
800°C
XTR114 1% RESISTOR VALUES FOR A THREE-WIRE RTD CONNECTION
MEASUREMENT TEMPERATURE SPAN ∆T (°C)
100°C
187/107
121000
133000
604/102
221000
243000
1000/97.6
261000
287000
1370/95.3
255000
280000
1740/90.9
249000
267000
2100/88.9
237000
261000
2490/86.6
232000
249000
2800/82.5
221000
243000
3160/80.6
215000
215000
3480/76.8
205000
221000
3740/75
200000
215000
200°C
187/215
78700
95300
604/200
124000
150000
1000/196
130000
154000
1370/191
124000
147000
1740/182
121000
143000
2100/178
118000
137000
2490/174
113000
133000
2800/165
110000
127000
3160/162
105000
121000
300°C
187/316
64900
84500
604/301
84500
110000
1000/294
84500
107000
1370/287
80600
105000
1740/274
78700
100000
2100/267
75000
95300
2490/261
73200
93100
2800/49
69800
88700
400°C
187/422
53600
76800
604/402
61900
86600
1000/392
61900
84500
1370/383
59000
82500
1740/365
57600
78700
2100/357
54900
75000
2490/249
53600
71500
500°C
187/523
45300
68100
604/511
48700
73200
1000/487
47500
71500
1370/475
46400
68100
1740/464
44200
64900
2100/348
43200
61900
600°C
187/634
38300
68100
604/604
40200
63400
1000/590
39200
61900
1370/576
37400
59000
1740/549
36500
56200
700°C
187/732
32400
56200
604/715
33200
57600
1000/681
32400
54900
1370/665
31600
52300
800°C
187/845
28000
52300
604/806
28700
52300
1000/787
27400
49900
900°C
187/953
24900
47500
604/909
24900
47500
RZ /RG
RLIN1
RLIN2
1000°C
187/1050
21500
45300
NOTE: The values listed in the table are 1% resistors (in Ω).
Exact values may be calculated from the following equations:
RZ = RTD resistance at minimum measured temperature, TMIN.
RG
=
0.25 • (R2 – RZ ) (R1 – RZ )
(R2 – R1)
RLIN1 =
4 • RLIN(R2 – R1)
(2R1 – R2 – RZ )
RLIN2
=
4
• (RLIN + RG) (R2 – R1)
(2R1 – R2 – RZ )
where R1 = RTD resistance at the midpoint measured temperature, (TMIN + TMAX)/2
R2 = RTD resistance at TMAX
RLIN = 1kΩ (Internal)
TABLE III. XTR114 RZ, RG, RLIN1, and RLIN2 Standard 1% Resistor Values for Three-Wire Pt1000 RTD Connection with Linearization.
®
11 XTR112, XTR114
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet XTR114.PDF ] | |
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