current transmitter with two precision current sources.
It provides complete current excitation for Platinum
RTD temperature sensors and bridges, instrumenta-
tion amplifier, and current output circuitry on a single
integrated circuit.
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 XTR105
operates on loop power supply voltages down to 7.5V.
The XTR105 is available in 14-pin plastic DIP and
SO-14 surface-mount packages and is specified for the
–40°C to +85°C industrial temperature range.
Corrected
Nonlinearity
I
R
= 0.8mA
I
R
= 0.8mA
V
LIN
V
REG
+
7.5V to 36V
V
PS
4-20 mA
R
G
RTD
–
XTR105
V
O
R
L
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
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 I
RET
pin. (3) Does not include initial error or TCR of gain-setting resistor, R
G
. (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 I
Storage Temperature Range ........................................ –55°C to +125°C
Lead Temperature (soldering, 10s) .............................................. +300°C
Output Current Limit ............................................................... Continuous
Junction Temperature ................................................................... +165°C
NOTE: (1) Stresses above these ratings may cause permanent damage.
1
2
3
4
5
6
7
14 I
R2
13 V
IN
12 V
LIN
11 V
REG
10 V+
9
8
B (Base)
E (Emitter)
+
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
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.
NC = No Internal Connection.
PACKAGE/ORDERING INFORMATION
PACKAGE
DRAWING
NUMBER
(1)
010
010
235
235
TEMPERATURE
RANGE
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
PRODUCT
XTR105PA
XTR105P
XTR105UA
XTR105U
PACKAGE
14-Pin Plastic DIP
14-Pin Plastic DIP
SO-14 Surface Mount
SO-14 Surface Mount
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.
FUNCTIONAL BLOCK DIAGRAM
V
LIN
I
R1
12
1
I
R2
14
800µA
800µA
V
REG
V+
11
10
+
V
IN
13
4
R
LIN
1kΩ
R
G
3
2
I = 100µA +
V
IN
R
G
5.1V
B
100µA
9
Q
1
E
8
–
V
IN
975Ω
25Ω
7
40
(
R
)
G
I
O
= 4mA + V
IN
•
6
I
RET
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
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