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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
1998 Burr-Brown Corporation
PDS-1449A
Printed in U.S.A. June, 1998
XTR106
4-20mA CURRENT TRANSMITTER
with Bridge Excitation and Linearization
FEATURES
q
LOW TOTAL UNADJUSTED ERROR
q
2.5V, 5V BRIDGE EXCITATION REFERENCE
q
5.1V REGULATOR OUTPUT
q
LOW SPAN DRIFT:
25ppm/
C max
q
LOW OFFSET DRIFT: 0.25
V/
C
q
HIGH PSR: 110dB min
q
HIGH CMR: 86dB min
q
WIDE SUPPLY RANGE: 7.5V to 36V
q
14-PIN DIP AND SO-14 SURFACE-MOUNT
APPLICATIONS
q
PRESSURE BRIDGE TRANSMITTER
q
STRAIN GAGE TRANSMITTER
q
TEMPERATURE BRIDGE TRANSMITTER
q
INDUSTRIAL PROCESS CONTROL
q
SCADA REMOTE DATA ACQUISITION
q
REMOTE TRANSDUCERS
q
WEIGHING SYSTEMS
q
ACCELEROMETERS
DESCRIPTION
The XTR106 is a low cost, monolithic 4-20mA, two-
wire current transmitter designed for bridge sensors. It
provides complete bridge excitation (2.5V or 5V refer-
ence), instrumentation amplifier, sensor linearization,
and current output circuitry. Current for powering ad-
ditional external input circuitry is available from the
V
REG
pin.
The instrumentation amplifier can be used over a wide
range of gain, accommodating a variety of input signal
types and sensors. Total unadjusted error of the com-
plete current transmitter, including the linearized bridge,
is low enough to permit use without adjustment in many
applications. The XTR106 operates on loop power sup-
ply voltages down to 7.5V.
Linearization circuitry provides second-order correction
to the transfer function by controlling bridge excitation
voltage. It provides up to a 20:1 improvement in
nonlinearity, even with low cost transducers.
The XTR106 is available in 14-pin plastic DIP and
SO-14 surface-mount packages and is specified for the
40
C to +85
C temperature range. Operation is from
55
C to +125
C.
XTR106
XTR106
XTR106
R
L
I
OUT
I
RET
V
O
4-20mA
V
PS
+
7.5V to 36V
V
REF
2.5V
V
REF
5
5V
R
LIN
Lin
Polarity
V
REG
(5.1V)
R
G
BRIDGE NONLINEARITY CORRECTION
USING XTR106
0mV
Bridge Output
10mV
2.0
1.5
1.0
0.5
0
0.5
Uncorrected
Bridge Output
Corrected
5mV
Nonlinearity (%)
2
XTR106
I
O
= V
IN
(40/R
G
) + 4mA, V
IN
in Volts, R
G
in
SPECIFICATIONS
At T
A
= +25
C, V+
= 24V, and TIP29C external transistor, unless otherwise noted.
XTR106P, U
XTR106PA, UA
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
OUTPUT
Output Current Equation
I
O
A
Output Current, Specified Range
4
20
T
T
mA
Over-Scale Limit
I
OVER
24
28
30
T
T
T
mA
Under-Scale Limit
I
UNDER
I
REG
= 0, I
REF
= 0
1
1.6
2.2
T
T
T
mA
I
REF
+ I
REG
= 2.5mA
2.9
3.4
4
T
T
T
mA
ZERO OUTPUT
(1)
I
ZERO
V
IN
= 0V, R
G
=
4
T
mA
Initial Error
5
25
T
50
A
vs Temperature
T
A
= 40
C to +85
C
0.07
0.9
T
T
A/
C
vs Supply Voltage, V+
V+ = 7.5V to 36V
0.04
0.2
T
T
A/V
vs Common-Mode Voltage (CMRR)
V
CM
= 1.1V to 3.5V
(5)
0.02
T
A/V
vs V
REG
(I
O
)
0.8
T
A/mA
Noise: 0.1Hz to 10Hz
i
n
0.035
T
Ap-p
SPAN
Span Equation (Transconductance)
S
S = 40/R
G
T
A/V
Untrimmed Error
Full Scale (V
IN
) = 50mV
0.05
0.2
T
0.4
%
vs Temperature
(2)
T
A
= 40
C to +85
C
3
25
T
T
ppm/
C
Nonlinearity: Ideal Input
(3)
Full Scale (V
IN
) = 50mV
0.001
0.01
T
T
%
INPUT
(4)
Offset Voltage
V
OS
V
CM
= 2.5V
50
100
T
250
V
vs Temperature
T
A
= 40
C to +85
C
0.25
1.5
T
3
V/
C
vs Supply Voltage, V+
V+ = 7.5V to 36V
0.1
3
T
T
V/V
vs Common-Mode Voltage, RTI
CMRR
V
CM
= 1.1V to 3.5V
(5)
10
50
T
100
V/V
Common-Mode Range
(5)
V
CM
1.1
3.5
T
T
V
Input Bias Current
I
B
5
25
T
50
nA
vs Temperature
T
A
= 40
C to +85
C
20
T
pA/
C
Input Offset Current
I
OS
0.2
3
T
10
nA
vs Temperature
T
A
= 40
C to +85
C
5
T
pA/
C
Impedance: Differential
Z
IN
0.1 || 1
T
G
|| pF
Common-Mode
5 || 10
T
G
|| pF
Noise: 0.1Hz to 10Hz
V
n
0.6
T
Vp-p
VOLTAGE REFERENCES
(5)
Lin Polarity Connected
to V
REG
, R
LIN
= 0
Initial: 2.5V Reference
V
REF
2.5
2.5
T
V
5V Reference
V
REF
5
5
T
V
Accuracy
V
REF
= 2.5V or 5V
0.05
0.25
T
0.5
%
vs Temperature
T
A
= 40
C to +85
C
20
35
T
75
ppm/
C
vs Supply Voltage, V+
V+ = 7.5V to 36V
5
20
T
T
ppm/V
vs Load
I
REF
= 0mA to 2.5mA
60
T
ppm/mA
Noise: 0.1Hz to 10Hz
10
T
Vp-p
V
REG
(5)
V
REG
5.1
T
V
Accuracy
0.02
0.1
T
T
V
vs Temperature
T
A
= 40
C to +85
C
0.3
T
mV/
C
vs Supply Voltage, V+
V+ = 7.5V to 36V
1
T
mV/V
Output Current
I
REG
See Typical Curves
T
mA
Output Impedance
I
REG
= 0mA to 2.5mA
80
T
LINEARIZATION
(6)
R
LIN
(external) Equation
R
LIN
K
LIN
Linearization Factor
K
LIN
V
REF
= 5V
6.645
T
k
V
REF
= 2.5V
9.905
T
k
Accuracy
1
5
T
T
%
vs Temperature
T
A
= 40
C to +85
C
50
100
T
T
ppm/
C
Max Correctable Sensor Nonlinearity
B
V
REF
= 5V
5
T
% of V
FS
V
REF
= 2.5V
2.5, +5
T
% of V
FS
POWER SUPPLY
V+
Specified
+24
T
V
Voltage Range
+7.5
+36
T
T
V
TEMPERATURE RANGE
Specification
40
+85
T
T
C
Operating
55
+125
T
T
C
Storage
55
+125
T
T
C
Thermal Resistance
JA
14-Pin DIP
80
T
C/W
SO-14 Surface Mount
100
T
C/W
T
Specification same as XTR106P, XTR106U.
NOTES: (1) Describes accuracy of the 4mA low-scale offset current. Does not include input amplifier effects. Can be trimmed to zero. (2) Does not include initial
error or TCR of gain-setting resistor, R
G
. (3) Increasing the full-scale input range improves nonlinearity. (4) Does not include Zero Output initial error. (5) Voltage
measured with respect to I
RET
pin. (6) See "Linearization" text for detailed explanation. V
FS
= full-scale V
IN
.
R
LIN
= K
LIN
, K
LIN
in
, B is nonlinearity relative to V
FS
4B
1 2B
3
XTR106
V
REG
V
IN
R
G
R
G
V
IN
I
RET
I
O
V
REF
5
V
REF
2.5
Lin Polarity
R
LIN
V+
B (Base)
E (Emitter)
1
2
3
4
5
6
7
14
13
12
11
10
9
8
+
Power Supply, V+ (referenced to I
O
pin) .......................................... 40V
Input Voltage, V
IN
, V
IN
(referenced to I
RET
pin) ......................... 0V to V+
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.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability.
ABSOLUTE MAXIMUM RATINGS
(1)
Top View
DIP and SOIC
PIN CONFIGURATION
+
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.
PACKAGE/ORDERING INFORMATION
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.
PACKAGE
SPECIFIED
DRAWING
TEMPERATURE
PACKAGE
ORDERING
TRANSPORT
PRODUCT
PACKAGE
NUMBER
(1)
RANGE
MARKING
NUMBER
(2)
MEDIA
XTR106P
14-Pin DIP
010
40
C to +85
C
XTR106P
XTR106P
Rails
XTR106PA
14-Pin DIP
010
40
C to +85
C
XTR106PA
XTR106PA
Rails
XTR106U
SO-14 Surface Mount
235
40
C to +85
C
XTR106U
XTR106U
Rails
"
"
"
"
"
XTR106U/2K5
Tape and Reel
XTR106UA
SO-14 Surface Mount
235
40
C to +85
C
XTR106UA
XTR106UA
Rails
"
"
"
"
"
XTR106UA/2K5
Tape and Reel
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 "XTR106U/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.
4
XTR106
FUNCTIONAL DIAGRAM
REF
Amp
Lin
Amp
Current
Direction
Switch
Bandgap
V
REF
V
REF
5
V
REF
2.5
V
IN
R
G
14
13
I
RET
+
V
IN
5.1V
11
1
10
25
975
I = 100A +
V
IN
R
G
5
4
3
2
100A
R
LIN
V
REG
Lin
Polarity
V+
12
B
9
E
8
6
7
I
O
= 4mA + V
IN
( )
40
R
G
5
XTR106
TYPICAL PERFORMANCE CURVES
At T
A
= +25
C, V+ = 24V, unless otherwise noted.
1.0
0.5
0
0.5
1.0
1.5
2.0
2.5
Current (mA)
INPUT OFFSET VOLTAGE CHANGE
vs V
REG
and V
REF
CURRENTS
1.5
1.0
0.5
0
0.5
1.0
1.5
2.0
2.5
V
OS
(
V)
V
OS
vs I
REG
V
OS
vs I
REF
20mA
STEP RESPONSE
50
s/div
4
m
A/
div
4mA
R
G
= 1k
C
OUT
= 0.01
F
R
G
= 50
100
1k
10k
100k
1M
Frequency (Hz)
TRANSCONDUCTANCE vs FREQUENCY
60
50
40
30
20
10
0
Transconductance (20 log mA/V)
C
OUT
= 0.01F
R
G
= 1k
R
L
= 250
R
G
= 50
C
OUT
= 0.01F
C
OUT
= 0.033F
C
OUT
connected
between V+ and I
O
10
1k
100
10k
100k
1M
Frequency (Hz)
COMMON-MODE REJECTION vs FREQUENCY
110
100
90
80
70
60
50
40
30
Common-Mode Rejection (dB)
R
G
= 1k
R
G
= 50
10
1k
100
10k
100k
1M
Frequency (Hz)
POWER SUPPLY REJECTION vs FREQUENCY
160
140
120
100
80
60
40
20
0
Power Supply Rejection (dB)
R
G
= 1k
C
OUT
= 0
R
G
= 50
INPUT OFFSET VOLTAGE DRIFT
PRODUCTION DISTRIBUTION
Percent of Units (%)
Offset Voltage Drift (V/C)
90
80
70
60
50
40
30
20
10
0
Typical production
distribution of
packaged units.
0
0.25
0.5
0.75
1.0
1.25
1.5
1.75
2.0
2.25
2.5
2.75
3.0
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