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PDF XTR115UA Data sheet ( Hoja de datos )

Número de pieza XTR115UA
Descripción 4-20mA CURRENT LOOP TRANSMITTERS
Fabricantes Burr-Brown Corporation 
Logotipo Burr-Brown Corporation Logotipo



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No Preview Available ! XTR115UA Hoja de datos, Descripción, Manual

®
XTR116
XTR115
XTR115
XTR116
For most current data sheet and other product
information, visit www.burr-brown.com
4-20mA CURRENT LOOP TRANSMITTERS
FEATURES
q LOW QUIESCENT CURRENT: 200µA
q 5V REGULATOR FOR EXTERNAL CIRCUITS
q VREF FOR SENSOR EXCITATION:
XTR115: 2.5V
XTR116: 4.096V
q LOW SPAN ERROR: 0.05%
q LOW NONLINEARITY ERROR: 0.003%
q WIDE LOOP SUPPLY RANGE: 7.5V to 36V
q SO-8 PACKAGE
DESCRIPTION
The XTR115 and XTR116 are precision current out-
put converters designed to transmit analog 4-to-20mA
signals over an industry standard current loop. They
provide accurate current scaling and output current
limit functions.
The on-chip voltage regulator (5V) can be used to
power external circuitry. A precision on-chip VREF
(2.5V for XTR115 and 4.096V for XTR116) can be
APPLICATIONS
q 2-WIRE, 4-20mA CURRENT LOOP
TRANSMITTER
q SMART TRANSMITTER
q INDUSTRIAL PROCESS CONTROL
q TEST SYSTEMS
q COMPATIBLE WITH HART MODEM
q CURRENT AMPLIFIER
q VOLTAGE-TO-CURRENT AMPLIFIER
used for offsetting or to excite transducers. A current
return pin (IRET) senses any current used in external
circuitry to assure an accurate control of the output
current.
The XTR115 is a fundamental building block of
smart sensors using 4-to-20mA current transmission.
The XTR115 and XTR116 are specified for opera-
tion over the extended industrial temperature range,
–40°C to +85°C.
+5V
XTR115: 2.5V
XTR116: 4.096V
VREG
8
VREF
1
XTR115
XTR116
+5V
Regulator
Voltage
Reference
V+
7
RIN IIN
2
+
A1
VIN
3
IRET
R1
2.475k
B
6
RLIM
R2
25
E
5
IO =
100 VIN
RIN
4
I = 100 • IIN
VLOOP
RL
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
©2000 Burr-Brown Corporation
PDS-11582A
XTR115,PriXnteTd Rin U1.S1.A6. January, 2000
®

1 page




XTR115UA pdf
APPLICATIONS INFORMATION
The XTR115 and XTR116 are identical devices except for
the reference voltage output, pin 1. This voltage is available
for external circuitry and is not used internally. Further
discussions that apply to both devices will refer to the
“XTR115/6.”
Figure 1 shows basic circuit connections with representative
simplified input circuitry. The XTR115/6 is a two-wire
current transmitter. Its input signal (pin 2) controls the output
current. A portion of this current flows into the V+ power
supply, pin 7. The remaining current flows in Q1. External
input circuitry connected to the XTR115/6 can be powered
from VREG or VREF. Current drawn from these terminals
must be returned to IRET, pin 3. This IRET pin is a “local
ground” for input circuitry driving the XTR115/6.
The XTR115/6 is a current-input device with a gain of 100.
A current flowing into pin 2 produces IO = 100 • IIN. The
input voltage at the IIN pin is zero (referred to the IRET pin).
A voltage input is created with an external input resistor, as
shown. Common full-scale input voltages range from 1V
and upward. Full-scale inputs greater than 0.5V are recom-
mend to minimize the effect of offset voltage and drift of A1.
EXTERNAL TRANSISTOR
The external transistor, Q1, conducts the majority of the full-
scale output current. Power dissipation in this transistor can
approach 0.8W with high loop voltage (40V) and 20mA
output current. The XTR115/6 is designed to use an external
transistor to avoid on-chip thermal-induced errors. Heat
produced by Q1 will still cause ambient temperature changes
that can affect the XTR115/6. To minimize these effects,
locate Q1 away from sensitive analog circuitry, including
XTR115/6. Mount Q1 so that heat is conducted to the
outside of the transducer housing.
The XTR115/6 is designed to use virtually any NPN transis-
tor with sufficient voltage, current and power rating. Case
style and thermal mounting considerations often influence
the choice for any given application. Several possible choices
are listed in Figure 1. A MOSFET transistor will not improve
the accuracy of the XTR115/6 and is not recommended.
XTR115: 2.5V
XTR116: 4.096V
IREG
5V VREG
8
XTR115
XTR116
+5V
Regulator
IREF
VREF
Voltage
1 Reference
V+
7
IO
RIN
Input
VIN 20k
Circuitry
IIN
IIN
2
A1
All return current
from IREG and IREF
3
IRET
For IO = 4mA to 20mA
IIN = 40µA to 200µA
With RIN = 20k
VIN = 0.8V to 4V
R1
2.475k
B
6 Q1 10nF
RLIM
R2
25
E
5
IO
4
I = 100 • IIN
VLOOP
RL
Possible choices for Q1 (see text).
TYPE
PACKAGE
2N4922
TIP29C
TIP31B
TO-225
TO-220
TO-220
FIGURE 1. Basic Circuit Connections.
®
5 XTR115, XTR116

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