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XTR110 Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer XTR110
Beschreibung PRECISION VOLTAGE-TO-CURRENT CONVERTER/TRANSMITTER
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 9 Seiten
XTR110 Datasheet, Funktion
® XTR110
PRECISION VOLTAGE-TO-CURRENT
CONVERTER/TRANSMITTER
FEATURES
q 4mA TO 20mA TRANSMITTER
q SELECTABLE INPUT/OUTPUT RANGES:
0V to +5V, 0V to +10V Inputs
0mA to 20mA, 5mA to 25mA Outputs
Other Ranges
q 0.005% MAX NONLINEARITY, 14 BIT
q PRECISION +10V REFERENCE OUTPUT
q SINGLE SUPPLY OPERATION
q WIDE SUPPLY RANGE: 13.5V to 40V
APPLICATIONS
q INDUSTRIAL PROCESS CONTROL
q PRESSURE/TEMPERATURE
TRANSMITTERS
q CURRENT-MODE BRIDGE EXCITATION
q GROUNDED TRANSDUCER CIRCUITS
q CURRENT SOURCE REFERENCE FOR
DATA ACQUISITION
q PROGRAMMABLE CURRENT SOURCE
FOR TEST EQUIPMENT
q POWER PLANT/ENERGY SYSTEM
MONITORING
DESCRIPTION
The XTR110 is a precision voltage-to-current con-
verter designed for analog signal transmission. It ac-
cepts inputs of 0 to 5V or 0 to 10V and can be
connected for outputs of 4 to 20mA, 0 to 20mA, 5 to
25mA and many other commonly used ranges.
A precision on-chip metal film resistor network pro-
vides input scaling and current offsetting. An internal
10V voltage reference can be used to drive external
circuitry.
The XTR110 is available in 16-pin plastic DIP, ce-
ramic DIP and SOL-16 surface-mount packages. Com-
mercial and industrial temperature range models are
available.
VREF Force 15
VREF Sense 12
VREF Adjust 11
VIN1 (10V) 4
VREF In 3
VIN2 (5V) 5
Common 2
+10V
Reference
R1
R5
R2
R3
R4
A1
R9
R8
A2
16 +VCC
1 Source
Resistor
13 Source
Sense
14
Gate
Drive
7 Offset
(zero)
6 Adjust
8
Span
Adjust
R7
10 4mA
Span
R6
9 16mA
Span
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 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1984 Burr-Brown Corporation
PDS-555D
Printed in U.S.A. September, 1993






XTR110 Datasheet, Funktion
If the supply voltage, +VCC, exceeds the gate-to-source
breakdown voltage of QEXT, and the output connection
(drain of QEXT) is broken, QEXT could fail. If the gate-to-
source breakdown voltage is lower than +VCC, QEXT can be
protected with a 12V zener diode connected from gate to
source.
Two PNP discrete transistors (Darlington-connected) can be
used for QEXT—see Figure 2. Note that an additional capaci-
tor is required for stability. Integrated Darlington transistors
are not recommended because their internal base-emitter
resistors cause excessive error.
16
1
XTR110
13
14
2
47nF
0.047µF
+VCC
TIP30B
etc.
2N2907
etc.
IOUT
RL
TRANSISTOR DISSIPATION
Maximum power dissipation of QEXT depends on the power
supply voltage and full-scale output current. Assuming that
the load resistance is low, the power dissipated by QEXT is:
PMAX = (+VCC) IFS
(2)
The transistor type and heat sinking must be chosen accord-
ing to the maximum power dissipation to prevent overheat-
ing. See Table II for general recommendations.
PACKAGE TYPE
TO-92
TO-237
TO-39
TO-220
TO-3
ALLOWABLE POWER DISSIPATION
Lowest: Use minimum supply and at +25°C.
Acceptable: Trade-off supply and temperature.
Good: Adequate for majority of designs.
Excellent: For prolonged maximum stress.
Use if hermetic package is required.
TABLE II. External Transistor Package Type and
Dissipation.
INPUT VOLTAGE RANGE
The internal op amp A1 can be damaged if its non-inverting
input (an internal node) is pulled more than 0.5V below
common (0V). This could occur if input pins 3, 4 or 5 were
driven with an op amp whose output could swing negative
under abnormal conditions. The voltage at the input of A1 is:
(VREF IN)
(VIN1)
(VIN2)
VA1 =
++
16 4 2
(3)
This voltage should not be allowed to go more negative than
–0.5V. If necessary, a clamp diode can be connected from
the negative-going input to common to clamp the input
voltage.
COMMON (Ground)
Careful attention should be directed toward proper con-
nection of the common (grounds). All commons should
be joined at one point as close to pin 2 of the XTR110 as
possible. The exception is the IOUT return. It can be
returned to any point where it will not modulate the
common at pin 2.
Common
FIGURE 2. QEXT Using PNP Transistors.
VREF
VREF Force
15
VREF Sense
VREF Adjust
12
11
R
20k
RS(1)
Adjust Range
±5% Optimum
+VCC
16
XTR110
2 Common
NOTE: (1) RS gives higher resolution with reduced
range, set RS = 0for larger range.
FIGURE 3. Optional Adjustment of Reference Voltage.
QREF
+10VREF
Force
Sense
15
12
16
XTR110
2
+VCC
For 100mA with VCC up to
40V use 2N3055 for QREF.
FIGURE 4. Increasing Reference Current Drive.
3 should be connected to this point. The circuit in Figure 3
shows adjustment of the voltage reference.
The current drive capability of the XTR110’s internal refer-
ence is 10mA. This can be extended if desired by adding an
external NPN transistor shown in Figure 4.
VOLTAGE REFERENCE
The reference voltage is accurately regulated at pin 12
(VREF SENSE). To preserve accuracy, any load including pin
OFFSET (ZERO) ADJUSTMENT
The offset current can be adjusted by using the potentiom-
eter, R1, shown in Figure 5. Set the input voltage to zero and
then adjust R1 to give 4mA at the output. For spans starting
®
XTR110
6

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