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LTC1655 Datasheet(PDF) 11 Page - Linear Technology

Part # LTC1655
Description  16-Bit Rail-to-Rail Micropower DACs in SO-8 Package
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1655 Datasheet(HTML) 11 Page - Linear Technology

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11
LTC1655/LTC1655L
TYPICAL APPLICATIONS
This circuit shows how to use an LTC1655 to make an
optoisolated digitally controlled 4mA to 20mA process
controller. The controller circuitry, including the
optoisolation, is powered by the loop voltage that can have
a wide range of 6V to 30V. The 2.048V reference output of
the LTC1655 is used for the 4mA offset current and VOUT
is used for the digitally controlled 0mA to 16mA current.
RS is a sense resistor and the op amp modulates the
transistor Q1 to provide the 4mA to 20mA current through
this resistor. The potentiometers allow for offset and full-
scale adjustment. The control circuitry dissipates well
under the 4mA budget at zero scale.
1655/55L TA03
3k
10k
1k
75k
1%
5k
150k
1%
20k
Q1
2N3440
RS
10
VLOOP
6V TO 30V
IOUT
OUT
IN
CLK
DIN
CS/LD
CLK
DIN
CS/LD
CLK
DIN
CS/LD
VCC
VOUT
1
µF
LTC1655
4N28
OPTOISOLATORS
5V
500
LT
®1121-5
FROM
OPTOISOLATED
INPUTS
VREF
GND
+
LT
®1077
1
86
5
7
2
3
6
7
4
3
2
An Isolated 4mA to 20mA Process Controller


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