參數(shù)資料
型號: LTC1658CN8
廠商: LINEAR TECHNOLOGY CORP
元件分類: DAC
英文描述: 14-Bit Rail-to-Rail Micropower DAC in MSOP
中文描述: SERIAL INPUT LOADING, 12 us SETTLING TIME, 14-BIT DAC, PDIP8
封裝: 0.300 INCH, PLASTIC, DIP-8
文件頁數(shù): 9/12頁
文件大?。?/td> 261K
代理商: LTC1658CN8
9
LTC1658
An Optoisolated 4mA to 20mA Process Controller
CLK
D
IN
CS/LD
1
μ
F
IN
OUT
Q1
2N3440
R
S
10
I
OUT
V
3.8V TO 30V
V
CC
REF
V
OUT
FROM
OPTO-
ISOLATED
INPUTS
LTC1658
1658 TA04
LT
1121-3.3
3.01k
1%
+
+
LT1077
1k
20k
237k
1%
5k
60.4k
1%
OPTOISOLATORS
500
3.3V
3.6k
4N28
CLK
D
IN
CS/LD
CLK
D
IN
CS/LD
This circuit shows how to use an LTC1658 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 3.8V to 30V. The 3.3V output of the
LT1121-3.3 is used for the 4mA offset current and V
OUT
is
used for the digitally controlled 0mA to 16mA current. R
S
is a sense resistor and the op amp modulates the transis-
tor 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.
TYPICAL APPLICATIO S
相關PDF資料
PDF描述
LTC1658CS8 Low-Power Dual LinCMOS<TM> Timer 20-LCCC -55 to 125
LTC1658IMS8 14-Bit Rail-to-Rail Micropower DAC in MSOP
LTC1658IN8 14-Bit Rail-to-Rail Micropower DAC in MSOP
LTC1659CS8 Low-Power Dual LinCMOS<TM> Timer 14-CDIP -55 to 125
LTC1659CMS8 12-Bit Rail-to-Rail Micropower DAC in MSOP Package
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