參數(shù)資料
型號: LTC1451CN8
廠商: Linear Technology
文件頁數(shù): 12/12頁
文件大?。?/td> 0K
描述: IC D/A CONV 12BIT R-R 8-DIP
標準包裝: 50
設置時間: 14µs
位數(shù): 12
數(shù)據(jù)接口: 串行
轉(zhuǎn)換器數(shù)目: 1
電壓電源: 單電源
功率耗散(最大): 2mW
工作溫度: 0°C ~ 70°C
安裝類型: 通孔
封裝/外殼: 8-DIP(0.300",7.62mm)
供應商設備封裝: 8-PDIP
包裝: 管件
輸出數(shù)目和類型: 1 電壓,單極;1 電壓,雙極
采樣率(每秒): *
9
LTC1451
LTC1452/LTC1453
sn145123 145123fas
An Isolated 4mA to 20mA Process Controller
Has 3.3V Minimum Loop Voltage
11451/2/3 TA04
3k
10k
1k
45k
5k
90k
5k
Q1
2N3440
RS
10
VLOOP
3.3V TO 30V
IOUT
OUT
IN
CLK
DIN
CS/LD
CLK
DIN
CS/LD
CLK
DIN
CS/LD
VCC
VOUT
1
F
LTC1453
4N28
OPTO-ISOLATORS
3.3V
500
LT
1121-3.3
FROM
OPTO-
ISOLATED
INPUTS
VREF
+
LT1077
This circuit shows how to use an LTC1453 to make an
opto-isolated digitally controlled 4mA to 20mA process
controller. The controller circuitry, including the opto-
isolation, is powered by the loop voltage that can have a
wide range of 3.3V to 30V. The 1.22V reference output of
the LTC1453 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.
Note that although these DACs have internal Schmitt
triggers and are suitable for use with slow rising edges
such as produced by the above optoisolator, the use of
optoisolators in a daisy-chained topology requires the
addition of a gate or the use of a fast isolator on the clock
signal. Setup and hold times between DOUT and DIN are not
guaranteed unless a clock edge with a rise time of less than
100ns is provided.
TYPICAL APPLICATIO S
U
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