V
參數(shù)資料
型號(hào): AD694ARZ-REEL
廠(chǎng)商: Analog Devices Inc
文件頁(yè)數(shù): 4/16頁(yè)
文件大?。?/td> 0K
描述: IC TRANSMITTER 4-20MA 16SOIC
標(biāo)準(zhǔn)包裝: 1
系列: *
其它名稱(chēng): AD694ARZ-REELDKR
AD694
–12–
REV. B
Figure 15. Low Cost Sensor Transmitter
The circuit shown, will convert a positive differential signal at
VIN to a 4–20 mA current. The circuit has common-mode range
of 3 V to 8 V. The low end of the common-mode range is limited
by the AD708’s ability to pull down on RS. A single supply am-
plifier could be used instead to extend the common-mode range
down to about 1.5 V.
As shown, the circuit handles positive differential signals (VIN
positive). To handle bipolar differential signals (VIN is positive
or negative), the reference pin of the in amp (Point C) must be
offset positively from the 2 V reference. For example, discon-
necting Point C from the 2 V reference and connecting it to a
3 V source would result in a VA of 1 V (or half scale) for a zero
volt differential input from the sensor.
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