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AD628 bảng dữ liệu(PDF) 17 Page - Analog Devices

tên linh kiện AD628
Giải thích chi tiết về linh kiện  High Common-Mode Voltage Programmable Gain Difference Amplifier
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AD628 bảng dữ liệu(HTML) 17 Page - Analog Devices

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AD628
Rev. C | Page 17 of 20
CURRENT LOOP RECEIVER
Analog data transmitted on a 4 to 20 mA current loop may be
detected with the receiver shown in Figure 33. The AD628 is an
ideal choice for such a function, because the current loop must
be driven with a compliance voltage sufficient to stabilize the
loop, and the resultant common-mode voltage often exceeds
commonly used supply voltages. Note that with large shunt
values a resistance of equal value must be inserted in series with
the inverting input to compensate for an error at the
noninverting input.
MONITORING BATTERY VOLTAGES
Figure 34 illustrates how the AD628 may be used to monitor a
battery charger. Voltages approximately eight times the power
supply voltage may be applied to the input with no damage. The
resistor divider action is well suited for the measurement of
many power supply applications, such as those found in battery
chargers or similar equipment.
+IN
–IN
G = +0.1
10k
Ω
10k
Ω
AD628
+IN
–IN
A2
+VS
OUT
–IN
250
Ω
250
Ω
100k
Ω
A1
+15V
+IN
100k
Ω
CFILT
–VS
–15V
VREF
10k
Ω
REXT2
11k
Ω
REXT1
100k
Ω
2.5V
REF
0V TO 5V
TO ADC
4–20mA
SOURCE
RG
Figure 33. Level Shifter for 4 to 20 mA Current Loop
+IN
–IN
G = +0.1
10k
Ω
A1
–IN
100k
Ω
+VS
5V
VREF
–VS
+IN
–IN
A2
OUT
AD628
100k
Ω
10k
Ω
OTHER
BATTERIES IN
CHARGING
CIRCUIT
CHARGING
CIRCUIT
+1.5V
BATTERY
10k
Ω
+IN
nVBAT(V)
REXT1
10k
Ω
0V TO 5V
TO ADC
CFILT
RG
Figure 34. Battery Voltage Monitor



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