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AD628 bảng dữ liệu(PDF) 14 Page - Analog Devices

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Giải thích chi tiết về linh kiện  High Common-Mode Voltage Programmable Gain Difference Amplifier
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AD628 bảng dữ liệu(HTML) 14 Page - Analog Devices

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AD628
Rev. C | Page 14 of 20
THEORY OF OPERATION
The AD628 is a high common-mode voltage difference
amplifier, combined with a user configurable output amplifier
(see Figure 28 and Figure 29). Differential mode voltages in
excess of 120 V are accurately scaled by a precision 11:1 voltage
divider at the input. A reference voltage input is available to the
user at Pin 3 (VREF). The output common-mode voltage of the
difference amplifier is the same as the voltage applied to the
reference pin. If the uncommitted amplifier is configured for
gain, connecting Pin 3 to one end of the external gain resistor
establishes the output common-mode voltage at Pin 5 (OUT).
The output of the difference amplifier is internally connected
to a 10 kΩ resistor trimmed to better than ±0.1% absolute
accuracy. The resistor is connected to the noninverting input of
the output amplifier and is accessible to the user at Pin 4 (CFILT).
A capacitor may be connected to implement a low-pass filter, a
resistor may be connected to further reduce the output voltage,
or a clamp circuit may be connected to limit the output swing.
The uncommitted amplifier is a high open-loop gain, low offset,
low drift op amp, with its noninverting input connected to the
internal 10 kΩ resistor. Both inputs are accessible to the user.
Careful layout design has resulted in exceptional common-
mode rejection at higher frequencies. The inputs are connected
to Pin 1 (+IN) and Pin 8 (−IN), which are adjacent to the power
Pin 2 (−VS) and Pin 7 (+VS). Because the power pins are at ac
ground, input impedance balance and, therefore, common-
mode rejection, are preserved at higher frequencies.
+IN
–IN
+IN
–IN
A2
A1
+IN
–IN
100k
Ω
100k
Ω
10k
Ω
10k
Ω
VREF
10k
Ω
OUT
G = +0.1
CFILT
RG
Figure 28. Simplified Schematic
+VS
+IN
–IN
–VS
A2
+IN
–IN
100k
Ω
100k
Ω
10k
Ω
10k
Ω
VREF
REFERENCE
VOLTAGE
10k
Ω
AD628
OUT
G = +0.1
RG
REXT3
CFILT
REXT2
REXT1
+IN
–IN
A1
Figure 29. Circuit Connections



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