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AD628ARZ-R7 Scheda tecnica(PDF) 15 Page - Analog Devices

Il numero della parte AD628ARZ-R7
Spiegazioni elettronici  High Common-Mode Voltage, Programmable Gain Difference Amplifier
PDF  20 Pages
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD628ARZ-R7 Scheda tecnica(HTML) 15 Page - Analog Devices

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AD628
Rev. G | Page 15 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, connect Pin 3 to one end of the external gain resistor to
establish 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 at Pin 4 (CFILT). A capacitor
can be connected to implement a low-pass filter, a resistor can
be connected to further reduce the output voltage, or a clamp
circuit can 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
pins, 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
100kΩ
100kΩ
10kΩ
10kΩ
VREF
10kΩ
OUT
G = +0.1
CFILT
RG
5
6
4
3
1
8
Figure 28. Simplified Schematic
+VS
+IN
–IN
–VS
A2
+IN
–IN
100kΩ
100kΩ
10kΩ
10kΩ
VREF
REFERENCE
VOLTAGE
10kΩ
AD628
OUT
G = +0.1
RG
REXT3
CFILT
REXT2
REXT1
+IN
–IN
A1
5
3
2
1
8
6
4
7
Figure 29. Circuit Connections



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