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AD8202 데이터시트(PDF) 8 Page - Analog Devices

부품명 AD8202
상세설명  High Common-Mode Voltage, Single-Supply Difference Amplifier
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홈페이지  http://www.analog.com
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AD8202 데이터시트(HTML) 8 Page - Analog Devices

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AD8202
Rev. A | Page 8 of 12
THEORY OF OPERATION
The AD8202 consists of a preamp and buffer arranged as shown
in Figure 14. Like-named resistors have equal values.
The preamp incorporates a dynamic bridge (subtractor) circuit.
Identical networks (within the shaded areas), consisting of RA,
RB, RC, and RG, attenuate input signals applied to Pins 1 and 8.
Note that when equal amplitude signals are asserted at inputs 1
and 8, and the output of A1 is equal to the common potential
(i.e., zero), the two attenuators form a balanced-bridge network.
When the bridge is balanced, the differential input voltage at A1,
and thus its output, is zero.
Any common-mode voltage applied to both inputs keeps the
bridge balanced and the A1 output at zero. Because the resistor
networks are carefully matched, the common-mode signal
rejection approaches this ideal state.
However, if the signals applied to the inputs differ, the result is a
difference at the input to A1. A1 responds by adjusting its output
to drive RB, by way of RG, to adjust the voltage at its inverting
input until it matches the voltage at its noninverting input.
By attenuating voltages at Pins 1 and 8, the amplifier inputs are
held within the power supply range, even if Pin 1 and Pin 8
input levels exceed the supply, or fall below common (ground).
The input network also attenuates normal (differential) mode
voltages. RC and RG form an attenuator that scales A1 feedback,
forcing large output signals to balance relatively small differen-
tial inputs. The resistor ratios establish the preamp gain at 10.
Because the differential input signal is attenuated and then
amplified to yield an overall gain of 10, Amplifier A1 operates at
a higher noise gain, multiplying deficiencies such as input offset
voltage and noise with respect to Pins 1 and 8.
A1
A3
RCM
RCM
(TRIMMED)
100k
RA
–IN
RG
RC
RB
RA
RC
RB
RG
+IN
COM
A2
RF
RF
AD8202
5
4
3
1
2
8
Figure 14. Simplified Schematic
To minimize these errors while extending the common-mode
range, a dedicated feedback loop is employed to reduce the
range of common-mode voltage applied to A1 for a given over-
all range at the inputs. By offsetting the range of voltage applied
to the compensator, the input common-mode range is also
offset to include voltages more negative than the power supply.
Amplifier A3 detects the common-mode signal applied to A1
and adjusts the voltage on the matched RCM resistors to reduce
the common-mode voltage range at the A1 inputs. By adjusting
the common voltage of these resistors, the common-mode input
range is extended while, at the same time, the normal mode
signal attenuation is reduced, leading to better performance
referred to input.
The output of the dynamic bridge taken from A1 is connected
to Pin 3 by way of a 100 kΩ series resistor, provided for low-
pass filtering and gain adjustment. The resistors in the input
networks of the preamp and the buffer feedback resistors are
ratio trimmed for high accuracy.
The output of the preamp drives a gain-of-2 buffer amplifier,
A2, implemented with carefully matched feedback resistors RF.
The 2-stage system architecture of the AD8202 enables the user
to incorporate a low-pass filter prior to the output buffer. By
separating the gain into two stages, a full-scale, rail-to-rail signal
from the preamp can be filtered at Pin 3, and a half-scale signal,
resulting from filtering, can be restored to full scale by the
output buffer amp. The source resistance seen by the inverting
input of A2 is approximately 100 kΩ to minimize the effects of
A2’s input bias current. However, this current is quite small and
errors resulting from applications that mismatch the resistance
are correspondingly small.


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