AD8202 Analog Devices, AD8202 Datasheet - Page 12

• Manufacturer Part Number: AD8202
• Description: High Common-Mode Voltage, Single-Supply Difference Amplifier
• Manufacturer: Analog Devices

Specifications of AD8202

• Filter Option: Yes
• Common Mode Input (v)min: --8V
• Common Mode Input (v)max: +28V
• Bandwidth G=10 (khz Typ): 50kHz
• Cmrr (db): 82dB
• Vcc-vee: 3.5V to 12V

AD8202
THEORY OF OPERATION
The
in Figure 40. Like-named resistors have equal values.
The preamp uses a dynamic bridge (subtractor) circuit.
Identical networks (within the shaded areas), consisting of R
R
Pin 8. When equal amplitude signals are asserted at Input 1 and
Input 8, and the output of A1 is equal to the common potential
(that is, 0), the two attenuators form a balanced-bridge network.
When the bridge is balanced, the differential input voltage at
A1, and thus its output, is 0.
Any common-mode voltage applied to both inputs keeps the
bridge balanced and the A1 output at 0. 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 R
input until it matches the voltage at its noninverting input.
By attenuating voltages at Pin 1 and Pin 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. R
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 Pin 1 and Pin 8.
R
B
G
, R
AD8202
+IN
C
8
, and R
R
R
R
B
C
A
B
COM
, by way of R
C
2
and R
consists of a preamp and buffer arranged as shown
G
R
R
R
, attenuate input signals applied to Pin 1 and
A
B
C
–IN
1
G
Figure 40. Simplified Schematic
form an attenuator that scales A1 feedback,
R
R
G
CM
G
, to adjust the voltage at its inverting
R
CM
A1
A3
(TRIMMED)
100kΩ
AD8202
3
4
A2
R
R
F
F
A
Rev. E | Page 12 of 20
,
5
To minimize these errors while extending the common-mode
range, a dedicated feedback loop is used to reduce the range of
common-mode voltage applied to A1 for a given overall range at
the inputs. By offsetting the voltage range applied to the com-
pensator, 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 R
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 (R
The 2-stage system architecture of the
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 the input bias current of A2. However, this current is
quite small, and errors resulting from applications that mismatch
the resistance are correspondingly small.
The A2 input bias current has a typical value of 40 nA, however,
this can increase under certain conditions. For example, if the
input signal to the A2 amplifier is V
go to V
because the maximum specified voltage for correct operation is
200 mV below V
current increases (see Figure 41 for more information).
CC
due to the gain of 2. However, the output saturates
CC
. Under these conditions the total input bias
CC
/2, the output attempts to
AD8202
CM
resistors to reduce
Data Sheet
enables the user
F
).