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AD626AR-REEL7 датащи(PDF) 9 Page - Analog Devices

номер детали AD626AR-REEL7
подробное описание детали  Low Cost, Single Supply Differential Amplifier
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

AD626AR-REEL7 датащи(HTML) 9 Page - Analog Devices

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AD626
REV. C
–9–
10
90
100
0%
Figure 25. Settling Time. VS = +5 V, G = 10
10
90
100
0%
Figure 26. Settling Time. VS = +5 V, G = 100
10k
10k
10k
INPUT
20V p–p
1k
+VS
AD626
–VS
ERROR
OUT
2k
Figure 27. Settling Time Test Circuit
THEORY OF OPERATION
The AD626 is a differential amplifier consisting of a precision
balanced attenuator, a very low drift preamplifier (A1), and an
output buffer amplifier (A2). It has been designed so that small
differential signals can be accurately amplified and filtered in the
presence of large common-mode voltages (VCM), without the
use of any other active components.
Figure 28 shows the main elements of the AD626. The signal
inputs at Pins 1 and 8 are first applied to dual resistive attenuators
R1 through R4 whose purpose is to reduce the peak common-
mode voltage at the input to the preamplifier—a feedback stage
based on the very low drift op amp A1. This allows the differen-
tial input voltage to be accurately amplified in the presence of
large common-mode voltages six times greater than that which
can be tolerated by the actual input to A1. As a result, the input
CMR extends to six times the quantity (VS – 1 V). The overall
common-mode error is minimized by precise laser-trimming of
R3 and R4, thus giving the AD626 a common-mode rejection
ratio (CMRR) of at least 10,000:1 (80 dB).
To minimize the effect of spurious RF signals at the inputs due
to rectification at the input to A1, small filter capacitors C1 and
C2 are included.
AD626
C1
5pF
+IN
–IN
R1
200k
R2
200k
R3
41k
C2
5pF
R4
41k
R5
4.2k
R11
10k
R6
500
R7
500
R8
10k
R10
10k
R14
555
GND
GAIN = 100
R13
10k
R15
10k
R17
95k
R9
10k
R12
100k
FILTER
OUT
+VS
A1
A2
–VS
Figure 28. Simplified Schematic


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