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AD829 Datasheet(PDF) 16 Page - Analog Devices

Part # AD829
Description  High Speed, Low Noise Video Op Amp
PDF  20 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD829 Datasheet(HTML) 16 Page - Analog Devices

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AD829
Data Sheet
Rev. I | Page 16 of 20
HIGH GAIN VIDEO BANDWIDTH, 3-OP-AMP
INSTRUMENTATION AMPLIFIER
Figure 48 shows a 3-op-amp instrumentation amplifier circuit
that provides a gain of 100 at video bandwidths. At a circuit gain of
100, the small signal bandwidth equals 18 MHz into a FET probe.
Small signal bandwidth equals 6.6 MHz with a 50 Ω load. The
0.1% settling time is 300 ns.
The input amplifiers operate at a gain of 20, while the output
op amp runs at a gain of 5. In this circuit, the main bandwidth
limitation is the gain/bandwidth product of the output amplifier.
Extra care should be taken while breadboarding this circuit
because even a couple of extra picofarads of stray capacitance at the
compensation pins of A1 and A2 will degrade circuit bandwidth.
Figure 48. High Gain Video Bandwidth, 3-Op-Amp In-Amp Circuit
+15V
–15V
COMM
10µF
10µF
0.1µF
0.1µF
1µF
1µF
0.1µF
0.1µF
+VS
–VS
PIN 4
EACH
AMPLIFIER
PIN 7
100Hz
1MHz
10MHz
64.6dB
44.7dB
23.9dB
INPUT
FREQUENCY
CMRR
A1
AD829
2pF TO 8pF
SETTLING TIME
AC CMR ADJUST
3pF
3pF
1pF
1pF
2kΩ
200Ω
RG
210Ω
1kΩ
2kΩ
200Ω
970Ω
50Ω
2kΩ
(G = 5)
5
3
2
6
DC CMR
ADJUST
3pF
(G = 20)
(G = 20)
A2
AD829
A3
AD848
+VIN
+VIN
CIRCUIT GAIN =
+ 1
4000Ω
RG
5
5
2
3
6
5
3
2
6



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