AD829 Analog Devices, AD829 Datasheet - Page 16

• Manufacturer Part Number: AD829
• Description: High Speed, Low Noise Video Op Amp
• Manufacturer: Analog Devices

Specifications of AD829

• -3db Bandwidth: 120MHz
• Slew Rate: 230V/µs
• Vos: 200µV
• Ib: 3.3µA
• # Opamps Per Pkg: 1
• Input Noise (nv/rthz): 1.7nV/rtHz
• Vcc-vee: 9V to 36V
• Isy Per Amplifier: 6.5mA
• Packages: DIP,LCC,SOIC

AD829
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.
+V
+V
210Ω
IN
IN
R
G
3
2
2
3
AD829
AD829
A1
A2
5
5
2kΩ
1pF
1pF
2kΩ
3pF
3pF
(G = 20)
(G = 20)
6
6
CIRCUIT GAIN =
200Ω
200Ω
Figure 48. High Gain Video Bandwidth, 3-Op-Amp In-Amp Circuit
3pF
970Ω
50Ω
DC CMR
ADJUST
4000Ω
AC CMR ADJUST
2
3
SETTLING TIME
R
G
2pF TO 8pF
AD848
A3
+ 1
1kΩ
5
5
(G = 5)
Rev. I | Page 16 of 20
6
COMM
+15V
–15V
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.
2kΩ
10µF
10µF
FREQUENCY CMRR
100Hz
1MHz
10MHz
0.1µF
0.1µF
INPUT
+V
–V
64.6dB
44.7dB
23.9dB
S
S
1µF
1µF
0.1µF
0.1µF
PIN 7
PIN 4
EACH
AMPLIFIER
Data Sheet