AD829SQ(RevI) 데이터 시트보기 (PDF) - Analog Devices

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AD829SQ
(Rev.:RevI)

High Speed, Low Noise Video Op Amp

Analog Devices 

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.

Data Sheet

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.

+VIN

RG

210Ω

+VIN

3pF

5 (G = 20)

3

A1

AD829 6

2

2pF TO 8pF

SETTLING TIME

AC CMR ADJUST

1kΩ

2kΩ

1pF

200Ω

2

A3

1pF

200Ω

AD848

6

3

2kΩ

5 (G = 5)

3pF

970Ω

2

A2

AD829 6

3

5 (G = 20)

DC CMR

ADJUST

50Ω

3pF

4000Ω

CIRCUIT GAIN = RG + 1 5

+15V

COMM

–15V

2kΩ

INPUT

FREQUENCY CMRR

100Hz

1MHz

10MHz

64.6dB

44.7dB

23.9dB

+VS

10µF

0.1µF

1µF

10µF

0.1µF

1µF

–VS

Figure 48. High Gain Video Bandwidth, 3-Op-Amp In-Amp Circuit

PIN 7

0.1µF

EACH

AMPLIFIER

0.1µF

PIN 4

Rev. I | Page 16 of 20

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