AD746JN 查看數據表（PDF） - Analog Devices

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AD746JN

Dual Precision, 500 ns Settling, BiFET Op Amp

Analog Devices 

A HIGH SPEED 3 OR AMP INSTRUMENTATION

AMPLIFIER CIRCUIT

The instrumentation amplifier circuit shown in Figure 23 can

provide a range of gains from 2 up to 1000 and higher. The

circuit bandwidth is 2.5 MHz at a gain of 2 and 750 kHz at a

gain of 10; settling time for the entire circuit is less than 2 µs to

within 0.01% for a 10 volt step, (G = 10).

AD746

Table I. Performance Summary for the 3 Op Amp

Instrumentation Amplifier Circuit

Gain

2

10

100

RG

20 kΩ

4.04 kΩ

404 Ω

Bandwidth

2.5 MHz

1 MHz

290 kHz

TSETTLE

(0.01%)

1.0 µs

2.0 µs

5.0 µs

Figure 23. A High Performance, 3 Op Amp, Instrumenta-

tion Amplifier Circuit

Figure 25. Settling Time of the 3 Op

Amp Instrumentation Amplifier.

Gain = 10, Horizontal Scale: 0.5 µs/Div,

Vertical Scale: 5 V/Div.

Error Signal Scale: 0.01%/Div.

THD Performance Considerations

The AD746 was carefully optimized to offer excellent

performance in terms of total harmonic distortion (THD) in

signal processing applications. The THD level when operating

the AD746 in inverting gain applications will show a gradual

rise from the distortion floor of 20 dB/decade (see Figure 28).

In noninverting applications, care should be taken to balance

the source impedances at both the inverting and noninverting

inputs, to avoid distortion caused by the modulation of input

capacitance inherent in all BiFET op amps.

Figure 24. Pulse Response of the 3

Op Amp Instrumentation Amplifier.

Gain = 10, Horizontal Scale:

0.5 µs/Div, Vertical Scale: 5 V/Div.

REV. B

Figure 26. THD Measurement, Inverter Circuit

Figure 27. THD Measurement, Follower Circuit

–7–

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