5962-9063302MCA Ver la hoja de datos (PDF) - Analog Devices

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5962-9063302MCA

Quad Precision, Low Cost, High Speed, BiFET Op Amp

Analog Devices 

AD713

A HIGH SPEED INSTRUMENTATION AMPLIFIER

CIRCUIT

The instrumentation amplifier circuit shown in Figure 5 can

provide a range of gains from unity up to 1000 and higher using

only a single AD713. The circuit bandwidth is 1.2 MHz at a

gain of 1 and 250 kHz at a gain of 10; settling time for the entire

circuit is less than 5 µs to within 0.01% for a 10 V step, (G = 10).

Other uses for amplifier A4 include an active data guard and an

active sense input.

A HIGH SPEED FOUR OP AMP CASCADED AMPLIFIER

CIRCUIT

Figure 7 shows how the four amplifiers of the AD713 may be

connected in cascade to form a high gain, high bandwidth am-

plifier. This gain of 100 amplifier has a –3 dB bandwidth greater

than 600 kHz.

Figure 7. A High Speed Four Op Amp Cascaded

Amplifier Circuit

Figure 5. A High Speed Instrumentation Amplifier Circuit

Table I provides a performance summary for this circuit. The

photo of Figure 6 shows the pulse response of this circuit for a

gain of 10.

Table I. Performance Summary for the High Speed

Instrumentation Amplifier Circuit

Gain

1

2

10

RG

NC

20 kΩ

4.04 kΩ

Bandwidth

1.2 MHz

1.0 MHz

0.25 MHz

T Settle (0.01%)

2 µs

2 µs

5 µs

Figure 6. The Pulse Response of the High Speed

Instrumentation Amplifier. Gain = 10

Figure 8. THD Test Circuit

HIGH SPEED OP AMP APPLICATIONS AND

TECHNIQUES

DAC Buffers (I-to-V Converters)

The wide input dynamic range of JFET amplifiers makes them

ideal for use in both waveform reconstruction and digital-audio

DAC applications. The AD713, in conjunction with the AD1860

DAC, can achieve 0.0016% THD (here at a 4fs or a 176.4 kHz

update rate) without requiring the use of a deglitcher. Just such

a circuit is shown in Figure 9. The 470 pF feedback capacitor

used with IC2a, along with op amp IC2b and its associated

components, together form a 3-pole low-pass filter. Each or all

of these poles can be tailored for the desired attenuation and

phase characteristics required for a particular application. In this

application, one half of an AD713 serves each channel in a two-

channel stereo system.

–8–

REV. C

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