AD588 データシートの表示（PDF） - Analog Devices

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AD588

High Precision Voltage Reference

Analog Devices 

Figure 14b. Compensation for Capacitive Loads

Figure 14c. Output Amplifier Step Response Using Figure

14b Compensation

AD588

USING THE AD588 WITH CONVERTERS

The AD588 is an ideal reference for a wide variety of A/D and

D/A converters. Several representative examples follow.

14-Bit Digital-to-Analog Converter—AD7535

High resolution CMOS D/A converters require a reference volt-

age of high precision to maintain rated accuracy. The combina-

tion of the AD588 and AD7535 takes advantage of the initial

accuracy, drift and full Kelvin output capability of the AD588 as

well as the resolution, monotonicity and accuracy of the AD7535

to produce a subsystem with outstanding characteristics.

16-Bit Digital-to-Analog Converter—AD569

Another application which fully utilizes the capabilities of the

AD588 is supplying a reference for the AD569, as shown in Fig-

ure 16. Amplifier A2 senses system common and forces VCT to

assume this value, producing +5 V and –5 V at Pins 6 and 8

respectively. Amplifiers A3 and A4 buffer these voltages out to

the appropriate reference force-sense pins of the AD569. The

full Kelvin scheme eliminates the effect of the circuit traces or

wires and the wire bonds of the AD588 and AD569 themselves,

which would otherwise degrade system performance.

SUBSTITUTING FOR INTERNAL REFERENCES

Many converters include built-in references. Unfortunately,

such references are the major source of drift in these converters.

By using a more stable external reference like the AD588, drift

performance can be improved dramatically.

Figure 15. AD588/AD7535 Connections

REV. B

–9–

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