AD588KQ Просмотр технического описания (PDF) - Analog Devices

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AD588KQ

High Precision Voltage Reference

Analog Devices 

AD588

Figure 16. High Accuracy ±5 V Tracking Reference for AD569

12-Bit Analog-to-Digital Converter—AD574A

The AD574A is specified for gain drift from 10 ppm/°C to

50 ppm/°C, (depending on grade) using the on-chip reference.

The reference contributes typically 75% of this drift. Therefore,

the total drift using an AD588 to supply the reference can be

improved by a factor of 3 to 4.

Using this combination may result in apparent increases in full-

scale error due to the difference between the on-board reference

by which the device is laser trimmed and the external reference

with which the device is actually applied. The on-board refer-

ence is specified to be 10 V ± 100 mV while the external refer-

ence is specified to be 10 V ± 1 mV. This may result in up to

101 mV of apparent full-scale error beyond the ± 25 mV speci-

fied AD574 gain error. Resistors R2 and R3 allow this error to

be nulled. Their contribution to full-scale drift is negligible.

The high output drive capability allows the AD588 to drive up

to 6 converters in a multi-converter system. All converters will

have gain errors that track to better than ± 5 ppm/°C.

REV. B

Figure 17. AD588/AD574A Connections

–10–

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