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AD589 Просмотр технического описания (PDF) - Analog Devices

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AD589

2-Terminal IC 1.2 V Reference

Analog Devices

AD589 Datasheet PDF : 8 Pages

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AD589

APPLICATION INFORMATION

The AD589 functions as a 2-terminal shunt-type regulator. It

provides a constant 1.23 V output for a wide range of input

current from 50 A to 5 mA. Figure 5 shows the simplest con-

figuration for an output voltage of 1.2 V or less. Note that no

frequency compensation is required. If additional filtering is

desired for ultralow noise applications, minimum recommended

capacitance is 1000 pF.

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Figure 5. Basic Configuration for 1.2 V or Less

The AD589 can also be used as a building block to generate

other values of reference voltage. Figure 6 shows a circuit that

produces a buffered 10 V output. Total supply current for this

circuit is approximately 2 mA.

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Figure 6. Single-Supply Buffered 10 V Reference

The low power operation of the AD589 makes it ideal for use in

battery-operated portable equipment. It is especially useful as a

reference for CMOS analog-to-digital converters. Figure 7 shows

the AD589 used in conjunction with two popular integrating type

CMOS ADCs.

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a. With 7109 12-Bit Binary ADC

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b. With 7107 Panel Meter ADC

Figure 7. AD589 Used as Reference for CMOS ADCs

The AD589 also is useful as a reference for CMOS multiplying

DACs, such as the AD7533. These DACs require a negative

reference voltage in order to provide a positive output range.

Figure 8 shows the AD589 used to supply an equivalent –1.0 V

reference to an AD7533.

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Figure 8. AD589 as Reference for 10-Bit CMOS DAC

REV. C

–5–

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