AD780AN datasheet(9/10 Pages) AD

部件名	AD780AN

功能描述	2.5 V/3.0 V High Precision Reference

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制造商	AD [Analog Devices]

网页	http://www.analog.com

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9 / 10 page

AD780

REV. B

–9–

NEGATIVE (–2.5 V OR –3.0 V) REFERENCE

The AD780 can produce a negative output voltage in shunt

mode, simply by connecting the input and output to ground

connecting the AD780’s GND pin to a negative supply via a

bias resistor as shown in Figure 18.

NC

TEMP

+VIN

VOUT

TRIM

GND

O/P SELECT

2.5V – NC

3.0V – GND

NC

1 F

AD780

V–

–2.5 VOUT

NOTE:

IL = LOAD CURRENT

IS MIN = MINIMUM SHUNT CURRENT

NC = NO CONNECT

VOUT – (V–)

IL + IS MIN

R =

Figure 18. Negative (–2.5 V) Shunt Mode Reference

A precise –2.5 V (or –3.0 V) reference capable of supplying up

to 100 mA to a load can be implemented with the AD780 in se-

ries mode using the bootstrap circuit following.

AD780

2N3906

+5V

OP07

CONNECT IF

–3V OUTPUT

DESIRED

–5V

–2.5V (IL

100mA)

–5V

OUT

1k

1000pF

VIN

Figure 19. –2.5 V High Load Current Reference

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Analog Devices	AD780ANZ	264Kb / 12P	2.5 V-3.0 V High Precision Reference Rev. F

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