AD780CR-REEL7 データシートの表示（PDF） - Analog Devices

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AD780CR-REEL7

2.5 V/3.0 V High Precision Reference

Analog Devices 

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.

+VIN

NC

NC

VOUT

AD780

TEMP

TRIM

1␮F

O/P SELECT

2.5V – NC

GND 3.0V – GND

VOUT – (V–)

R=

IL + IS MIN

V–

–2.5 VOUT

NOTE:

IL = LOAD CURRENT

IS MIN = MINIMUM SHUNT CURRENT

NC = NO CONNECT

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

AD780

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.

+5V

VIN

1k⍀

+5V

OUT AD780

CONNECT IF

–3V OUTPUT

DESIRED

OP07

2N3906

–2.5V (IL Յ 100mA)

–5V

–5V

1000pF

Figure 19. –2.5 V High Load Current Reference

REV. B

–9–

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