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AD780BN Folha de dados(PDF) 9 Page - Analog Devices

Nome de Peças AD780BN
Descrição Electrónicos  2.5 V/3.0 V High Precision Reference
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
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AD780BN Folha de dados(HTML) 9 Page - Analog Devices

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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
+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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