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AD589SH Datasheet(PDF) 4 Page - Analog Devices

No. de pieza AD589SH
Descripción Electrónicos  Two-Terminal IC 1.2 V Reference
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

AD589SH Datasheet(HTML) 4 Page - Analog Devices

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AD589
REV. B
–4–
APPLICATION INFORMATION
The AD589 functions as a two-terminal shunt-type regulator. It
provides a constant 1.23 V output for a wide range of input
current from 50
µA to 5 mA. Figure 5 shows the simplest
configuration 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.
6.8k
10k
AD589
V
OUT
+5V
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 which
produces a buffered 10 V output. Total supply current for this
circuit is approximately 2 mA.
AD589
+15V
7
6
8
1
4
3
2
0.01µF
AD108A
15k
1k
1k
8.2k
10V
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 A/D converters.
AD589
5.6k
6.8k
2k
+5V
+V
7109
REF+
REF–
REF OUT
a. With 7109 12-Bit Binary A/D
AD589
6.2k
10k
1k
+5V
+V
7107
REF HI
REF LO
COMMON
b. With 7107 Panel Meter A/D
Figure 7. AD589 Used as Reference for CMOS
A/D Converters
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.
AD589
2
1
16
RFB
OUT1
OUT2
REF
GND
VDD
+15V
R2
5k
14
15
3
R1
39k
–15V
VOUT =
0 TO 1.00V
MSB
LSB
2
345
67
89
BIT
1
BIT
10
AD7533 SERIES
AD542L
Figure 8. AD589 as Reference for 10-Bit CMOS DAC
OUTLINE DIMENSIONS AND PIN DESIGNATIONS
Dimensions shown in inches and (mm).
0.10 (2.54)
45°
0.500 (12.7)
MIN
DIA
0.195 (4.95)
0.178 (4.52)
0.028 (0.71)
0.048 (1.22)
0.036 (0.91)
0.046 (1.17)
DIA
0.209 (5.31)
0.230 (5.84)
0.150 (3.81)
0.125 (3.17)
0.015 (0.38)
0.019 (0.48)


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