2-Terminal IC
1.2 V Reference
AD589
FEATURES
Superior Replacement for Other 1.2 V References
Wide Operating Range: 50
A
to 5 mA
Low Power: 60
W
Total P
D
at 50
A
Low Temperature Coefficient:
10 ppm/C Max, 0C to 70C (AD589M)
2-Terminal Zener Operation
Low Output Impedance: 0.6
No Frequency Compensation Required
Low Cost
MIL-STD-883 Compliant Versions Available
FUNCTIONAL BLOCK DIAGRAMS
SOIC (R-8)
1
2
3
8
7
6
Metal Can (H-02)
½½
+V
–V
4
AD589
TOP VIEW
(Not to Scale)
5
½½
½½½½½½ ½½½½
PRODUCT DESCRIPTION
PRODUCT HIGHLIGHTS
The AD589 is a 2-terminal, low cost, temperature compensated
band gap voltage reference that provides a fixed 1.23 V output
voltage for input currents between 50
A
and 5.0 mA.
The high stability of the AD589 is primarily dependent upon
the matching and thermal tracking of the on-chip components.
Analog Devices’ precision bipolar processing and thin-film tech-
nology combine to provide excellent performance at low cost.
Additionally, the active circuit produces an output impedance 10
lower than the typical low-TC Zener diodes. This feature allows
operation with no external components required to maintain full
accuracy under changing load conditions.
The AD589 is available in seven versions. The AD589J, AD589K,
AD589L, and AD589M grades are specified for 0°C to +70°C
operation, while the AD589S and AD589T grades are rated for
the full –55°C to +125°C temperature range. All grades are avail-
able in a metal can (H-02) package. The AD589J is also available
in an 8-lead SOIC package.
1. The AD589 is a 2-terminal device that delivers a constant
reference voltage for a wide range of input current.
2. Output impedance of 0.6
and temperature coefficients as
low as 10 ppm/°C ensure stable output voltage over a wide
range of operating conditions.
3. The AD589 can be operated as a positive or negative refer-
ence. Floating operation is also possible.
4. The AD589 will operate with a total current as low as 50
A
(60
W
total power dissipation), ideal for battery-powered
instrument applications.
5. The AD589 is an exact replacement for other 1.2 V references,
offering superior temperature performance and reduced sensi-
tivity to capacitive loading.
6. The AD589 is available in versions compliant with MIL-
STD-883. Consult factory for 883 data sheet.
REV. C
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
that may result from its use. No license is granted by implication or oth-
erwise under any patent or patent rights of Analog Devices. Trademarks
and registered trademarks are the property of their respective owners.
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.O.
Tel: 781/329-4700
Fax: 781/326-8703
© 2004 Analog Devices, Inc. All rights reserved.
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