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.
One Technology Way, P Box 9106, Norwood, MA 02062-9106, U.S.A.
.O.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© 2004 Analog Devices, Inc. All rights reserved.
AD589–SPECIFICATIONS
(Typical @ I
Model
OUTPUT VOLTAGE, T
A
= 25°C
OUTPUT VOLTAGE CHANGE
VERSUS CURRENT
50
A
to 5 mA
DYNAMIC OUTPUT IMPEDANCE
RMS NOISE VOLTAGE
10 Hz < f < 10 kHz
TEMPERATURE COEFFICIENT
1
TURN-ON SETTLING TIME TO 0.1%
OPERATING CURRENT
2
OPERATING TEMPERATURE
PACKAGE OPTION
3
Metal Can (H-02A)
SOIC (R-8)
0.05
0
25
5
70
AD589JH
AD589JR
0.05
0
0.6
5
100
IN
= 500
A
and T
A
= 25C, unless otherwise noted.)
AD589LH
Min Typ Max
1.200
1.235
1.250
AD589JH/
AD589JR
Min Typ Max
1.200
1.235
1.250
AD589KH
Min Typ Max
1.200
1.235
1.250
AD589MH
Min Typ Max
1.200
1.235
1.250
Unit
V
5
2
0.6
5
5
2
0.6
5
50
25
5
70
AD589KH
0.05
0
25
5
2
0.6
5
25
25
5
70
AD589LH
0.05
0
5
2
mV
V
10
ppm/°C
s
5
70
AD589MH
mA
°C
Model
OUTPUT VOLTAGE, T
A
= 25°C
OUTPUT VOLTAGE CHANGE
VERSUS CURRENT
50
A
to 5 mA
DYNAMIC OUTPUT IMPEDANCE
RMS NOISE VOLTAGE
10 Hz < f < 10 kHz
TEMPERATURE COEFFICIENT
1
TURN-ON SETTLING TIME TO 0.1%
OPERATING CURRENT
2
OPERATING TEMPERATURE
PACKAGE OPTION
3
Metal Can (H-02)
SOIC (R-8)
AD589SH
Min Typ Max
1.200
1.235
1.250
AD589TH
Min Typ Max
1.200
1.235
1.250
Unit
V
5
0.6
5
100
25
0.05
–55
5
+125
AD589SH
AD589JR
0.05
–55
25
2
0.6
5
5
2
mV
V
50
ppm/°C
s
5
+125
AD589TH
mA
°C
NOTES
1
See the Voltage Variation versus Temperature section for explanation of temperature coefficient measurement method.
2
Optimum performance is obtained at currents below 500
A.
For current operation below 200
A,
stray shunt capacitances should be limited to 20 pF or increased to
1
F.
If strays cannot be avoided, operation at 500
A
and a shunt capacitor of at least 1000 pF are recommended.
3
H = Hermetic Metal Can; R = SOIC.
Specifications shown in
boldface
are tested on all production units at final electrical test.
Specifications subject to change without notice.
–2–
REV. C
AD589
ABSOLUTE MAXIMUM RATINGS
AD589 CHIP DIMENSIONS AND PAD LAYOUT
Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mA
Reverse Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mA
Power Dissipation* . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 mW
Storage Temperature . . . . . . . . . . . . . . . . . . . . –65°C to +175°C
Operating Junction Temperature Range . . . . . . –55°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . . . .300°C
*Absolute
maximum power dissipation is limited by maximum current through the
device. Maximum rating at elevated temperatures must be computed assuming
T
J
150°C and
JA
= 400 = C/W.
½½½½½
½½½½½½½
½½½½½
½½½½½½½
½½½ ½½½½½ ½½ ½½½½½½½½½ ½½ ½½½½ ½½½½ ½½½½ ½½½½½ ½½½½½½
½½½ ½½½½½½½½½½ ½½½½½½½½½½½½½½½ ½½½½½½½ ½½½½½½½ ½½½
½½½½½½½½½ ½½½½½½ ½½½ ½½½½½½½½
ORDERING GUIDE
Model
AD589JH
AD589JR
AD589JRZ*
AD589JR-REEL
AD589JRZ-REEL*
AD589JCHIPS
AD589KH
AD589LH
AD589MH
AD589SH
AD589SH/883B
AD589TH
AD589TH/883B
AD589TCHIPS
*Z
= Pb-free part
Temperature
Coefficient (ppm/C)
100
100
100
100
100
100
50
25
10
100
100
50
50
50
Package Description
Metal Can (TO-51)
SOIC-8
SOIC-8
SOIC-8
SOIC-8
DICE
Metal Can (TO-51)
Metal Can (TO-51)
Metal Can (TO-51)
Metal Can (TO-51)
Metal Can (TO-51)
Metal Can (TO-51)
Metal Can (TO-51)
DICE
Package Option
H-02
R-8
R-8
R-8
R-8
—
H-02
H-02
H-02
H-02
H-02
H-02
H-02
—
No. of Parts Per
Reel/Tray
100
98
98
2,500
2,500
25
100
100
100
100
100
100
100
25
Temperature
Range (C)
0 to +70
0 to +70
0 to +70
0 to +70
0 to +70
0 to +70
0 to +70
0 to +70
0 to +70
–55 to +125
–55 to +125
–55 to +125
–55 to +125
–55 to +125
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily accumulate
on the human body and test equipment and can discharge without detection. Although the AD589 features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
REV. C
–3–
AD589
UNDERSTANDING THE SPECIFICATIONS
Voltage Variation Versus Temperature
Dynamic Performance
Some confusion exists in the area of defining and specifying
reference voltage error over temperature. Historically, references
have been characterized using a maximum deviation per degree
Centigrade, i.e., 10 ppm/°C. However, because of nonlinearities
in temperature characteristics, which originated in standard Zener
references (such as S type characteristics), most manufacturers
have begun to use a maximum limit error band approach to specify
devices. This technique involves measurement of the output at
3, 5, or more different temperatures to guarantee that the output
voltage will fall within the given error band. The temperature
characteristics of the AD589 consistently follows the curve shown
in Figure 1. Three-point measurement guarantees the error band
over the specified temperature range. The temperature coefficients
specified in the Specifications section represent the slopes of the
diagonals of the error band from 25°C to T
MIN
and 25°C to T
MAX
.
½½½½½½
Many low power instrument manufacturers are becoming increas-
ingly concerned with the turn-on characteristics of the components
being used in their systems. Fast turn-on components often enable
the end user to keep power off when not needed and yet respond
quickly when the power is turned on for operation. Figure 3 dis-
plays the turn-on characteristics of the AD589. This characteristic
is generated from cold-start operation and represents the true turn-
on waveform after an extended period with the supplies off. The
figure shows both the coarse and fine transient characteristics of
the device; the total settling time to within ±1 mV is about 25
s,
and there is no long thermal tail appearing after that point.
½½½½½
½½½
½½
½½½½
½½½½
½½½½½½
½½
½½
½½½½½½ ½½½½½½½ ½½½
½½½½½½
½½½½½½
½½
½½½½½½
Figure 3. Output Settling Characteristics
½½
½½
½½
½½
½½½½½½
½½½
½½½
½
½½
½½
½½
½½½
½½½
½½
½½
½½
½½
½½
½½
½½
½½½½½½½½½½½ ½½½½
Figure 1. Typical AD589 Temperature Characteristics
½½½½
½½
½½
½½
½½
½½
½½½½½ ½½½½½½½½ ½½½½½½½ ½½½½ ½½½
½½
½½½
Figure 4. Schematic Diagram
½½
½
½½
½½
½½
½½½
½½½½½½½½½ ½½½½
½½½½
½
Figure 2. Noise Spectral Density
–4–
REV. C
AD589
APPLICATION INFORMATION
½½
½½½½½
½½
½½½½
½½½½
½½½ ½½½
The AD589 functions as a 2-terminal shunt-type regulator. It
provides a constant 1.23 V output for a wide range of input
current from 50
A
to 5 mA. Figure 5 shows the simplest con-
figuration 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.
½½
½½½½½
½½½½½
½½½½½
½½½
½½½½
a. With 7109 12-Bit Binary ADC
½½½½½
½½
½½½½
½
½½½
½½½½½
½½
½½½ ½½
½½½ ½½
½½½½½½
Figure 5. Basic Configuration for 1.2 V or Less
½½½½½
½½½½
½½½
½½½½
The AD589 can also be used as a building block to generate
other values of reference voltage. Figure 6 shows a circuit that
produces a buffered 10 V output. Total supply current for this
circuit is approximately 2 mA.
½½½½½
½½½
½½½½
½
½
b. With 7107 Panel Meter ADC
Figure 7. AD589 Used as Reference for CMOS ADCs
½½½½½½
½
½
½
½
½
½½½
½½½
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.
½½½
½
½
½½½
½
½
½
½
½
½
½
½½½
½½
½½½
½½½½½½
½½½
½½½½½
½½½½½
½½½½
½
½½
½½
Figure 6. Single-Supply Buffered 10 V Reference
½½½
½½
½½½W
½½½½
½½
½½½
½½
½½½½½½ ½½½½½½
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 ADCs.
½½½
½
½
½½½½
½
½½½½
½½
½
½½
½½½½½½
½
½½½
½
½ ½½ ½½½½½
Figure 8. AD589 as Reference for 10-Bit CMOS DAC
REV. C
–5–
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