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AD589
2-Terminal IC
1.2 V Reference
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 Coef cient:
10 ppm/
C Max, 0
C to 70
C (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
PRODUCT DESCRIPTION
The AD589 is a 2-terminal, low cost, temperature compensated
band gap voltage reference that provides a xed 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- lm 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 speci ed 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.
PRODUCT HIGHLIGHTS
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 coef cients 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.
SOIC (R-8)
AD589
TOP VIEW
(Not to Scale)
1
2
3
–V 4
+V
8
7
6
5
Metal Can (H-02)
REV. C
–2
–
AD589–SPECIFICATIONS
(Typical @ I
IN
= 500
A and T
A
= 25
C, unless otherwise noted.)
AD589JH/
Model
AD589JR
AD589KH
AD589LH
AD589MH
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Unit
OUTPUT VOLTAGE, T
A
= 25°C
1.200
1.235
1.250
1.200
1.235
1.250
1.200
1.235
1.250
1.200
1.235
1.250
V
OUTPUT VOLTAGE CHANGE
VERSUS CURRENT
50
A to 5 mA
5
5
5
5
mV
DYNAMIC OUTPUT IMPEDANCE
0.6
2
0.6
2
0.6
2
0.6
2
RMS NOISE VOLTAGE
10 Hz < f < 10 kHz
5
5
5
5
V
TEMPERATURE COEFFICIENT
1
100
50
25
10
ppm/°C
TURN-ON SETTLING TIME TO 0.1%
25
25
25
25
s
OPERATING CURRENT
2
0.05
5
0.05
5
0.05
5
0.05
5
mA
OPERATING TEMPERATURE
0
70
0
70
0
70
0
70
°C
PACKAGE OPTION
3
Metal Can (H-02A)
AD589JH
AD589KH
AD589LH
AD589MH
SOIC (R-8)
AD589JR
Model
AD589SH
AD589TH
Min
Typ
Max
Min
Typ
Max
Unit
OUTPUT VOLTAGE, T
A
= 25°C
1.200
1.235
1.250
1.200
1.235
1.250
V
OUTPUT VOLTAGE CHANGE
VERSUS CURRENT
50
A to 5 mA
5
5
mV
DYNAMIC OUTPUT IMPEDANCE
0.6
2
0.6
2
RMS NOISE VOLTAGE
10 Hz < f < 10 kHz
5
5
V
TEMPERATURE COEFFICIENT
1
100
50
ppm/°C
TURN-ON SETTLING TIME TO 0.1%
25
25
s
OPERATING CURRENT
2
0.05
5
0.05
5
mA
OPERATING TEMPERATURE
–55
+125
–55
+125
°C
PACKAGE OPTION
3
Metal Can (H-02)
AD589SH
AD589TH
SOIC (R-8)
AD589JR
NOTES
1
See the Voltage Variation versus Temperature section for explanation of temperature coef cient 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.
Speci cations shown in
boldface
are tested on all production units at nal electrical test.
Speci cations subject to change without notice.
REV. C
AD589
–3
–
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily ac cu mu late
on the human body and test equipment and can discharge without detection. Although the AD589 features
proprietary ESD pro tec tion circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD pre cau tions are rec om mend ed to avoid per for mance
deg ra da tion or loss of functionality.
ABSOLUTE MAXIMUM RATINGS
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
TJ
T
150°C and
JA
= 400 = C/W.
AD589 CHIP DIMENSIONS AND PAD LAYOUT
ORDERING GUIDE
Temperature
No. of Parts Per
Temperature
Model
Coef cient (ppm/
C)
Package Description
Package Option
Reel/Tray
Range (
C)
AD589JH
100
Metal Can (TO-51)
H-02
100
0 to +70
AD589JR
100
SOIC-8
R-8
98
0 to +70
AD589JRZ
*
100
SOIC-8
R-8
98
0 to +70
AD589JR-REEL
100
SOIC-8
R-8
2,500
0 to +70
AD589JRZ-REEL
*
100
SOIC-8
R-8
2,500
0 to +70
AD589JCHIPS
100
DICE
—
25
0 to +70
AD589KH
50
Metal Can (TO-51)
H-02
100
0 to +70
AD589LH
25
Metal Can (TO-51)
H-02
100
0 to +70
AD589MH
10
Metal Can (TO-51)
H-02
100
0 to +70
AD589SH
100
Metal Can (TO-51)
H-02
100
–55 to +125
AD589SH/883B
100
Metal Can (TO-51)
H-02
100
–55 to +125
AD589TH
50
Metal Can (TO-51)
H-02
100
–55 to +125
AD589TH/883B
50
Metal Can (TO-51)
H-02
100
–55 to +125
AD589TCHIPS
50
DICE
—
25
–55 to +125
*
Z = Pb-free part
REV. C
AD589
–4
–
UNDERSTANDING THE SPECIFICATIONS
Voltage Variation Versus Temperature
Some confusion exists in the area of de ning 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 speci ed temperature range. The temperature coef cients
speci ed in the Speci cations section represent the slopes of the
diagonals of the error band from 25°C to T
MIN
and 25°C to T
MAX
.
�
Figure 1. Typical AD589 Temperature Characteristics
Figure 2. Noise Spectral Density
Dynamic Performance
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
gure shows both the coarse and ne 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.
�
Figure 3. Output Settling Characteristics
Figure 4. Schematic Diagram
REV. C
AD589
–5
–
APPLICATION INFORMATION
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-
guration for an output voltage of 1.2 V or less. Note that no
frequency compensation is required. If additional ltering is
desired for ultralow noise applications, minimum recommended
capacitance is 1000 pF.
�
�
Figure 5. Basic Con guration 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 that
produces a buffered 10 V output. Total supply current for this
circuit is approximately 2 mA.
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 ADCs.
�
�
�
a. With 7109 12-Bit Binary ADC
�
�
�
b. With 7107 Panel Meter ADC
Figure 7. AD589 Used as Reference for CMOS ADCs
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.
�
W
Figure 8. AD589 as Reference for 10-Bit CMOS DAC
REV. C
AD589
–6
–
OUTLINE DIMENSIONS
8-Lead Standard Small Outline Package [SOIC]
Narrow Body
(R-8)
Dimensions shown in millimeters and (inches)
0.25 (0.0098)
0.17 (0.0067)
1.27 (0.0500)
0.40 (0.0157)
0.50 (0.0196)
0.25 (0.0099) 45
8
0
1.75 (0.0688)
1.35 (0.0532)
SEATING
PLANE
0.25 (0.0098)
0.10 (0.0040)
8 5
41
5.00 (0.1968)
4.80 (0.1890)
4.00 (0.1574)
3.80 (0.1497)
1.27 (0.0500)
BSC
6.20 (0.2440)
5.80 (0.2284)
0.51 (0.0201)
0.31 (0.0122)
COPLANARITY
0.10
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
COMPLIANT TO JEDEC STANDARDS MS-012AA
2-Pin Metal Header Package [TO-51]
(H-02)
Dimensions shown in inches and (millimeters)
CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETERS DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
0.10 (2.54)
45°
0.500 (12.7)
MIN
DIA
0.195 (4.95)
0.178 (4.52)
0.048 (1.22)
0.028 (0.71)
0.046 (1.17)
0.036 (0.91)
DIA
0.230 (5.84)
0.209 (5.31)
0.150 (3.81)
0.125 (3.17)
0.019 (0.48)
0.015 (0.38)
REV. C
AD589
–7
–
Revision History
Location
Page
2/04 —Data Sheet changed from REV. B to REV. C
Changes to
FEATURES
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . .
1
Changes to
PRODUCT DESCRIPTION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . .
1
Changes to
PRODUCT HIGHLIGHTS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . .
1
Changes to
SPECIFICATIONS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . .
2
Added
ORDERING GUIDE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . .
3
Updated
OUTLINE DIMENSIONS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . .
6
REV. C
C00532–0–2/04(C)
–8
–
