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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, 0 C to +70 C (AD589M)
25 ppm/ C max, –55 C to +125 C (AD589U)
Two-Terminal “Zener” Operation
Low Output Impedance: 0.6
No Frequency Compensation Required
Low Cost
MIL-STD-883 Compliant Versions Available
SOIC (SO-8)
1
2
3
–V
4
8
7
6
5
+V
Two-Terminal IC
1.2 V Reference
AD589
FUNCTIONAL BLOCK DIAGRAMS
Metal Can (H-02A)
+V
AD589
TOP VIEW
–V
BOTTOM VIEW
PRODUCT DESCRIPTION
The AD589 is a two-terminal, low cost, temperature compen-
sated bandgap voltage reference which provides a fixed 1.23 V
output voltage for input currents between 50
µA
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
technology combine to provide excellent performance at low
cost.
Additionally, the active circuit produces an output impedance
ten times lower than 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, K, L
and M grades are specified for 0°C to +70°C operation, while
the S, T, and U grades are rated for the full –55°C to +125°C
temperature range. All grades are available in a metal can
(H-02A) package. The AD589J is also available in an 8-pin
SOIC package.
PRODUCT HIGHLIGHTS
1. The AD589 is a two-terminal device which delivers a
constant reference voltage for a wide range of input
current.
2. Output impedance of 0.6
Ω
and temperature coefficients as
low as 10 ppm/°C insure stable output voltage over a wide
range of operating conditions.
3. The AD589 can be operated as a positive or negative
reference. “Floating” operation is also possible.
4. The AD589 will operate with total current as low as 50
µA
(60
µW
total power dissipation), ideal for battery powered
instrument applications.
5. The AD589 is an exact replacement for other 1.2 V ref-
erences, offering superior temperature performance and
reduced sensitivity to capacitive loading.
6. The AD589 is available in versions compliant with MIL-
STD-883. Refer to the Analog Devices Military Products
Databook or current AD589/883B data sheet for detailed
specifications.
REV. B
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
AD589–SPECIFICATIONS
(typical @ I
Model
Min
OUTPUT VOLTAGE, T
A
= +25°C
OUTPUT VOLTAGE CHANGE vs.
CURRENT
(50
µA–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)
Model
0.05
0
AD589JH
AD589JR
AD589SH
Min
Typ
Max
1.200
1.235
1.250
25
5
+70
0.6
5
100
AD589JH/JR
Typ
Max
1.235
1.250
1.200
IN
= 500 A and T
A
= +25 C unless otherwise noted)
AD589KH
Typ
Max
1.235
1.250
Min
AD589LH
Typ Max
1.235
1.250
Min
AD589MH
Typ Max
1.235
1.250
Unit
V
Min
1.200
1.200
1.200
5
2
0.6
5
5
2
0.6
5
50
25
0.05
0
5
+70
AD589KH
0.05
0
AD589LH
25
5
2
0.6
5
25
25
5
+70
0.05
0
5
2
mV
Ω
µV
10
ppm/°C
µs
5
+70
AD589MH
mA
°C
AD589TH
Min
Typ
Max
1.200
1.235
1.250
AD589UH
Min
Typ Max
1.200
1.235
1.250
Unit
V
OUTPUT VOLTAGE, T
A
= +25°C
OUTPUT VOLTAGE CHANGE vs.
CURRENT
(50
µA–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 (SO-8)
5
0.6
5
100
25
0.05
–55
AD589SH
AD589JR
5
+125
0.05
–55
25
2
0.6
5
5
2
0.6
5
50
25
5
+125
AD589TH
0.05
–25
AD589UH
5
2
mV
Ω
µV
25
ppm/°C
µs
5
+125
mA
°C
NOTES
1
See the following page for explanation of temperature coefficient measurement method.
2
Optimum performance is obtained at currents below 500
µA.
For current operation below 200
µA,
stray shunt capacitances should be limited
to 20 pF or increased to 1µF. If strays can not be avoided, operation at 500
µA
and a shunt capacitor of at least 1000 pF are recommended.
3
H = Hermetic Metal Can; SO = SOIC.
Specifications shown in
boldface
are tested on all production units at final electrical test.
Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS
AD589 CHIP DIMENSIONS AND PAD LAYOUT
Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mA
Reverse Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mA
Power Dissipation
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . 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
NOTE
1
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
θ
JA
= 400 = C/W.
0.040
(1.016)
0.060
(1.524)
THE AD589 IS AVAILABLE IN CHIP FORM WITH FULLY TESTED
AND GUARANTEED SPECIFICATIONS. CONSULT FACTORY FOR
AVAILABLE GRADES AND PRICING.
–2–
REV. B
Understanding the Specifications–AD589
VOLTAGE VARIATION VS. 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 measure-
ment 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 consis-
tently follows the curve shown in Figure 1. Three-point
measurement guarantees the error band over the specified
temperature range. The temperature coefficients specified on
the previous page represent the slopes of the diagonals of the
error band from +25°C to T
MIN
and +25°C to T
MAX
.
1.2370
Many low power instrument manufacturers are becoming
increasingly concerned with the turn-on characteristics of the
components being used in their systems. Fast turn-on compo-
nents 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 displays the turn-on characteristics of the
AD589. This characteristic is generated from cold-start opera-
tion 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 millivolt is about 25
µs,
and there is no long
thermal tail appearing after that point.
200mV
100
90
10mV
10µs
1.2365
OUTPUT VOLTAGE – V
10
0%
1.2360
1.2355
+V
Figure 3. Output Settling Characteristics
1.2350
R1
Q5
R5
R6
1.2345
–50
–25
0
+25
+50
+75
+100
+125
Q8
R2
R7
Q3
R3
Q4
C1
Q9
TEMPERATURE – °C
Figure 1. Typical AD589 Temperature Characteristics
1000
Q1
R4
Q7
Q2
Hz
–V
NOISE SPECTRAL DENSITY – nV/
100
Figure 4. Schematic Diagram
10
0
10
100
1k
10k
FREQUENCY – Hz
100k
1M
Figure 2. Noise Spectral Density
REV.B
–3–
AD589
APPLICATION INFORMATION
+5V
6.2kΩ
+V
COMMON
+5V
6.8kΩ
b. With 7107 Panel Meter A/D
Figure 7. AD589 Used as Reference for CMOS
A/D Converters
AD589
10kΩ
V
OUT
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
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.
BIT
1
MSB
V
DD
BIT
10
LSB
2
3
4
5
6
7
8
9
AD589
+15V
15kΩ
7
2
6
AD108A
3
4
0.01µF
1kΩ
8
1
1kΩ
10V
+15V
REF
14
15
R1
39kΩ
–15V
R2
5kΩ
GND
3
2
OUT2
AD7533 SERIES
1
OUT1
16
R
FB
V
OUT
=
0 TO 1.00V
AD542L
8.2kΩ
Figure 8. AD589 as Reference for 10-Bit CMOS DAC
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.
+5V
5.6kΩ
+V
OUTLINE DIMENSIONS AND PIN DESIGNATIONS
Dimensions shown in inches and (mm).
0.209 (5.31)
DIA
0.230 (5.84)
0.10 (2.54)
0.195 (4.95)
DIA
0.178 (4.52)
0.150 (3.81)
0.125 (3.17)
6.8kΩ
AD589
7109
REF+
REF–
REF OUT
45°
2kΩ
0.028 (0.71)
0.048 (1.22)
0.015 (0.38)
0.019 (0.48)
0.500 (12.7)
MIN
0.036 (0.91)
0.046 (1.17)
a. With 7109 12-Bit Binary A/D
–4–
REV. B
PRINTED IN U.S.A.
C547c–2–7/88
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.
10kΩ
AD589
7107
REF HI
REF LO
1kΩ
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