Datasheet AD589UH, AD589TH, AD589SH, AD589MH, AD589LH Datasheet (Analog Devices)

Two-Terminal IC

a

FEATURES
Superior Replacement for Other 1.2 V References
Wide Operating Range: 50 mA to 5 mA
Low Power: 60 mW Total P
Low Temperature Coefficient:

10 ppm/8C max, 08C to +708C (AD589M)

25 ppm/8C max, –558C to +1258C (AD589U)
Two-Terminal “Zener” Operation
Low Output Impedance: 0.6 V
No Frequency Compensation Required
Low Cost
MIL-STD-883 Compliant Versions Available

PRODUCT DESCRIPTION

The AD589 is a two-terminal, low cost, temperature compen­sated 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.

at 50 mA

D

1.2 V Reference
AD589

FUNCTIONAL BLOCK DIAGRAMS

SOIC (SO-8) Metal Can (H-02A)

1

2

3
4

–V

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 ref­erences, offering superior temperature performance and
reduced sensitivity to capacitive loading.

6. The AD589 is available in versions compliant with MIL­STD-883. Refer to the Analog Devices Military Products
Databook or current AD589/883B data sheet for detailed
specifications.

AD589

TOP VIEW

8

+V

7

6
5

+V

–V

BOTTOM VIEW

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: [phone] Fax: [phone]

AD589–SPECIFICA TIONS

(typical @ IIN = 500 mA and TA = +258C unless otherwise noted)

Model AD589JH/JR AD589KH AD589LH AD589MH

Min Typ Max Min Typ Max Min Typ Max Min Typ Max Unit

OUTPUT VOLTAGE, TA = +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 vs.

CURRENT

(50 µA–5 mA) 5 5 5 5 mV
DYNAMIC OUTPUT IMPEDANCE 0.6 2 0.6 2 0.6 2 0.6 2 Ω
RMS NOISE VOLTAGE

10 Hz < f < 10 kHz 5 5 5 5 µV

TEMPERATURE COEFFICIENT

1

100 50 25 10 ppm/°C
TURN-ON SETTLING TIME TO 0.1% 25 25 25 25 µs
OPERATING CURRENT

2

0.05 5 0.05 5 0.05 5 0.05 5mA
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 AD589UH

Min Typ Max Min Typ Max Min Typ Max Unit

OUTPUT VOLTAGE, TA = +25°C 1.200 1.235 1.250 1.200 1.235 1.250 1.200 1.235 1.250 V
OUTPUT VOLTAGE CHANGE vs.

CURRENT

(50 µA–5 mA) 5 5 5 mV
DYNAMIC OUTPUT IMPEDANCE 0.6 2 0.6 2 0.6 2 Ω
RMS NOISE VOLTAGE

10 Hz < f < 10 kHz 5 5 5 µV

TEMPERATURE COEFFICIENT

1

100 50 25 ppm/°C
TURN-ON SETTLING TIME TO 0.1% 25 25 25 µs
OPERATING CURRENT

2

0.05 5 0.05 5 0.05 5mA
OPERATING TEMPERATURE –55 +125 –55 +125 –25 +125 °C
PACKAGE OPTION

3

Metal Can (H-02A) AD589SH AD589TH AD589UH
SOIC (SO-8) AD589JR

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
TJ≤ 150°C, and θJA = 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

R1 R5 R6

R2

R7 C1

Q2

R4

Q1

R3

Q3 Q4

–V

+V

Q5

Q8

Q7

Q9

VOLTAGE VARIATION VS. TEMPERATURE

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 on
the previous page represent the slopes of the diagonals of the
error band from +25°C to T

1.2370

1.2365

1.2360

1.2355

OUTPUT VOLTAGE – V

1.2350

and +25°C to T

MIN

MAX

.

DYNAMIC PERFORMANCE

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 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 displays 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 millivolt is about 25 µs, and there is no long
thermal tail appearing after that point.

200mV

100
90

10

0%

10mV

10µs

Figure 3. Output Settling Characteristics

1.2345
–50

–25

TEMPERATURE – °C

+125

+100+75+50+250

Figure 1. Typical AD589 Temperature Characteristics

1000

100

10

NOISE SPECTRAL DENSITY – nV/ Hz

0

10 100 1M100k10k1k

FREQUENCY – Hz

Figure 2. Noise Spectral Density

Figure 4. Schematic Diagram

REV.B

–3–

AD589

AD589

6.2kΩ

10kΩ

1kΩ

+5V

+V

7107

REF HI
REF LO
COMMON

AD589

2 1 16

R

FB

OUT1OUT2

REF

GND

V

DD

+15V

R2

5kΩ

14

15

3

R1

39kΩ

–15V

V

OUT

=

0 TO 1.00V

MSB LSB

23456789

BIT

1

BIT

10

AD7533 SERIES

AD542L

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.

+5V

6.8kΩ

AD589

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

10kΩ

V

OUT

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.

C547c–2–7/88

+15V

15kΩ

2

3

7

AD108A

4

1

0.01µF

6

8

1kΩ

1kΩ

8.2kΩ

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.

+5V

5.6kΩ

+V

REF+
REF–
REF OUT

7109

AD589

a. With 7109 12-Bit Binary A/D

6.8kΩ

2kΩ

–4–

Figure 8. AD589 as Reference for 10-Bit CMOS DAC

OUTLINE DIMENSIONS AND PIN DESIGNATIONS

Dimensions shown in inches and (mm).

45°

0.036 (0.91)

0.046 (1.17)

0.10 (2.54)

0.195 (4.95)

0.178 (4.52)

0.028 (0.71)

0.048 (1.22)

DIA

0.015 (0.38)

0.019 (0.48)

0.209 (5.31)

0.230 (5.84)

0.500 (12.7)
MIN

DIA

0.150 (3.81)

0.125 (3.17)

REV. B

PRINTED IN U.S.A.