ANALOG DEVICES AD581 Service Manual
High Precision
FEATURES
Laser trimmed to high accuracy
10.000 V ±5 mV (L and U models)
Trimmed temperature coefficient
5 ppm/°C maximum, 0°C to 70°C (L model)
10 ppm/°C maximum, −55°C to +125°C (U model)
Excellent long-term stability
25 ppm/1000 hrs (noncumulative)
−10 V reference capability
Low quiescent current: 1.0 mA maximum
10 mA current output capability
3-pin TO-5 package
MIL-STD-883 compliant versions available
GENERAL DESCRIPTION
The AD581 is a 3-pin, temperature compensated, monolithic,
band gap voltage reference that provides a precise 10.00 V output
from an unregulated input level ranging from 12 V to 30 V.
Laser wafer trimming (LWT) is used to trim both the initial
error at +25°C as well as the temperature coefficient, resulting
in high precision performance previously available only in expensive hybrids or oven regulated modules. The 5 mV initial error
tolerance and 5 ppm/°C guaranteed temperature coefficient of
the AD581L is available in a monolithic voltage reference.
The band gap circuit design used in the AD581 offers several
advantages over classical Zener breakdown diode techniques.
Most important, no external components are required to
achieve full accuracy and significant stability to low power
systems. In addition, total supply current to the device,
including the output buffer amplifier (which can supply up
to 10 mA) is typically 750 A. The long-term stability of the
band gap design is equivalent to selected Zener reference
diodes.
The AD581 is recommended for use as a reference for 8-, 10-
or 12-bit digital-to-analog converters (DACs) that require an
external precision reference. The device is also ideal for all types
of analog-to-digital converters (ADCs) up to 14-bit accuracy,
either successive approximation or integrating designs, and can
generally offer better performance than that provided by standard
self-contained references.
10 V IC Reference
AD581
FUNCTIONAL BLOCK DIAGRAM
+V
S
V
OUT
AD581
GND
TO-5
BOTTOM VIEW
Figure 1.
The AD581J, AD581K, and AD581L are specified for operation
from 0°C to 70°C; the AD581S, AD581T, and AD581U are
specified for the −55°C to +125°C range. All grades are
packaged in a hermetically sealed 3-pin TO-5 metal can.
PRODUCT HIGHLIGHTS
1. Laser trimming of both initial accuracy and temperature
coefficient results in very low errors over temperature
without the use of external components. The AD581L has
a maximum deviation from 10.000 V of ±7.25 mV from
0°C to 70°C, whereas the AD581U guarantees ±15 mV
maximum total error without external trims from −55°C
to +125°C.
2. Because the laser trimming is done on the wafer prior to
separation into individual chips, the AD581 is extremely
valuable to hybrid designers for its ease of use, lack of
required external trims, and inherent high performance.
3. The AD581 can also be operated in a 2-pin Zener mode to
provide a precision −10 V reference with just one external
resistor to the unregulated supply. The performance in this
mode is nearly equal to that of the standard 3-pin configuration.
4. Advanced circuit design using the band gap concept allows
the AD581 to give full performance with an unregulated
input voltage down to 13 V. With an external resistor, the
device operates with a supply as low as 11.4 V.
5. The AD581 is available in versions compliant with
MILSTD-883. Refer to the military datasheet for detailed
specifications.
08014-001
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 infrin gements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
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Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2009 Analog Devices, Inc. All rights reserved.
AD581
TABLE OF CONTENTS
Features .............................................................................................. 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Product Highlights ........................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 5
ESD Caution .................................................................................. 5
Applying the AD581 ......................................................................... 6
Voltage Variation vs. Temperature ............................................. 6
REVISION HISTORY
4/09—Rev. B to Rev. C
Updated Format .................................................................. Universal
Changes to Table 1 ............................................................................ 3
Changes to Figure 2 .......................................................................... 6
Changes to Figure 11 ........................................................................ 8
Changes to 10 V Reference with Multiplying CMOS DACs
or ADCs Section ............................................................................... 9
Changes to Precision 12-Bit DAC Reference Section .................. 9
Changes to Figure 13 ........................................................................ 9
Changes to Figure 15 and Figure 16 ............................................. 10
Updated Outline Dimensions ....................................................... 11
Changes to Ordering Guide .......................................................... 11
Output Current Characteristics ...................................................7
Dynamic Performance ..................................................................7
Precision High Current Supply ...................................................8
Connection for Reduced Primary Supply ..................................8
The AD581 as a Current Limiter .....................................................9
Negative 10 V Reference ...............................................................9
10 V Reference with Multiplying CMOS DACs or ADCs .......9
Precision 12-Bit DAC Reference .................................................9
Outline Dimensions ........................................................................ 11
Ordering Guide ........................................................................... 11
Rev. C | Page 2 of 12
AD581
SPECIFICATIONS
@ VIN = +15 V and TA = +25°C.
Specifications shown in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate
outgoing quality levels. All minimum and maximum specifications are guaranteed, although only those shown in boldface are tested on
all production units.
Table 1.
AD581J AD581K AD581L
Model
OUTPUT VOLTAGE TOLERANCE
(Error from Nominal 10,000 V Output)
±30
±10
±5
OUTPUT VOLTAGE CHANGE
Maximum Deviation from +25°C
Value, T
MIN
to T
MAX
±13.5
±6.75
±2.25
Temperature Coefficient 30 15 5 ppm/°C
LINE REGULATION
15 V ≤ VIN ≤ 30 V
3.0
3.0
3.0
(0.002) (0.002) (0.002) %/V
13 V ≤ VIN ≤ 15 V
1.0
1.0
1.0
(0.005) (0.005) (0.005) %/V
LOAD REGULATION
0 ≤ I
≤ 5 mA 200
OUT
QUIESCENT CURRENT 0.75
TURN-ON SETTLING TIME TO 0.1%
1
200 200 200 μs
500
1.0
200
0.75
500
1.0
200
0.75
500
1.0
NOISE (0.1 Hz TO 10 Hz) 40 40 40 μV (p-p)
LONG-TERM STABILITY 25 25 25 ppm/1000 hr
SHORT-CIRCUIT CURRENT 30 30 30 mA
OUTPUT CURRENT
Source @ +25°C 10 10 10 mA
Source T
Sink T
MIN
to T
MIN
to T
5 5 5 mA
MAX
5 5 5 μA
MAX
TEMPERATURE RANGE
Specified 0 70 0 70 0 70 °C
Operating −65 +150 −65 +150 −65 +150 °C
PACKAGE OPTION
2
TO-5 (H-03B) AD581JH AD581KH AD581LH
1
See Figure 7.
2
H indicates the hermetic metal can.
Units Min Typ Max Min Typ Max Min Typ Max
mV
mV
mV
mV
μV/mA
mA
Rev. C | Page 3 of 12
AD581
Table 2.
AD581S AD581T AD581U
Model
OUTPUT VOLTAGE TOLERANCE
(Error from Nominal 10,000 V Output)
±30
±10
±5
OUTPUT VOLTAGE CHANGE
Maximum Deviation from +25°C
Value, T
MIN
to T
MAX
±30
±15
±10
Temperature Coefficient 30 15 10 ppm/°C
LINE REGULATION
15 V ≤ VIN ≤ 30 V
3.0
3.0
3.0
(0.002) (0.002) (0.002) %/V
13 V ≤ VIN ≤ 15 V
1.0
1.0
1.0
(0.005) (0.005) (0.005) %/V
LOAD REGULATION
0 ≤ I
≤ 5 mA 200
OUT
QUIESCENT CURRENT 0.75
TURN-ON SETTLING TIME TO 0.1%
1
200 200 200 μs
500
1.0
200
0.75
500
1.0
200
0.75
500
1.0
NOISE (0.1 Hz TO 10 Hz) 40 40 40 μV (p-p)
LONG-TERM STABILITY 25 25 25 ppm/1000 hr
SHORT-CIRCUIT CURRENT 30 30 30 mA
OUTPUT CURRENT
Source @ +25°C 10 10 10 mA
Source T
Sink T
MIN
to T
MIN
to T
5 5 5 mA
MAX
200 200 200 μA
MAX
Sink −55°C to +85°C 5 5 5 mA
TEMPERATURE RANGE
Specified −55 +125 −55 +125 −55 +125 °C
Operating −65 +150 −65 +150 −65 +150 °C
PACKAGE OPTION
2
TO-5 (H-03B) AD581SH AD581TH AD581UH
1
See Figure 7.
2
H indicates hermetic metal can.
Units Min Typ Max Min Typ Max Min Typ Max
mV
mV
mV
mV
μV/mA
mA
Rev. C | Page 4 of 12
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