ANALOG DEVICES AD588 Service Manual

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High Precision Voltage Reference

FEATURES

Low drift: 1.5 ppm/°C
Low initial error: 1 mV
Pin programmable output
+10 V, +5 V, ±5 V tracking, −5 V

Flexible output force and sense terminals
High impedance ground sense
SOIC_W-16 and CERDIP-16 packages
MIL-STD-883-compliant versions available

GENERAL DESCRIPTION

The AD5881 represents a major advance in state-of-the-art
monolithic voltage references. Low initial error and low
temperature drift give the AD588 absolute accuracy performance
previously not available in monolithic form. The AD588 uses a
proprietary ion-implanted, buried Zener diode and laser-wafer
drift trimming of high stability thin film resistors to provide
outstanding performance.

The AD588 includes the basic reference cell and three

dditional amplifiers that provide pin programmable output

a
ranges. The amplifiers are laser trimmed for low offset and low
drift to maintain the accuracy of the reference. The amplifiers
are configured to allow Kelvin connections to the load and/or
boosters for driving long lines or high current loads, delivering
the full accuracy of the AD588 where it is required in the
application circuit.

The low initial error allows the AD588 to be used as a system
r

eference in precision measurement applications requiring
12-bit absolute accuracy. In such systems, the AD588 can provide
a known voltage for system calibration in software. The low
drift also allows compensation for the drift of other components
in a system. Manual system calibration and the cost of periodic
recalibration can, therefore, be eliminated. Furthermore, the
mechanical instability of a trimming potentiometer and the
potential for improper calibration can be eliminated by using
the AD588 in conjunction with auto calibration software.

The AD588 is available in 16-lead SOIC and CERDIP packages.
The AD588
CERDIP and are specified for 0°C to 70°C operation.

1

Protected by Patent Number 4,644,253.

JQ and AD588KQ grades are packaged in a 16-lead

, −10 V

Microcomputer

AD588

FUNCTIONAL BLOCK DIAGRAM

A3 IN

BAL
ADJ

A3 OUT

SENSE

3467

A3

A4

R6

AD588

13111281095

V

A4 IN

CT

1

14

15

2

16

A3 OUT
FORCE

A4 OUT
SENSE

A4 OUT
FORCE

+V

–V

GAIN

ADJ

R3

NOISE

REDUCTION

R

B

R2

A2

GND

SENSE

+IN

A1

R1

GND

SENSE

–IN

V

V

HIGH

R4

R5

LOW

Figure 1.

PRODUCT HIGHLIGHTS

1. The AD588 offers 12-bit absolute accuracy without any

user adjustments. Optional fine-trim connections are
provided for applications requiring higher precision. The
fine trimming does not alter the operating conditions of
the Zener or the buffer amplifiers, and so does not increase
the temperature drift.

2. O

utput noise of the AD588 is very low, typically 6 μV p-p.
A pin is provided for additional noise filtering using an
external capacitor.

3. A p

4. Pin st

recision ±5 V tracking mode with Kelvin output
connections is available with no external components.
Tracking error is less than 1 mV, and a fine trim is available
for applications requiring exact symmetry between the
+5 V and −5 V outputs.

rapping capability allows configuration of a wide
variety of outputs: ±5 V, +5 V, +10 V, −5 V, and −10 V dual
ou tp ut s or +5 V, − 5 V, +1 0 V, an d − 10 V si ng le ou tput s.

S

S

00531-001

Rev. G

Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] ©2006 Analog Devices, Inc. All rights reserved.

AD588

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TABLE OF CONTENTS

Features.............................................................................................. 1

Temperature Performance......................................................... 10

General Description......................................................................... 1

Functional Block Diagram ..............................................................1

Product Highlights........................................................................... 1

Revision History ...............................................................................2

Specifications..................................................................................... 3

Absolute Maximum Ratings............................................................ 4

ESD Caution.................................................................................. 4

Pin Configuration and Function Descriptions............................. 5

Theory of Operation ........................................................................ 6

Applications....................................................................................... 7

Calibration..................................................................................... 7

Noise Performance and Reduction ............................................9

Turn-On Time ............................................................................ 10

REVISION HISTORY

Kelvin Connections.................................................................... 11

Dynamic Performance............................................................... 13

Using the AD588 with Converters............................................... 15

AD7535 14-Bit Digital-to-Analog Converter......................... 15

AD569 16-Bit Digital-to-Analog Converter........................... 15

Substituting for Internal References ........................................ 16

AD574A 12-Bit Analog-to-Digital Converter........................ 16

Resistance Temperature Detector (RTD) Excitation............. 16

Boosted Precision Current Source........................................... 17

Bridge Driver Circuits ............................................................... 17

Outline Dimensions....................................................................... 19

Ordering Guide .......................................................................... 19

6/06—Rev. F to Rev. G

Changes to Table 5............................................................................ 7

Updated Outline Dimensions....................................................... 19

3/06—Rev. E to Rev. F

aced Figure 5 ............................................................................. 8

Repl

Updated Outline Dimensions....................................................... 19

11/05—Rev. D to Rev. E

pdated Format..................................................................Universal

U

Added SOIC Version..........................................................Universal

Changes to Pin 14 in Figures.............................................Universal

Changes to Pin 9 and Pin 10 in Figures...........................Universal

Changes to Specifications Section.................................................. 3

Added Table 3.................................................................................... 4

Added Pin Configuration and Function Descriptions Section.. 5

Added Table 4.................................................................................... 5

Changes to Grade in Reference and in Figure 12....................... 11

Updated Outline Dimensions....................................................... 19

Changes to Ordering Guide.......................................................... 19

2/03—Rev. C to Rev. D

A

dded KQ Model and Deleted SQ and TQ Models ......Universal

Changes to General Description .....................................................1

Change to Product Highlights.........................................................1

Changes to Specifications.................................................................2

Change to Ordering Guide...............................................................3

Updated Outline Dimensions....................................................... 15

10/02—Rev. B to Rev. C

hanges to General Description .....................................................1

C

Changes to Specifications.................................................................2

Changes to Ordering Guide.............................................................3

Changes to Table 1.............................................................................5

Deleted Figure 10c.............................................................................7

Outline Dimensions Updated....................................................... 15

Rev. G | Page 2 of 20

AD588

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SPECIFICATIONS

Typical @ 25°C, 10 V output, VS = ±15 V, unless otherwise noted.

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.

AD588JQ/AQ AD588BQ/KQ AD588ARWZ

Parameter

OUTPUT VOLTAGE ERROR

+10 V, −10 V Outputs
+5 V, −5 V Outputs

±5 V TRACKING MODE

Symmetry Error

OUTPUT VOLTAGE DRIFT

0°C to 70°C (J, K, B) ±2

−25°C to +85°C (A, B)

GAIN ADJ AND BAL ADJ2

Trim Range ±4
Input Resistance 150

LINE REGULATION

T

LOAD REGULATION

T

SUPPLY CURRENT

T
Power Dissipation 180

1

3

to T

MIN

MAX

to T

MIN

MAX

+10 V Output, 0 mA < I

−10 V Output, −10 mA < I

to T

MIN

6

MAX

Min Typ Max Min Typ Max Min Typ Max Unit

< 10 mA

OUT

< 0 mA

OUT

±3 −1 +1 −5 +5

±3 −1 +1 −5 +5

±1.5 ±0.75

±3
±3

±200

±4
150

±1.5
±3

±200

±50 ±50
±50 ±50

10
300

6
180

10
300

±2

±4

±1.5

±3
±3

150 kΩ

6
180

±200

±50
±50

10
300

mV
mV

mV

ppm/°C
ppm/°C

mV

μV/V

μV/mA
μV/mA

mA
mW

OUTPUT NOISE (Any Output)

0.1 Hz to 10 Hz 6 6 6 μV p-p

Spectral Density, 100 Hz 100 100 100 nV/√Hz
LONG-TERM STABILITY (@ 25°C) 15 15 15 ppm/1000 hr
BUFFER AMPLIFIERS

Offset Voltage 100 10 100 μV

Offset Voltage Drift 1 1 1 μV/°C

Bias Current 20 20 20 nA

Open-Loop Gain 110 110 110 dB

Output Current (A3, A4) −10 +10 −10 +10 −10 +10 mA

Common-Mode Rejection (A3, A4)

VCM = 1 V p-p 100 100 100 dB

Short Circuit Current 50 50 50 mA
TEMPERATURE RANGE

Specified Performance

J, K Grades 0 70 0 70 °C
A, B Grades −25 +85 −25 +85 −25 +85 °C

1

Specifications tested using ±5 V configuration, unless otherwise indicated. See Figure 4 through Figure 6 for output configurations at +10 V, −10 V, +5 V, −5 V

and ±5 V.

2

Gain and balance adjustments guaranteed capable of trimming output voltage error and symmetry error to zero.

3

For ±10 V output, ±VS can be as low as ±12 V. See Table 3 for test conditions at various voltages.

Rev. G | Page 3 of 20

AD588

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ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter Rating

+VS to −VS 36 V
Power Dissipation (25°C) 600 mW
Storage Temperature Range −65°C to +150°C
Lead Temperature (Soldering 10 sec) 300°C
Package Thermal Resistance (θ
Output Protection

Table 3. Test Conditions

Voltage Conditions

+10 V Output −VS = –15 V, +13.5 V ≤ +VS ≤ +18 V

−18 V ≤ –VS ≤ –13.5 V, +VS = +15 V −10 V Output
±5 V Output +VS = +18 V, –VS = –18 V
+V

= +10.8 V, −VS = −10.8 V

S

) 90°C/25°C/W

JA/θJC

All outputs safe if
shor

ted to ground

ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product 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.

Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.

Rev. G | Page 4 of 20

AD588

A

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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

3 OUT FORCE

+V

A3 OUT SENSE

A3 IN

GAIN ADJ

V

HIGH

NOISE

REDUCTION

V

LOW

1

2

S

3

4

5

6

7

8

AD588

TOP VIEW

(Not to Scale)

16

–V

S

15

A4 OUT F ORCE

14

A4 OUT SENSE

13

A4 IN

12

BAL ADJ

11

V

CT

10

GND SENSE –IN

9

GND SENSE +IN

00531-002

Figure 2. Pin Configuration

Table 4. Pin Function Descriptions

Pin No. Mnemonic Description

1 A3 OUT FORCE Output from Buffering Amplifier 3 with Kelvin Force. Connect to Pin 3.
2 +VS Positive Power Supply.
3 A3 OUT SENSE
4 A3 IN
5 GAIN ADJ
6 V

Unbuffered Reference High Output.

HIGH

7 NOISE REDUCTION

Output from Buffering Amplifier 3 with Kelvin Sense. Connect to Pin 1.
+ Input to Amplifier 3. Connect to V

HIGH

, Pin 6.

Reference Gain Adjustment for Calibration. See the Calibration section.

Noise Filtering Pin. Connect external 1 μF capacitor to ground to reduce the output noise

(see the Noise Performance and Reduction section). Can be left open.
8 V
9 GND SENSE POSITIVE IN
10 GND SENSE NEGATIVE IN
11 V
12 BAL ADJ
13 A4 IN
14 A4 OUT SENSE
15 A4 OUT FORCE
16 −V

Unbuffered Reference Low Output.

LOW

+ Input to the Ground Sense Amplifier.

− Input to the Ground Sense Amplifier.

Center Tap Voltage used for Calibration. See the Calibration section.

CT

Reference Centering Adjustment for Calibration. See the Calibration section.

+ Input to Amplifier 4. Connect to V

LOW

, Pin 8.
Output of Buffering Amplifier 4 with Kelvin Sense. Connect to Pin 15.
Output of Buffering Amplifier 4 with Kelvin Force. Connect to Pin 14.

Negative Power Supply.

S

Rev. G | Page 5 of 20

AD588

A

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THEORY OF OPERATION

The AD588 consists of a buried Zener diode reference,

mplifiers used to provide pin programmable output ranges,

a
and associated thin-film resistors, as shown in Figure 3. The
t

emperature compensation circuitry provides the device with

a temperature coefficient of 1.5 ppm/°C or less.

Amplifier A1 performs several functions. A1 primarily acts to
a

mplify the Zener voltage from 6.5 V to the required 10 V
output. In addition, A1 provides for external adjustment of the
10 V output through Pin 5, GAIN ADJ. Using the bias
compensation resistor between the Zener output and the
noninverting input to A1, a capacitor can be added at the
NOISE REDUCTION pin (Pin 7) to form a low-pass filter and
reduce the noise contribution of the Zener to the circuit. Two
matched 10 kΩ nominal thin-film resistors (R4 and R5) divide
the 10 V output in half. Pin V

(Pin 11) provides access to the

CT

center of the voltage span and BAL ADJ (Pin 12) can be used
for fine adjustment of this division.

NOISE

REDUCTION

V

HIGH

Ground sensing for the circuit is provided by Amplifier A2. The
noninverting input (Pin 9) senses the system ground, which is
transferred to the point on the circuit where the inverting input
(Pin 10) is connected. This can be Pin 6, Pin 8, or Pin 11. The
output of A2 drives Pin 8 to the appropriate voltage. Thus, if
Pin 10 is connected to Pin 8, the V

pin is the same voltage as

LOW

the system ground. Alternatively, if Pin 10 is connected to the
V

pin, it is a ground; and Pin 6 and Pin 8 are +5 V and −5 V,

CT

respectively.

Amplifier A3 and Amplifier A4 are internally compensated and
a

re used to buffer the voltages at Pin 6, Pin 8, and Pin 11, as well
as to provide a full Kelvin output. Thus, the AD588 has a full
Kelvin capability by providing the means to sense a system
ground and provide forced and sensed outputs referenced to
that ground.

Note that both positive and negative supplies are required for
o

peration of the AD588.

3 OUT

A3 IN

SENSE

3467

1

14

15

2

16

A3 OUT
FORCE

A4 OUT
SENSE

A4 OUT
FORCE

+V

S

–V

S

00531-003

GAIN

ADJ

R

B

A1

R1

R2

R3

A2

GND

GND

SENSE

SENSE

+IN

–IN

Figure 3. AD588 Functional Block Diagram

R4

R5

R6

BAL
ADJ

V

CT

V

LOW

A3

A4

AD588

13111281095

A4 IN

Rev. G | Page 6 of 20