AD588SQ Просмотр технического описания (PDF) - Analog Devices

Номер в каталоге

Компоненты Описание

производитель

AD588SQ

High Precision Voltage Reference

Analog Devices 

a

High Precision Voltage Reference

AD588*

FEATURES

Low Drift: 1.5 ppm/؇C

Low Initial Error: 1 mV

Pin-Programmable Output

+10 V, +5 V, ؎5 V Tracking, –5 V, –10 V

Flexible Output Force and Sense Terminals

High Impedance Ground Sense

Machine-lnsertable DIP Packaging

MIL-STD-883 Compliant Versions Available

PRODUCT DESCRIPTION

The AD588 represents a major advance in the state-of-the-art in

monolithic voltage references. Low initial error and low tem-

perature 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 out-

standing performance at low cost.

The AD588 includes the basic reference cell and three addi-

tional amplifiers which provide pin-programmable output

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 appli-

cation circuit.

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

reference in precision measurement applications requiring 12-bit

absolute accuracy. In such systems, the AD588 can provide a

known voltage for system calibration in software and the low

drift 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 autocalibration software.

The AD588 is available in seven versions. The AD588 JQ and

KQ grades are packaged in a 16-pin cerdip and are specified for

0°C to +70°C operation. AD588AQ and BQ grades are packaged

in a 16-pin cerdip and are specified for the –25°C to +85°C in-

dustrial temperature range. The ceramic AD588SQ and TQ

grades are specified for the full military/aerospace temperature

range. For military surface mount applications, the AD588SE

and TE grades are also available in 20-pin LCC packages.

*Covered by Patent Number 4,644,253.

FUNCTIONAL BLOCK DIAGRAM

NOISE

REDUCTION

7

VHIGH

6

A3 IN

4

A3 OUT

SENSE

3

RB

A1

R1

R4

R2

R5

A3

1 A3 OUT

FORCE

14 A4 OUT

SENSE

A4

15 A4 OUT

FORCE

R3

A2

R6

2

+VS

AD588

16 –VS

5

GAIN

ADJ

9

GND

SENSE

+IN

10

GND

SENSE

–IN

8

VLOW

12

BAL

ADJ

11 13

VCT A4 IN

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 thus does not increase the temperature

drift.

2. Output noise of the AD588 is very low—typically 6 µV p-p.

A pin is provided for additional noise filtering using an exter-

nal capacitor.

3. A precision ± 5 V tracking mode with Kelvin output connec-

tions is available with no external components. Tracking

error is less than one millivolt and a fine-trim is available for

applications requiring exact symmetry between the +5 V and

–5 V outputs.

4. Pin strapping capability allows configuration of a wide variety

of outputs: ± 5 V, +5 V and +10 V, –5 V & –10 V dual out-

puts or +5 V, –5 V, +10 V, –10 V single outputs.

5. Extensive temperature testing at –55°C, –25°C, 0°C, +25°C,

+50°C, +70°C, +85°C and +125°C ensures that the speci-

fied temperature coefficient is truly representative of device

performance.

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

Share Link: