AD688SQ AD [Analog Devices], AD688SQ Datasheet

AD688SQ

Manufacturer Part Number

AD688SQ

Description

High Precision -+10 V Reference

Manufacturer

AD [Analog Devices]

Datasheet

1.AD688SQ.pdf (8 pages)

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PRODUCT DESCRIPTION

The AD688 is a high precision 10 V tracking reference. Low

tracking error, low initial error and low temperature drift give

the AD688 reference absolute 10 V accuracy performance

previously unavailable in monolithic form. The AD688 uses a

proprietary ion-implanted buried Zener diode, and laser-wafer-

drift-trimming of high stability thin-film resistors to provide

outstanding performance at low cost.

The AD688 includes the basic reference cell and three additional

amplifiers. The amplifiers are laser-trimmed for low offset and

low drift and 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 AD688 where it is required in

the application circuit.

The low initial error allows the AD688 to be used as a system

reference in precision measurement applications requiring

12-bit absolute accuracy. In such systems, the AD688 can

provide a known voltage for 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 AD688 and calibration software.

The AD688 is available in three versions. The AD688AQ and

BQ grades are packaged in 16-pin cerdip (0.3") packages and

are specified for operation from –40 C to +85 C. The AD688SQ

grade is specified for operation from –55 C to +125 C.

*Covered by Patent Number 4,644,253.

REV. A

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.

FEATURES

Kelvin Connections

Low Tracking Error – 1.5 mV

Low Initial Error – 2.0 mV

Low Drift – 1.5 ppm/ C

Low Noise – 6 V p-p

Flexible Output Force and Sense Terminals

High Impedance Ground Sense

Machine Insertable DIP Packaging

MIL-STD-883 Compliant Versions Available

10 V Tracking Outputs

PRODUCT HIGHLIGHTS

1. The AD688 offers precision tracking 10 V Kelvin output

2. The AD688 offers 12-bit absolute accuracy without any user

3. Output noise of the AD688 is low – typically 6 V p-p. A pin

4. The AD688 is available in versions compliant with MIL-

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

connections with no external components. Tracking error is

less than 1.5 mV and a fine-trim is available for applications

requiring exact symmetry between the +10 V and –10 V

outputs.

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.

is provided for broadband noise filtering using an external

capacitor.

STD-883. Refer to the Analog Devices Military Products

Databook or current AD688/883B data sheet for detailed

specifications.

FUNCTIONAL BLOCK DIAGRAM

10 V Reference

High Precision

AD688*

Fax: 617/326-8703

Related parts for AD688SQ

AD688SQ Summary of contents

Page 1

... AD688 and calibration software. The AD688 is available in three versions. The AD688AQ and BQ grades are packaged in 16-pin cerdip (0.3") packages and are specified for operation from – +85 C. The AD688SQ grade is specified for operation from – +125 C. *Covered by Patent Number 4,644,253. ...

Page 2

AD688–SPECIFICATIONS OUTPUT VOLTAGE ERROR +10 V, –10 V Outputs 10 V TRACKING ERROR OUTPUT VOLTAGE DRIFT +10 V, –10 V Outputs +70 C (A, B) – +85 C (A, B) – +125 C ...

Page 3

... Part Number AD688AQ AD688BQ AD688SQ NOTES 1 For details on grade and package offerings screened in accordance with MIL-STD-883, refer to the Analog Devices Military Products Databook or current AD688/883B data sheet Cerdip. *Temperature coefficient specified from 0 to +70 C. THEORY OF OPERATION The AD688 consists of a buried Zener diode reference, amplifi- ers and associated thin-film resistors as shown in the block diagram of Figure 1 ...

Page 4

AD688 APPLYING THE AD688 The AD688 can be configured to provide 10 V reference out- puts as shown in Figure 2a. The architecture of the AD688 pro- vides ground sense and uncommitted output buffer amplifiers which offer the user a ...

Page 5

... Figure 7 shows the typical output voltage drift for the AD688SQ and illustrates the test methodology. The box in Fig- ure 7 is bounded on the sides by the operating temperature extremes and on top and bottom by the maximum and minimum +10 V output error voltages measured over the operating temperature range ...

Page 6

AD688 Duplication of these results requires a combination of high accuracy and stable temperature control in a test system. Evaluation of the AD688 will produce curves similar to those in Figure 7, but output readings may vary depending on the ...

Page 7

Figure 10b. Large-Scale Transient Response Figure 10c. Fine-Scale Settling for Transient Load Figure 11 displays the output amplifier characteristic driving a 5 mA-to-10 mA load, a common situation found when the reference is shared among multiple converters or is used ...

Page 8

AD688 Attempts to drive a large capacitive load (in excess of 1,000 pF) may result in ringing or oscillation, as shown in the step re- sponse photo (Figure 14a). This is due to the additional pole formed by the load ...

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