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AD688:  High Precision ±10 V Reference

Product Details

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.


  • ±10 V tracking outputs
  • Kelvin connections
  • Low tracking error: 1.5 mV
  • Low initial error: 2.0 mV
  • Low drift: 1.5 ppm/°C
  • Low noise: 6 µV p-p
  • Flexible output force and sense terminals
  • High impedance ground sense
  • Wide body SOIC and CERDIP packages

Functional Block Diagram for AD688


Title Content Type File Type
AD688: Military Data Sheet  (Rev A, 01/2002) (pdf) Data Sheets PDF
AD688: High Precision ±10 V Reference Data Sheet (Rev B, 03/2005) (pdf, 621 kB) Data Sheets PDF
AN-713: The Effect of Long-Term Drift on Voltage References  (pdf, 237 kB) Application Notes PDF
ADI Warns Against Misuse of COTS Integrated Circuits  (pdf, 13 kB)
(Revised 1/03)
Invites Customer Participation in Creative Mil/Aero System Solutions
Recommended Reading PDF
Ask The Applications Engineer-11
Voltage References

(Analog Dialogue, 30th Anniversary Reader Bonus)
Analog Dialogue HTML
Space Qualified Parts List  (pdf, 93 kB)
This document lists 67 (240+) space level products that are available from Analog Devices. Many of the products listed are state-of-the-art data conversion and signal processing products that were previously only available as commercial or military Class B products. Through our Space Products Group and MIL-PRF-38535 certified Level V (Class S) facility, we are pleased to offer these products to the space marketplace.
Aerospace Information PDF
What do I need to know about selecting and using Voltage References? FAQs/RAQs HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
Voltage Reference Selection & Evaluation Wizard Design Calculators HTML

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

SampleSample & Buy

Price, packaging, availability

AD688 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
5962-9321401MEA Status: Production 16 ld CerDIP 16 Mil Tube, 25 $58.77 $53.11 N  Material Info PCN Purchase
AD688AQ Status: Production 16 ld CerDIP 16 Ind Tube, 25 $22.11 $19.99 N  Material Info PCN Purchase
AD688ARWZ Status: Production 16 ld SOIC - Wide 16 Ind Tube, 47 $16.67 $13.40 Y  Material Info PCN Purchase
AD688BQ Status: Production 16 ld CerDIP 16 Ind Tube, 25 $35.06 $31.70 N  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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