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AD2S44:  Low Cost, 14-Bit, Dual Channel Synchro/Resolver-to-Digital Converter

Product Details

The AD2S44 is a 14-bit dual channel, continuous tracking synchro/ resolver-to-digital converter. It has been designed specifically for applications where space, weight, and cost are at a premium. Each 32-lead hybrid device contains two independent Type II servo loop tracking converters. The ratiometric conversion technique employed provides excellent noise immunity and tolerance of long lead lengths.

The core of each conversion is performed by state-of-the-art mono-lithic, integrated circuits manufactured by the Analog Devices, Inc., proprietary BiMOS II process, which combines the advantages of low power CMOS digital logic with bipolar linear circuits. The use of these ICs keeps the internal component count low and ensures high reliability.

The built-in test (BIT) facility can be used in failsafe systems to provide an indication of whether the converter is tracking accurately.

Each channel incorporates a high accuracy differential condi-tioning circuit for signal inputs providing more than 74 dB of common-mode rejection. Options are available for both synchro and resolver format inputs. The converter output is via a three-state transparent latch allowing data to be read without interruption of the converter operation. The A/B and OE control lines select the channel and present the digital position to the common data outputs.

The AD2S44 also features independent reference inputs where different reference frequencies can be used for each channel.

All components are 100% tested at −55°C, +25°C, and +125°C. Devices are processed to high reliability screening standards and receive further levels of testing and screening to ensure high levels of reliability.


  • Low per-channel cost
  • 32-lead DIL hybrid package
  • 2.6 arc minute accuracy
  • 14-bit resolution
  • Built-in test
  • Independent reference inputs
  • High tracking rate

AD2S44 Functional Block Diagram


Title Content Type File Type
AD2S44: Low Cost, 14-Bit, Dual Channel Synchro/Resolver-to-Digital Converter Data Sheet (Rev B, 10/2011) (pdf, 3976 kB) Data Sheets PDF
AN-214: Ground Rules for High Speed Circuits  (pdf, 356 kB)
Layout and Wiring Are Critical in Video Converter Circuits.
Application Notes PDF
AN-264: Dynamic Characteristics of Tracking Converter  (pdf, 205 kB) Application Notes PDF
AN-263: Resolver to Digital Conversion; Simple Alternative to Optical Shaft Encoders  (pdf, 520 kB) Application Notes PDF
Single Chip DSP Motor Control Systems Catching on in Home Appliances  (pdf, 18 kB)
An article by David Krakauer of Analog Devices, reprinted from the October 2000 issue of Appliance Magazine. This article addresses how Embedded DSP motor control is revolutionizing the appliance industry, not only by delivering the highest levels of motor performance, but also by the method employed to deliver that high performance.
Technical Articles PDF
DSP Motor Control in Domestic Appliance Applications  (pdf, 161 kB)
An article by Dr. Aengus Murray of Analog Devices printed in ECN Magazine, May 2000 issue. The article addresses DSP-based motor control systems offering the control bandwidth required to make possible the development of advanced motor drive systems for domestic appliance applications.
Technical Articles PDF
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
Technology Overview Overview HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary 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.

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Price, packaging, availability

AD2S44 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD2S44-TM11B Status: Last Time Buy 32 ld BB Hybrid DIP (43.89mm) 32 Mil 1 $1,340.83 - N  Material Info PDN Purchase
AD2S44-TM12B Status: Production 32 ld BB Hybrid DIP (43.89mm) 32 Mil 1 $1,340.83 - N  Material Info Notify Me Purchase
AD2S44-TM18B Status: Production 32 ld BB Hybrid DIP (43.89mm) 32 Mil 1 $1,340.83 - N  Material Info Notify Me Purchase
AD2S44-UM18B Status: Production 32 ld BB Hybrid DIP (43.89mm) 32 Mil 1 $1,614.01 - N  Material Info Notify Me 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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