Discontinued as of July 27, 2012. Please refer to SDC-630/632/634-A/ST.


Part Number(s):SDC-630, SDC-632, SDC-634
Package: Module (2.6 x 3.1 x 0.4 inches)
Lead Free Information: B

The SDC-630/632/634 series are low cost, low profile Synchro-to-Digital (S/D) and Resolver-to-Digital (R/D) tracking converters with standard pin configurations. They use a unique control transformer algorithm that provides inherently higher accuracy and jitter-free output. Utilizing a type II servo loop, these converters have no velocity lag up to the specified tracking rate, and output data is always fresh and ontinuously available. Each unit is fully trimmed and requires no adjustment or field calibration.


These converters may be used wherever analog angle data from a synchro or resolver must be rapidly and accurately converted to digital form for transmission, storage or analysis. Because these units are extremely rugged and stable, and meet the requirements on MIL-STD-202E, they are suitable for the most severe industrial, commercial and military applications. Military ground support and avionics uses include ordnance control, radar tracking systems, navigation and collision avoidance systems.


  • Standard Low Profile Converters with Optional Velocity Output
  • Signal and Reference Input:
    • Internal Transformer Isolation
    • All Common L-L Levels and Frequencies
  • Accuracy:
    • 10 Bit: 21 Minutes
    • 12 Bit: 8.5 Minutes
    • 14 Bit: 4 Minutes, 0.9 LSB or 2.6 Minutes (High Accuracy)
  • Logic:
    • TTL Compatible
    • Parallel Binary Angle Output
  • Power Required:
    • ±15 VDC and +5 VDC




10, 12, 14 Bit S/D or D/S Converter

 Application Note

MFT-1: Testing and Troubleshooting Synchro/Resolver Converters

MFT-8 Building a Low Cost Reference Oscillator for Resolver-to-Digital Converters

 Generic Document

DDC Corporate Overview

DDC Product Catalog

Synchro/Resolver Conversion Handbook

DDC Custom Solutions Brochure


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