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The SM3470B is an interpolation IC for optical encoders. It accepts displacement detection, 2-phase analog signals (A and B phases) and a zero point detection analog signal (Z phase) from an encoder, interpolates the signals by a specified interpolation factor, and outputs corresponding 2-phase digital signals (A and B phases) and a zero point detection digital signal (Z phase). It incorporates a built-in EEPROM for interpolation switching and input signal adjustment functions, providing support for system miniaturization and high-speed input/output signal operation.

Evaluation and programming boards provide quick solution to evaluating and implementing into production.



Block Diagram

Key Features

  • Interpolation switching function : ×1, 2, 4, 5, 8, 10, 16, 20, 32 (selectable)
  • Input frequency : 500kHz (max)
  • Output frequency : 2.5MHz (max)
  • Package : QFN24 (size: 4mm × 4mm)
  • Supply voltage : 2.7 to 5.5V
  • Current consumption : 25mA (typ)
  • Operating temperature range : – 40 to +125°C
  • Supported Differential input / output
  • Digital output plus Analog signal output after signal conditioning


  • ABZ encoder Interpolation
  • 2-D and 3-D positioning (X-Y, T-X, X-Y-Z
  • Precision Linear slides and Rotary mechanism
  • Laser Targeting (medical or other)
  • Metrology / Measuring equipment
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