The SM3473 is an interpolation IC for use with MR sensors. It accepts 2-phase Cos/Sin analog signals from an MR sensor, and outputs a 2-phase incremental pulse with frequency generated by the division of the analog signal by a selectable 1, 2, 4, 8,16× interpolation factor. The analog signal is amplified, with the amplifier gain set by an external resistor voltage divider connected across the supply lines, before interpolation.

Block Diagram


  • Interpolation switching function : x1, x2, x4, x8, x16 (selectable)
    Version A : x1, x2, x4, x8
    Version B : x2, x4, x8, x16
  • Input frequency : 500kHz (max)
  • Supply voltage : 3.0 to 5.5V
  • Current consumption : 2.6mA (VDD=5V), 1.0mA(VDD=3.3V)
  • Input signal amplitude : 33mVpp to 600mVVpp(VDD=5V)
  • Analogue signal gain : 5 to 30 (21step)
  • Operating temperature range : – 20 to +85°C
  • Package : QFN16pin (size: 3mm × 3mm)


  • Camera lens
  • measuring device
  • industrial robot


3473_ND16007E00(404.4 KB)