SM3473

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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.

Datasheets

PDFSM3473.pdf

Block Diagram

Key Features

  • 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)

Applications

  • Industrial machine or robot
  • 2-D and 3-D positioning (X-Y, T-X, X-Y-Z
  • Optical Lens focus (Camera)
  • Metrology / Measuring equipment
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