SI251 Sin/Cos Interpolator Sine/Cosine Interpolator for quadrature encoders with separate TTL/HTL outputs

Model Numbers

SI251 Sine-Cosine Interpolator/Multiplier


  • Sine-Cosine Interpolator with adjustable multiplication rate, for use with sine/cosine encoder systems
  • Converts sine wave inputs with 1Vss standard level into incremental quadrature output signals
  • Outputs A, /A, B, /B, Z, /Z (RS422 / TTL) and A, B, Z ( 80 - 30 V HTL) 
  • Adjustable multiplier for interpolation rates from 1:5 to 1:50
  • Adjustable divider 1:1 - 1:128 to reduce the output frequency
  • Sine-input frequency 0 - 400 kHz 
  • Quadrature output frequency up to 4 MHz
  • Adjustable glitch filter
  • Power Supply 18-30 VDC

Circuit Diagram

SI251 Encoder Circuit Diagram

Ordering Information

SPLITTER MODEL  Inputs  Outputs 

 Sine/Cosine Inputs

A, /A, B, /B, Z, /Z TTL/RS422

A, B, Z (10-30V HTL)