High Resolution 3-channel Encoder Modules with Line Driver IC

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The Broadcom AEDL-981x is a series of high resolution 3-channel optical incremental encoder modules with integrated differential line driver IC supporting RS-422 outputs. Based on the Broadcom AEDT-981x encoder and the AM26C31Q line driver IC, the AEDL-981x supports a wide range of encoding resolution from 1,000 to 5,000 counts per revolution (CPR) using a codewheel of 11mm optical radius and provides complementary outputs for each encoder channel (i.e., A, A/, B, B/, I, and I/). Recommended line receiver ICs for the AEDL-981x include the AM26LS32 and AM26LS33. The module series is industrial grade with operating temperature from -40 °C to +115 °C. 

With built-in LED brightness autoregulation, the AEDL-981x maintains an optimal encoder performance across spatial corners with low current consumption. The AEDL-981x offers a wide spatial error tolerance of 0.4 mm and codewheel gap range of +/-0.15 mm, providing ease of motor shaft alignment and enhancing photo detector signal integrity.


  • Operating Temperature: -40°C to +115°C 
  • Dual Channel Quadrature Outputs with Index Pulse Output
  • Complementary Outputs with Industry Standard Line Driver IC
  • Encoding Resolution: 1,000, 1,024, 1,250, 2,000, 2,048, 2,500, 4,000, 4,096,  and 5,000 CPR
  • Low Power Consumption (Typical 20mA Icc)
  • No Signal Adjustment Required
  • Pin Compatible to Legacy HEDS-9xxx Series
  • Spatial Play Tolerance of Ø 0.40 mm
  • Codewheel Gap Range of +/-0.15 mm
  • ESD Immunity HBM 4kV (JESD22-A114D)
  • Small Form Factor: 26.67 mm (L) x 20.8 mm (W) x 10.16 mm (H)



The AEDL-981x is suitable for a wide range of commercial and industrial motion control applications including, but not limited to:
  • DC Servo Motors
  • Linear and Rotary Actuators
  • Factory Automation Equipment
  • 3D Printers
  • Robotics
  • Unmanned Aerial Vehicles (UAV) or Drones


Lifecycle Status

Limited Release

Substance Compliance

  • RoHS6
    Fully Compliant
Specification Value
Lifecycle Limited Release
Distrib. Inventory No
RoHS6 Compliant Y
Line Driver Y
Motion Type Rotary
Optical Method Transmissive
Output Type Digital
Number of Channels 3
Shaft Diameter (Unit of Measure) mm
Power (W) 5
Optical Radius (mm) 11.0
Resolution 5000