18-Bit Opto Encoder with SPI and SER/PAR Interfaces (reticle LNB1R / 3xx80353)

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Product description

iC-LNB is an optoelectronic encoder IC for absolute linear and angle measuring systems, such as glass scales and encoders. Photodiodes, amplifiers, and comparators, the entire signal conditioning unit, and interfaces for position data output have been monolithically integrated into the device.

By help of the unique FlexCount circuit any angle resolution between 4 to 218 angle steps per revolution can be preset for the incremental signals and the absolute position value.


  • Absolute singleturn resolution of up to 18 bit
  • Incremental quadrature outputs with 1 to 65,536 CPR and programmable index signal
  • 3.3 V-compatible SPI and I/O ports for configuration and data
  • Serial data readout in 1 µs cycles at 16 MHz clock frequency
  • System-on-chip design for excellent reliability
  • Leading/trailing sampling of 10 binary tracks pitched at 400 µm
  • Analog sine/cosine scanning with enlarged photodiodes, signal conditioning and fast 8-bit vector-tracking interpolation
  • Unique FlexCount® circuit: freely selectable resolution for absolute and incremental data
  • LED illumination control by 50 mA high-side current source (sin2+cos2 or sum control modes)
  • Alarm indication for configuration or illumination error
  • Permanent RAM monitoring by parity bits
  • Parallel position data output for 16 bit
  • Operation at 4 V to 5.5 V within -40 °C to 110 °C
  • 30-pin optoBGA or 38-pin optoQFN package for SMT
  • Illumination: iC-SN85 BLCC SN1C (850 nm encoder LED)
  • Code discs:
    • LNB1S 42-1024 (1024 PPR, Ø 42 mm/18 mm)
    • LNB4S 26-1024 (1024 PPR, Ø 26.0 mm/9.6 mm)


  • Optical position sensors
  • Absolute rotary encoders
  • Programmable incremental encoders
  • Motor feedback systems
  • Linear scales
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