iC-LTA oQFN32-5x5

6 Channel Incremental Opto Encoder

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Product description

iC-LTA is an advanced optical encoder IC
featuring an array of photosensors which are evaluated by an on-chip interpolation circuit.

The device provides differential A/B and index tracks, and 3 tracks to generate block commutation signals (UVW).
The line count and the optical radius is free and determined by the code disc design applied.

Operating mode and index gating options are adjusted at two multi-level inputs. An averaging LED power controller outbalances aging and temperature effects.


  • Monolithic photodiode array with excellent signal matching
  • Very compact size for small encoders
  • Moderate track pitch for relaxed assembly tolerances
  • Low noise signal amplifiers with high EMI tolerance
  • Pin-selectable operating modes: analog, comparated (x1), interpolated (x2, x4)
  • Pin-selectable index gating: ungated (1 T), B-gated (0.5 T), AB-gated (0.25 T)
  • Complementary quadrature outputs: A, B, Z and NA, NB, NZ
  • Commutation signal outputs: U, V, W
  • Short-circuit-proof, current-limited, +/- 4 mA push-pull
  • Analog signal output for ease of alignment and resolution enhancement by external interpolation
  • LED power control with 40 mA high-side driver
  • Low power consumption from single 3.5 V to 5.5 V supply
  • Operating temperature range of -40 °C to +120 °C
  • Space saving optoQFN / optoBGA packages (RoHS compliant)
  • Custom made code disc and reticle designs on request


  • Incremental encoder
  • Brushless DC motor commutation
  • Industrial drives
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