Incremental Photosensor Array

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iC-LSHB is an optical sensor IC with 6 integrated photodiodes whose signal currents are converted into output voltages by low-noise transimpedance amplifiers.

The IC is well suited for the operation of interpolation circuits for linear or rotary incremental encoders with an index signal. iC-LSHB thus has a shamrock-style sensor layout of four photodiodes, each with an active area of 800 µm x 330 µm. Both a positive and negative sine signal and a positive and negative cosine signal are generated from a single shared code track. The signal amplifier layout ensures excellent paired channel matching, reducing signal differences to an absolute minimum.

Two separate photodiodes, with active areas of 1720 µm x 150 µm apiece, are employed for the differential scanning of the index track and to generate the zero signal.

The spectral sensitivity ranges from visible to near infrared light, with the maximum sensitivity close to a wavelength of 680 nm.

A high transimpedance gain of typically 1 M  generates output signals of a few hundret Millivolts already from illumination levels of 0.8 mW/cm2.

A threefold intensity is sufficient when using iC-LSHB for encoder applications with typical disc and mask codes. Therefore, a relatively low LED current is enough to operate the sensor, proving beneficial to the life expectancy of the LED at high operating temperatures.

iC-LSHB is suitable for on-chip or LED-end mounting of the grating (reticle), so that the period count, signal waveform, phase shift and index marker code can be selected with flexibility.


• Incremental rotary encoders
• Linear scales

Symmetry Electronics (and its e-commerce division: is an authorized iC-Haus distributor.


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Monolithic array of independent photosensors with excellent matching
Compact photosensor size of 800 m x 330 m enabling smaller encoder systems
Moderate track pitch for reasonable alignment tolerances
Ultra low dark currents for operation to high temperature
Low noise amplifiers with high transimpedance of typ. 1 M
Short-circuit-proof, low impedance voltage outputs for enhanced EMI tolerance
Space saving optoBGA and optoQFN package (RoHS compliant)
Low power consumption from single 4.5 V to 5.5 V supply
Operational temperature range of -40 C to +110 C
Available options
- reticle assembly, code discs
- customized COB modules

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Incremental Photosensor Array
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Incremental Photosensor Array