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.

Due to a high transimpedance gain of typically 4 M?, signal voltages of several hundred millivolts are obtained at low illumination levels. An output signal amplitude of 1 V is typical in low light conditions, for instance when iC-LSHB is illuminated at only 0.2 mW/cm² by a 740 nm LED.

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.

iC-Haus LSHB_001

• 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. 4 M?
Short-circuit-proof, low impedance voltage outputs for enhanced EMI tolerance
Space saving 15-pin optoBGA package (RoHS compatible)
Low power consumption from single 4.5 V to 5.5 V supply
Operational temperature range of -40 to 125 C
Available options
- reticle assembly, code discs
- customized COB modules


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Incremental Photosensor Array
Part #: LSHB2S42-1024
Incremental Photosensor Array