iC-LSHB

INCREMENTAL PHOTOSENSOR ARRAY

Rev D1, Page 2/9

DESCRIPTION

iC-LSHB is an optical sensor IC with 6 integrated pho-

todiodes whose signal currents are converted into

output voltages by low-noise transimpedance ampli-

fiers.

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 neg-

ative 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 differ-

ential 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 MΩ gener-

ates output signals of a few hundred Millivolts already

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 tem-

peratures.

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.

PACKAGING INFORMATION

PAD LAYOUT (2.88 mm x 2.04 mm)

PAD FUNCTIONS

No. Name Function

Refer to the description of pin functions.

Note: Dimension G4 is the reference

radius of the chip center.