IC-LSHB_17 Datasheet, PDF (2/9 Pages) IC-Haus GmbH – INCREMENTAL PHOTOSENSOR ARRAY

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
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 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.