High Linearity
Position Sensing Detector
1L20 -
one dimensional PSD
The SiTek 1L20 PSD functions accor-
ding to the Lateral Effect-Photodiode prin-
ciple. It is an analogue device and therefore
displays excellent position resolution. The
resolution is determined by the system sig-
nal-to noise ratio.
The 1L20 is operated in the biased mode.
Typical applications include: distance and
height measurement, alignment, position
and motion measurements and vibration
studies.
Special UV- or YAG-enhanced and
Nuclear versions are available.
Parameter Symbol Min. Typ. Max. Unit
Active area 20 x 3 mm
2
Position non-linearity 0,1 0,2 %(±)
Detector resistance Rdet 40 50 80 k ý
Dark current Id 50 250 nA
Noise current Inoise 0,5 1,0 pA/šHz
Responsivity r 0,63 A/W
Capacitance Cj 45 55 pF
Rise time (10-90%) tr 0,5 1,0 µs
Reverse voltage (bias) Vr 51520V
Thermal drift 20 100 ppm/°C
Maximum ratings
Reverse voltage VR-max 30 V
Operating temperature Toper 70 °C
Storage temperature Tstg 100 °C
Test conditions:
Package:
Room temperature 23°C. Reverse voltage 15 V. Light-source wavelength 940 nm.
Position non-linearity and thermal drift are valid within 80% of the detector length.
22-pin ceramic DIL-package, 31,8 x 9,9 mm
2
, with protective window.