The optical encoder iC-PN2656 features 24 monolithically integrated photosensors arranged as a phased-array. The high transimpedance gain of typically 4 MΩ (1 MΩ) generates output signals of a few hundred millivolts already from illumination levels of 1 to 3 mW/cm2. In most cases no additional measures must be considered to filter for noise and interferences.
Analog nonius-scale encoders are the typical application for iC-PN2656. Its 3-track scanning features a phased-array of 8 photosensors each per track, generating positive and negative going sine signals, as well as positive and negative going cosine signals. An excellent matching and common mode behavior of the differential signal paths is obtained by a paired amplifier design, reducing the needs for external signal calibration to an absolute minimum.
The spectral sensitivity range includes visible to near infrared light, with the maximum sensitivity being close to a wavelength of 680 nm. An output voltage of approximately 1 V is typical under low light conditions, for instance when iC-PN2656 is illuminated at only 1.3 mW/cm2 by an 740 nm LED.
• Absolute position encoders
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