The ADPD1081 is a highly efficient, photometric front end, with an integrated 14-bit analog-to-digital converter (ADC) and a 20-bit burst accumulator that works with flexible light emitting diode (LED) drivers. The ADPD1081 stimulates an LED and measures the corresponding optical return signal. The data output and functional configuration occur over a serial port interface (SPI). The control circuitry includes flexible LED signaling and synchronous detection.
The analog front end (AFE) features rejection of signal offset and corruption due to modulated interference commonly caused by ambient light without the need for optical filters or dc cancellation circuitry that requires external control.
Couple the ADPD1081 with a low capacitance photodiode of <100 pF for optimal performance. The ADPD1081 can be used with any LED. The ADPD1081 is available in a 17-ball, 2.46 mm × 1.4 mm WLCSP.
