ADPD2140 Infrared Light Angle Sensor

ADI's ADPD2140 is an infrared light angle sensor. The light angles calculated from the device's response are linear to ±5° within an angular field of view of ±35°. The ADPD2140 has a radiant sensitive area of 0.31 mm². An integrated visible light blocking optical filter on the ADP2140 provides built-in rejection of unwanted visible ambient light signals, such as sunlight and indoor lighting. The low junction capacitance and low dark current of the ADP2140 allow optimal integration with the ADPD1080 photometric front end. This solution offers additional ambient light rejection, low power operation and analog-to-digital conversion of the ADPD2140 analog signals.

The ADPD2140 can be used with a synchronous infrared light source such as a light emitting diode (LED) to detect user hand movements for gesture recognition. The device requires four photodiode channels. Packaged in a small, clear mold, 2 mm x 3 mm, 8-lead LFCSP, the ADPD2140 is specified over the −40°C to +85°C operating temperature range. The ADPD2140 is perfect for industrial monitory, proximity sensing, and object tracking applications.

The ADPD1080/ADPD1081 are photometric front ends, each with an integrated 14-bit analog-to-digital converter (ADC) and a 20-bit burst accumulator designed to work with light emitting diode (LED) drivers. These front ends stimulate an LED and measure the corresponding optical return signal. The data output and functional configuration occur over a 1.8 V I²C interface on the ADPD1080 or a serial port interface (SPI) on the ADPD1081. The control circuitry includes flexible LED signaling and synchronous detection.

The ADPD1080/ADPD1081 can be used with any LED. The ADPD1080 is available in a 16-ball, 2.46 mm × 1.4 mm WLCSP and a 28-lead, 4 mm × 4 mm LFCSP. The SPI only version, ADPD1081, is available in a 17-ball, 2.46 mm × 1.4 mm WLCSP.