The ADPD103, ADPD105, and ADPD107, from ADI, are highly efficient photometric front ends with integrated 14-bit analog-to-digital converters (ADCs) and 20-bit burst accumulators that work in concert with flexible light emitting diode (LED) drivers. It is designed to stimulate an LED and measure the corresponding optical return signal. The data output and functional configuration occur over a 1.8 V I2C interface. The control circuitry includes flexible LED signaling and synchronous detection.
ADPD103 Features
- Multifunction photometric front end
- Fully integrated analog front end (AFE), analog-to-digital converter (ADC), light emitting diode (LED) drivers, and timing core
- Three 8 mA to 370 mA LED drivers
- Optical inputs: 1 to 8
- Three 8 mA to 250 mA LED drivers
- 20-bit burst accumulator enabling 20-bits per sample period
ADPD105 and ADPD107 Features
- Multifunction photometric front end
- Fully integrated analog front end (AFE), analog-to-digital converter (ADC), light emitting diode (LED) drivers, and timing core
- Three 8 mA to 370 mA LED drivers
- Optical inputs: 2
- SPI, I2C interface, and 1.8 V analog/digital core
- Three 8 mA to 250 mA LED drivers
- 20-bit burst accumulator enabling 20-bits per sample period
- Flexible sampling frequency ranging from 0.122 Hz to 3.820 kHz
Applications
- Body-worn health and fitness monitors
- Heart-rate monitors
- Industrial monitoring
- Background light measurements
- Clinical measurements
