ADPD103BCPZRL

Overview

The ADPD103BCPZRL is a multifunction photometric front end from Analog Devices, integrating an analog front end (AFE), a 14-bit analog-to-digital converter (ADC), LED drivers, and a timing core. It supports up to three independent LED drivers with peak currents ranging from 8 mA to 250 mA and accommodates one to eight optical inputs via photodiode connections. The device features a 20-bit burst accumulator for high-resolution signal capture and includes on-board sample-to-sample accumulation to achieve up to 27 bits of data resolution. Operating on a single 1.8 V supply, it utilizes an I2C interface for configuration and data retrieval, enabling flexible sampling frequencies between 0.122 Hz and 3.820 kHz.

Feature Summary

• Integrated AFE with 14-bit ADC and 20-bit burst accumulator
• Three programmable LED drivers supporting 8 mA to 250 mA peak current
• Supports 1 to 8 optical inputs with separate data registers per combination
• On-board sample-to-sample accumulator enabling up to 27 bits per data read

Applications

• Body worn health and fitness monitors, such as heart rate monitoring
• Clinical measurements including SpO2
• Industrial monitoring systems
• Background light measurements

Procurement Notes

Verify the specific package variant upon ordering, as the ADPD103 is available in both 28-lead LFCSP_WQ and 16-ball WLCSP configurations. Confirm that the selected suffix corresponds to the required reel quantity and packaging format. Ensure compatibility with the 1.8 V digital and analog supply requirements during system design.

Selection Notes

Select the appropriate package based on board space constraints; the 28-lead LFCSP offers individual pin access for all eight photodiodes, while the 16-ball WLCSP combines PD1-PD4 and PD5-PD8 into shared pins. Consider the maximum LED peak current requirement, as the device supports up to 250 mA. Verify that the connected photodiodes have an input capacitance below 100 pF for optimal performance.

Part Context

The ADPD103 belongs to the ADPD series of photometric front ends designed for optical sensing applications. It replaces discrete solutions by combining signal conditioning, digitization, and LED driving into a single chip. The BC suffix typically denotes the commercial temperature range and specific manufacturing lot or revision within the Analog Devices portfolio.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should evaluate other ADPD family members or comparable integrated photometric front ends if the ADPD103 is unavailable, ensuring pinout and functional compatibility.