ADPD105BCPZRL

Overview

The ADPD105BCPZRL is a multifunction photometric front end from Analog Devices, integrating an analog front end (AFE), a 14-bit analog-to-digital converter (ADC), and three LED drivers. It features a 20-bit burst accumulator for high-resolution data acquisition, supporting up to 27 bits per read with sample averaging. The device operates on a single 1.8 V supply and utilizes an I²C interface for control and data output. Key specifications include a sampling frequency range of 0.122 Hz to 3820 Hz, peak LED driver current of 370 mA, and low power consumption as low as 92 μA in single-channel mode.

Feature Summary

• Integrated AFE, 14-bit ADC, and three 370 mA LED drivers
• 20-bit burst accumulator enabling up to 27-bit resolution with averaging
• I²C serial interface with 1.8 V digital/analog core operation
• Flexible sampling frequencies ranging from 0.122 Hz to 3820 Hz

Applications

• Wearable health and fitness monitors
• Clinical measurements such as SpO₂
• Industrial monitoring systems
• Background light measurements

Procurement Notes

Verify the specific package type upon ordering, as the ADPD105 is available in both WLCSP and LFCSP configurations. Confirm that the I²C interface requirement aligns with the ADPD105 model, distinguishing it from the SPI-based ADPD106 and ADPD107 variants. Ensure compatibility with the 1.8 V supply voltage requirements for both analog and digital domains.

Selection Notes

Select the ADPD105 when an I²C interface is required for system integration. Choose this component over the ADPD106 or ADPD107 if the design necessitates the LFCSP package option, which offers eight dedicated photodiode inputs compared to the combined inputs in the WLCSP versions. Consider the 370 mA LED driver capability for applications requiring high-intensity optical signaling.

Part Context

The ADPD105 belongs to the ADPD10x family of photometric front ends, designed for optical sensing applications. It shares functional similarities with the ADPD106 and ADPD107 but differs primarily in its communication interface and available packaging options. While the ADPD106 and ADPD107 utilize SPI interfaces and are exclusively available in WLCSP packages, the ADPD105 supports I²C and offers flexibility with both WLCSP and LFCSP form factors.

Replacement Considerations

Direct replacements within the same family include the ADPD106 and ADPD107; however, these require SPI interface compatibility and are only available in WLCSP packages. For designs specifically requiring the LFCSP package or I²C connectivity, no direct pin-compatible substitutes exist outside the ADPD10x series.