Analog Devices Inc. ADPD142RG-BCEZ-RL

Overview

ADPD142RG-BCEZ-RL from Analog Devices is a fully integrated photometric module for optical biosensing, featuring red and green LEDs, a photodiode, dual-channel 250 mA LED drivers, 14-bit ADC with 20-bit burst accumulation, and ambient light rejection architecture. It operates via 1.8 V I²C interface and targets wearable heart rate and SpO₂ monitoring systems.

For engineers reviewing the ADPD142RG-BCEZ-RL datasheet, ADPD142RG-BCEZ-RL pinout, ADPD142RG-BCEZ-RL application, or ADPD142RG-BCEZ-RL equivalent, key selection considerations include dual-wavelength LED integration, on-chip 27-bit sample-to-sample accumulation, synchronous detection capability, and ambient DC/AC light rejection performance in reflective PPG topologies.

Technical Context

The ADPD142RG-BCEZ-RL implements synchronous detection with time-slot–based signal acquisition across two independent optical channels. Each channel supports separate LED timing control, AFE gain/offset configuration, and dedicated data registers for time-slot A and B outputs.

Its analog front end includes transimpedance amplifiers (TIA) with programmable gain, VBIAS control for photodiode biasing, and ambient light rejection circuitry that suppresses both DC and AC interference without external filtering. The digital core handles burst accumulation (20-bit per period) and on-chip sample-to-sample accumulation up to 27 bits per read.

Key Specifications

Pinout & Package

ADPD142RG-BCEZ-RL is housed in a 2.8 mm × 5 mm surface-mount module with 10-pin land pattern (0.5 mm pitch), integrating optical components and passive decoupling. Package is non-removable and optimized for reflective optical sensing placement.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar optical biosensing applications.

Compared with ADPD142RG-BCEZ-RL, ADPD105-ACBZ-RL7 demands external optical components and lacks ambient rejection circuitry, while MAX30101 offers smaller feature set and no hardware-based accumulation - making ADPD142RG-BCEZ-RL optimal for high-SNR, low-firmware-overhead wearable biosensing.

Availability

ADPD142RG-BCEZ-RL is available at Aetrix Electronics and suitable for wearable health monitors, fitness trackers, and smart band biometric subsystems requiring stable component supply, consistent optical performance, and long-term manufacturability.

Supply support for ADPD142RG-BCEZ-RL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision sensing and signal chain applications.

The ADPD142RG-BCEZ-RL belongs to Analog Devices' optical biosensor product line, engineered specifically for low-power, high-SNR reflective photoplethysmography in space-constrained wearables.

FAQ

What is the primary function of the ADPD142RG-BCEZ-RL in a wearable system?

The ADPD142RG-BCEZ-RL serves as a complete optical biosensor module, integrating red and green LEDs, a photodiode, dual-channel LED drivers, and an analog front end with ambient light rejection. It acquires synchronized PPG signals for heart rate and SpO₂ estimation. Its on-chip 27-bit accumulation and hardware-based ambient cancellation make ADPD142RG-BCEZ-RL ideal for motion-robust, low-power wearable implementations without requiring external optical components.

Does the ADPD142RG-BCEZ-RL support infrared (IR) light for SpO₂ measurement?

No - the ADPD142RG-BCEZ-RL integrates red and green LEDs, not infrared. While traditional SpO₂ uses red/IR ratios, this variant enables alternative SpO₂ estimation methods based on red/green absorption differences and calibrated algorithms. For IR-based SpO₂, the ADPD142RI-BCEZ-RL (red + IR) variant is specified. The ADPD142RG-BCEZ-RL datasheet explicitly defines its LED wavelengths as red and green.

How does ambient light rejection work in the ADPD142RG-BCEZ-RL?

The ADPD142RG-BCEZ-RL implements hardware-level ambient light rejection through synchronous detection and dedicated circuitry that separates ambient DC offset and AC interference (e.g., 50/60 Hz) from the modulated LED return signal. This is achieved within the analog front end prior to ADC conversion, eliminating reliance on software subtraction. The ADPD142RG-BCEZ-RL datasheet confirms rejection of both DC and AC ambient components without external filters or host processing.

What is the significance of the 27-bit sample-to-sample accumulator in the ADPD142RG-BCEZ-RL?

The 27-bit on-chip accumulator in the ADPD142RG-BCEZ-RL performs real-time averaging of successive PPG samples before readout, increasing effective resolution and SNR without increasing host MCU computational load or memory usage. This allows longer integration periods and better low-perfusion signal capture. Unlike external averaging, this accumulation occurs in hardware and is retained across reads - a confirmed feature in the ADPD142RG-BCEZ-RL functional block diagram and datasheet specifications.

Can the ADPD142RG-BCEZ-RL operate with a 3.3 V I²C interface?

No - the ADPD142RG-BCEZ-RL requires a 1.8 V I²C interface, as stated in the General Description and Electrical Characteristics sections of its datasheet. SDA and SCL pins are not 3.3 V tolerant. Using 3.3 V logic levels risks damage or unreliable communication. Level shifters or 1.8 V–compatible host controllers are mandatory. This voltage requirement is fixed for ADPD142RG-BCEZ-RL and differs from some other optical sensors offering wider I/O voltage ranges.