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Analog Devices Inc. ADPD144RI-ACEZ-RL
- Part No.:
- ADPD144RI-ACEZ-RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Sensor and Detector Interfaces
- Package:
- 12-LFLGA
- Datasheet:
-
ADPD144RI-ACEZ-RL.pdf
- Description:
- OPTICAL BIOMETRIC TRANS RED & IN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ADPD144RI-ACEZ-RL from Analog Devices is a fully integrated PPG optical sensor module combining 660 nm red and 880 nm infrared LEDs, a 4-channel deep-diffusion photodiode array, and a mixed-signal ASIC with dual-time-slot AFE, 14-bit ADC, burst accumulator (up to 20 bits), and I²C interface - designed for reflective SpO₂ and heart rate monitoring in wearables under glass windows.
For engineers reviewing the ADPD144RI-ACEZ-RL datasheet, ADPD144RI-ACEZ-RL pinout, ADPD144RI-ACEZ-RL application, or ADPD144RI-ACEZ-RL equivalent, this page delivers verified technical context, real-world timing constraints, LED driver programmability (8.5–370 mA), saturation illuminance per TIA gain setting, and SNR-optimized optical isolation architecture - all critical for low-power, high-SNR wearable biosensing design.
Technical Context
The ADPD144RI-ACEZ-RL implements synchronous time-division multiplexing across two independent time slots (A and B), each supporting 1–255 programmable LED pulses, separate AFE gain/filter settings, and dedicated LED driver control - enabling simultaneous red/IR acquisition with ambient light rejection. Its 4-channel photodiode matrix supports configurable channel mapping (1×4 or 2×2 summing) via Register 0x14.
Signal chain includes a transimpedance amplifier (TIA) with selectable gains (25–200 kΩ), band-pass filtering, integrator, and 14-bit ADC with burst accumulation (20-bit/sample) and sample-to-sample averaging (up to 27-bit effective resolution). Timing core provides precise pulse delay, width (3 µs typ), and period (19 µs typ) control, with minimum inter-sample sleep time of 200 µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Wavelengths | 660 nm (red, LED1) and 880 nm (IR, LED2) - optimized for hemoglobin absorption differential in SpO₂ calculation. |
| LED Peak Current Range | 8.5 mA to 370 mA - programmable per channel via registers 0x23–0x25, enabling dynamic power/SNR trade-off. |
| ADC Resolution & Accumulation | 14-bit base resolution; 20-bit burst accumulator (per time slot); up to 27-bit effective resolution with sample averaging - supports high-dynamic-range PPG waveform capture. |
| Saturation Illuminance (Through Skin) | 140 kLux at 25 kΩ TIA gain - defines maximum ambient light tolerance before signal clipping in reflective measurement. |
| Sampling Frequency Range | 0.122 Hz to 3.48 kHz - adjustable via Register 0x12; highest rate requires Time Slot B only, 1 pulse/sample, 200 µs sleep. |
| Supply Current (Active) | 151 µA at 100 Hz, both time slots active - enables multi-day battery life in coin-cell-powered wearables. |
| Interface | I²C (1.8 V logic, 400 kHz max) with interrupt (INT) output - supports low-pin-count host integration and event-driven data reads. |
Pinout & Package
ADPD144RI-ACEZ-RL uses a compact 2.8 mm × 5.0 mm surface-mount module (CE-12-2 package) with 12-pin layout optimized for optical isolation: integrated LEDs and photodiodes are physically separated and shielded within the custom optical cavity to minimize direct reflection and crosstalk.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LGND | LED Ground | Separate ground return for LED drivers to prevent analog noise coupling into photodiode signal path. |
| SDA / SCL | I²C Data/Clock | 1.8 V bidirectional I²C interface; supports register configuration, FIFO readout, and interrupt polling. |
| DGND / AGND | Digital/Analog Ground | Isolated ground domains preserve AFE SNR; must be connected externally with low-impedance trace. |
| VDD1 / VDD2 | 1.8 V Core Supply | Dual 1.8 V inputs power digital logic and analog circuitry independently to reduce supply noise sensitivity. |
| VREF | Analog Reference | Bypassed with 1 µF capacitor to AGND; stabilizes ADC reference and AFE bias points. |
| VLED | LED Anode Supply | 3.0–4.3 V input powering both integrated LEDs; compliance voltage ≥0.2 V above LGND required. |
| LEDX1 / LEDX2 | External LED Cathode Outputs | Unconnected when using internal LEDs; used only to drive external emitters with independent current sinks. |
| INT | Interrupt Output | Open-drain signal indicating data ready or error condition; reduces host polling overhead. |
Key Features
| Feature | Design Value |
|---|---|
| Custom optical package under glass | Enables seamless integration into curved watch bezels or fitness tracker housings without optical misalignment or stray light ingress. |
| Independent AFE per time slot | Allows separate gain, filter, and integration settings for red and IR channels - essential for calibrating wavelength-specific tissue attenuation. |
| Programmable LED drivers (2-channel) | Supports dynamic current adjustment (8.5–370 mA) and timing (pulse width/period/delay) to optimize SNR per illumination condition. |
| Burst accumulator + sample averaging | Delivers up to 27-bit effective resolution without external DSP - reduces host MCU computational load in resource-constrained wearables. |
| Ultralow direct optical reflection design | Minimizes LED-to-PD crosstalk via physical separation and optical shielding - improves DC baseline stability and AC pulsatile signal fidelity. |
Applications
| Wearable Heart Rate Monitoring | Reflective Pulse Oximetry (SpO₂) |
|---|---|
Use Scenario: Continuous wrist-based heart rate tracking during exercise and rest using green/red/IR LEDs. IC Role / Device Role / Timing Role: Primary PPG front end performing synchronous red/IR sampling in alternating time slots with ambient-rejecting burst integration. Use Value: Achieves <1% HR error vs. ECG reference at 150 BPM due to 200 µs minimum inter-sample sleep and 27-bit accumulated data resolution. |
Use Scenario: Non-invasive blood oxygen saturation estimation on fingertip or earlobe using dual-wavelength reflectance. IC Role / Device Role / Timing Role: Dual-channel optical sensor capturing synchronized 660 nm and 880 nm PPG waveforms with independent AFE tuning per wavelength. Use Value: Enables R-value (red/IR AC ratio) calculation with <±2% SpO₂ accuracy across 70–100% saturation range via calibrated TIA gain and LED current matching. |
| Fitness Tracker Optical Sensing | Low-Power Biosensor Module |
Use Scenario: Step-counting and activity classification using motion-artifact-resilient PPG signal morphology. IC Role / Device Role / Timing Role: Integrated optical sensing subsystem providing raw time-domain PPG data with programmable sampling frequency (0.122–3.48 kHz). Use Value: Supports adaptive sampling (e.g., 25 Hz at rest, 100 Hz during motion) to extend battery life while preserving waveform fidelity for ML-based activity inference. |
Use Scenario: Compact, turnkey optical sensing solution for space-constrained medical patches or hearables. IC Role / Device Role / Timing Role: Self-contained PPG module with embedded timing core, LED drivers, AFE, ADC, and I²C interface - no external clock or driver ICs required. Use Value: Reduces BOM count by 7+ components and PCB area by >40% versus discrete LED+AFE+ADC implementations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar optical sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX30102 | Integrated 500 nm green + 850 nm IR LEDs; 18-bit ADC; no burst accumulator; fixed 25 mA LED drive. | Limited to green/IR SpO₂; lacks red channel and programmable LED current - lower flexibility for skin-tone compensation. | Choose MAX30102 for cost-sensitive green-based HRM where red/IR dual-wavelength SpO₂ is not required. |
| AFE4404 | Standalone AFE (no integrated LEDs/PDs); 24-bit ADC; supports external LED drivers; SPI interface. | Requires external optical components and driver circuitry; higher design complexity but greater customization for clinical-grade systems. | Choose AFE4404 when full optical stack control (LED type, PD size, optical path) is needed for regulatory-critical applications. |
Compared with MAX30102 and AFE4404, the ADPD144RI-ACEZ-RL uniquely integrates red/IR emitters, 4-channel photodiode, and dual-time-slot AFE in one 2.8×5.0 mm module - delivering out-of-box SpO₂ capability with programmable LED current and 27-bit resolution, eliminating external component selection and layout risk.
Availability
ADPD144RI-ACEZ-RL is available at Aetrix Electronics and suitable for wearable health monitors, fitness trackers, and clinical-grade biosensors requiring stable component supply, long-term lifecycle support, and consistent optical performance across production batches.
Supply support for ADPD144RI-ACEZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, healthcare, and industrial markets since 1965.
The ADPD144RI-ACEZ-RL belongs to Analog Devices' ADPD family of photometric front ends - engineered specifically for ultra-low-power, high-SNR optical biosensing in size- and power-constrained wearable devices.
FAQ
What is the primary function of the ADPD144RI-ACEZ-RL in a wearable system?
The ADPD144RI-ACEZ-RL serves as a complete photoplethysmography (PPG) front end, integrating red and infrared LEDs, a 4-channel photodiode, and an ASIC with dual-time-slot AFE, ADC, and I²C interface. It captures synchronized optical signals for heart rate and SpO₂ calculation without external timing or driver components - making it ideal for wrist-worn and patch-style wearables where board space and power are constrained.
Can the ADPD144RI-ACEZ-RL operate with external LEDs, and how is that configured?
Yes, the ADPD144RI-ACEZ-RL supports external LEDs via its LEDX1 and LEDX2 pins, which act as programmable current-sink outputs. To use external emitters, leave the internal LEDs unconnected and drive the external LED cathodes from LEDX1/LEDX2 while supplying appropriate anode voltage to VLED. The same register-controlled LED timing and current settings apply - ensuring consistent operation whether using internal or external LEDs.
How does the ADPD144RI-ACEZ-RL achieve ambient light rejection in reflective measurements?
The ADPD144RI-ACEZ-RL achieves ambient light rejection through synchronous detection: its LED emitters pulse only during precisely timed AFE sampling windows, and the analog front end integrates signal only during those active periods. Combined with optical isolation between LEDs and photodiodes, TIA gain selection, and dual-time-slot architecture, this eliminates both DC and AC ambient interference - enabling reliable PPG acquisition even in bright indoor or outdoor environments.
What is the significance of the 27-bit effective resolution in the ADPD144RI-ACEZ-RL?
The 27-bit effective resolution results from cascaded accumulation: the 14-bit ADC output is first burst-accumulated across up to 255 pulses (yielding up to 20 bits), then further averaged across up to 128 samples (adding up to 7 more bits). This extended resolution preserves subtle PPG waveform features - such as AC pulsatility amid large DC offsets - critical for accurate heart rate variability (HRV) and low-perfusion SpO₂ measurements without external oversampling or post-processing.
Does the ADPD144RI-ACEZ-RL require a specific power-up sequence or external clock source?
No, the ADPD144RI-ACEZ-RL does not require a specific power-up sequence - VDD1, VDD2, and VLED may be applied in any order. It also contains an integrated 32 MHz oscillator and 32 kHz clock generator; no external crystal or clock source is needed. All timing, including LED pulsing, AFE sampling, and ADC conversion, is derived from these on-chip clocks - simplifying system design and reducing bill-of-materials.
ADPD144RI-ACEZ-RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 12-LFLGA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Front End
- Input Type:
- Photodiode
- Output Type:
- I2C
- Current - Supply:
- 9.3 mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LGA-CAV (2.8x5)
ADPD144RI-ACEZ-RL FAQ
1.How can I place an order for ADPD144RI-ACEZ-RL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADPD144RI-ACEZ-RL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADPD144RI-ACEZ-RL reliable?
The price and inventory of ADPD144RI-ACEZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADPD144RI-ACEZ-RL is usually 5 days.
3.What payment methods are accepted for ADPD144RI-ACEZ-RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADPD144RI-ACEZ-RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADPD144RI-ACEZ-RL?
ADPD144RI-ACEZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADPD144RI-ACEZ-RL order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADPD144RI-ACEZ-RL?
For technical support, including ADPD144RI-ACEZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADPD144RI-ACEZ-RL requirements.
6.How does Aetrix verify that ADPD144RI-ACEZ-RL is sourced from the original manufacturer or authorized distributors?
All ADPD144RI-ACEZ-RL products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADPD144RI-ACEZ-RL meets industry standards.
7.What is the process for return or replacement of ADPD144RI-ACEZ-RL?
All ADPD144RI-ACEZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with ADPD144RI-ACEZ-RL, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADPD144RI-ACEZ-RL part is unused and in its original packaging.
Return procedure for ADPD144RI-ACEZ-RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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