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Analog Devices Inc./Maxim Integrated MAX86141ENP+T
- Part No.:
- MAX86141ENP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Specialized Sensors
- Package:
- Datasheet:
-
MAX86141ENP+T.pdf
- Description:
- SENSOR - OXIMETER/HEART RATE SPI
- Quantity:
- Payment:
- Shipping:
Inventory:5,076
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Product details
Overview
MAX86141ENP+T from Analog Devices is a dual-channel, ultra-low-power optical data acquisition IC for wearable health monitoring. It integrates three 8-bit LED current DACs (up to 124mA full-scale), two simultaneous 19-bit current-mode ADCs, analog/digital ambient light cancellation, and a 128-word FIFO - all in a 2.048 × 1.848 mm WLP. It enables high-accuracy SpO₂ and heart rate measurement in wrist-worn devices under strong ambient light.
For engineers reviewing the MAX86141ENP+T datasheet, MAX86141ENP+T pinout, MAX86141ENP+T application, or MAX86141ENP+T equivalent, key selection criteria include dual-channel PPG readout capability, >70dB 120Hz AC ambient rejection, 14.8–117.3μs programmable integration time, and autonomous SPI-controlled operation with <11μA optical channel current at 25sps.
Technical Context
The MAX86141ENP+T implements a continuous-time sigma-delta 19-bit current-mode ADC per channel with programmable full-scale ranges (4–32μA) and four integration times (14.8/29.4/58.7/117.3μs). Its ambient light cancellation combines analog front-end subtraction and digital post-processing to achieve >100μA DC ambient tolerance and >70dB rejection at 120Hz.
It features three independent low-dropout LED drivers with 8-bit resolution and four full-scale current ranges (31/62/93/124mA), supporting single- or multi-pulse sequences via register-programmable LED sequence control (LEDC1–LEDC6). The device operates autonomously using internal 32kHz and 10MHz oscillators, with SPI interface and interrupt-driven FIFO management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Optical Channels | Dual simultaneous PPG readout paths - enables concurrent red/IR or multi-site sensing without time multiplexing overhead. |
| ADC Resolution | 19-bit current-mode sigma-delta - delivers >89dB dynamic range (white card loop-back) and >110dB for HRM with on-chip averaging. |
| LED Driver Accuracy | 8-bit DAC with ±1 LSB DNL - ensures precise, repeatable LED current control critical for ratiometric SpO₂ calculation. |
| Ambient Rejection | >70dB at 120Hz AC + >100μA DC ambient photodiode current - allows reliable operation under indoor lighting and sunlight exposure. |
| Power Efficiency | <11μA optical readout current at 25sps (LP_MODE=1) - extends battery life in coin-cell-powered wearables beyond 7 days. |
| Integration Time | Programmable 14.8 / 29.4 / 58.7 / 117.3 μs - balances motion artifact suppression, SNR, and power for HR vs. SpO₂ optimization. |
| FIFO Depth | 128-word, 3-byte entries with 5-bit tag - buffers timestamped, channel-tagged PPG samples to decouple sensor acquisition from host MCU polling latency. |
Pinout & Package
MAX86141ENP+T uses a 20-ball wafer-level package (WLP), 2.048 × 1.848 mm, 0.4 mm ball pitch, compatible with standard reflow assembly. Bump-side-down top view with A1–D5 grid layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD_ANA (C2) | Analog supply input | 1.7–2.0V regulated source; requires local 0.1μF + 10μF bypass to GND_ANA for ADC noise immunity. |
| VDD_DIG (C3) | Digital logic supply | 1.7–2.0V supply for SPI interface and control logic; separate from analog rail to prevent digital switching noise coupling. |
| VLED (A1) | LED driver power input | 3.1–5.5V external supply; powers all three LED drivers with low dropout compliance down to 160mV at 31mA. |
| PD1_IN (D5), PD2_IN (D4) | Photodiode cathode inputs | Dual differential-capable inputs accepting up to 65pF photodiode capacitance; each paired with dedicated AFE path. |
| LED1_DRV (D1), LED2_DRV (C1), LED3_DRV (B1) | LED current sink outputs | Three independent 8-bit current DACs; drive LED cathodes directly - anodes connect to VLED. |
| SCLK/SDI/SDO/CSB (A2–A5) | SPI interface signals | 4-wire SPI up to 4MHz; supports burst reads of 3-byte FIFO entries with automatic RD_PTR advancement. |
| INT (B2) | Programmable interrupt output | Open-drain active-low signal indicating FIFO non-empty, FIFO overflow, or conversion completion. |
| GPIO1/GPIO2 (B3/B4) | Configurable I/O pins | GPIO1 supports external sync pulse (≥5μs); GPIO2 accepts 32.768kHz clock input for sample timing reference. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel simultaneous acquisition | Enables concurrent red/IR PPG capture for real-time SpO₂ computation without inter-channel timing skew or multiplexing delay. |
| Picket fence detect & replace | Hardware-accelerated motion artifact correction that identifies and substitutes corrupted samples using predictive interpolation. |
| Two-stage ambient cancellation | Analog subtraction + digital filtering achieves >70dB 120Hz rejection and handles >100μA DC ambient - eliminates need for mechanical shielding. |
| Autonomous low-power operation | Internal oscillators and register-configurable LP_MODE reduce optical channel current to <11μA at 25sps - no host intervention required between samples. |
| Flexible LED sequencing | 6-register LED sequence engine (LEDC1–LEDC6) supports up to 7 LED combinations per cycle - enables multi-wavelength or multi-site protocols. |
Applications
| Wrist-Worn Pulse Oximetry | Finger-Clip SpO₂ Monitor |
|---|---|
Use Scenario: Continuous blood oxygen saturation (SpO₂) and perfusion index tracking during sleep or ambulatory care. IC Role / Device Role / Timing Role: Dual-channel optical AFE acquires synchronized red (660nm) and IR (850nm) PPG waveforms; internal 19-bit ADCs resolve subtle AC/DC ratios for ratiometric SpO₂ calculation. Use Value: >110dB dynamic range and >70dB ambient rejection enable clinical-grade accuracy even under bedside lamp illumination. | Use Scenario: Clinical or home-use fingertip SpO₂ measurement with rapid (<1s) convergence and motion robustness. IC Role / Device Role / Timing Role: Single-shot dual-wavelength acquisition with 117.3μs integration time; picket fence detection replaces motion-corrupted samples in real time. Use Value: Sub-1% SpO₂ error across 70–100% saturation range due to low dark current noise (<56pA RMS) and on-chip averaging. |
| Earbud-Based Heart Rate Monitoring | Muscle Oxygen Saturation (SmO₂) |
Use Scenario: Real-time heart rate and HRV analysis in compact wireless earbuds with minimal PCB area. IC Role / Device Role / Timing Role: Ultra-compact WLP (2.05×1.85mm) hosts both optical channels and LED drivers; SPI interface minimizes trace count to host SoC. Use Value: <11μA optical channel current at 25sps extends Bluetooth earbud battery life to >10 days per charge. | Use Scenario: Sports science wearable measuring localized muscle deoxygenation during exercise using near-infrared spectroscopy (NIRS). IC Role / Device Role / Timing Role: Supports up to six LED wavelengths via external 3×2:1 mux controlled by LED sequence registers; dual ADCs capture multi-spectral reflectance simultaneously. Use Value: Programmable 4–32μA ADC full-scale range and 19-bit resolution resolve small NIR absorption changes (<0.1%) for SmO₂ quantification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar optical sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX86140ENP+T | Single-channel PPG AFE; identical LED drivers, FIFO, and ambient rejection architecture but only one photodiode input path. | Suitable for cost-sensitive or space-constrained HR-only designs where dual-wavelength SpO₂ is not required. | Select MAX86140ENP+T when system only needs one optical channel and lower BOM cost is prioritized over SpO₂ capability. |
| AS7341 | 11-channel spectral sensor with 16-bit ADC; no integrated LED drivers - requires external LED control and lacks ambient cancellation circuitry. | Targeted at color/flicker sensing and basic proximity; not validated for medical-grade PPG or SpO₂ algorithms. | Choose AS7341 only for non-medical spectral analysis; MAX86141ENP+T is required for regulatory-compliant wearable oximetry. |
Compared with MAX86140ENP+T, the MAX86141ENP+T adds a second independent optical channel enabling true concurrent dual-wavelength acquisition - essential for motion-robust SpO₂ - while maintaining identical power efficiency, ambient rejection, and WLP footprint. Against AS7341, it provides purpose-built PPG signal chain integration, eliminating external driver design and ambient compensation firmware effort.
Availability
MAX86141ENP+T is available at Aetrix Electronics and suitable for wearable fitness trackers, clinical-grade pulse oximeters, and earbud-based biometric monitors requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.
Supply support for MAX86141ENP+T 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, healthcare, and industrial markets.
The MAX86141ENP+T belongs to Analog Devices' wearable health sensor family, engineered specifically for ultra-low-power, high-accuracy optical biosensing in size- and battery-constrained devices - with emphasis on clinical-grade PPG performance in real-world ambient conditions.
FAQ
What is the primary function of the MAX86141ENP+T in a wearable health system?
The MAX86141ENP+T serves as a complete dual-channel optical data acquisition IC for photoplethysmography (PPG). It integrates LED drivers, photodiode signal conditioning, 19-bit ADCs, ambient light cancellation, and FIFO storage - enabling accurate, low-power SpO₂ and heart rate measurement in wristbands, earbuds, or finger clips. Its design eliminates the need for external analog front-end components while delivering clinical-grade performance.
Does the MAX86141ENP+T support simultaneous acquisition on both optical channels?
Yes, the MAX86141ENP+T supports true simultaneous dual-channel acquisition - unlike time-multiplexed alternatives. Each channel has its own dedicated 19-bit current-mode ADC, ambient cancellation path, and FIFO tagging, allowing concurrent red and IR PPG waveform capture without timing skew. This is essential for motion-robust ratiometric SpO₂ calculation and is explicitly confirmed in the device's detailed block diagram and electrical characteristics.
What are the absolute maximum ratings for VLED and VDD_ANA on the MAX86141ENP+T?
The MAX86141ENP+T specifies VLED = 3.1V to 5.5V (absolute max +6.0V), and VDD_ANA = 1.7V to 2.0V (absolute max +2.2V). Exceeding these violates Absolute Maximum Ratings and may cause permanent damage. These values are documented in the "Absolute Maximum Ratings" table on page 4 of the official datasheet, and must be respected in layout and power supply design.
How does the ambient light rejection work in the MAX86141ENP+T?
The MAX86141ENP+T employs a two-stage ambient light rejection system: analog ambient cancellation (ALC) subtracts DC and low-frequency ambient photocurrent before ADC conversion, while digital ambient cancellation filters residual 50/60Hz and transient interference in post-processing. This hybrid approach achieves >70dB rejection at 120Hz and tolerates >100μA DC ambient current - verified in the Electrical Characteristics table and Typical Operating Characteristics plots (toc03, toc04).
Can the MAX86141ENP+T drive more than three LEDs?
Yes - the MAX86141ENP+T's three LED drivers can control up to six LEDs using an external 3×2:1 analog multiplexer, as stated in the General Description. With two MAX86141ENP+T devices in controller-target mode, up to twelve LEDs are supported. This capability is enabled by the LED sequence control registers (0x20–0x22), which support commands like "LED4 (external mux control)" - confirming direct external mux coordination by the MAX86141ENP+T.
MAX86141ENP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Sensor Type:
- Oximeter/Heart Rate
- Output Type:
- SPI
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
MAX86141ENP+T FAQ
1.How can I place an order for MAX86141ENP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX86141ENP+T 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 MAX86141ENP+T reliable?
The price and inventory of MAX86141ENP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX86141ENP+T is usually 5 days.
3.What payment methods are accepted for MAX86141ENP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX86141ENP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX86141ENP+T?
MAX86141ENP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX86141ENP+T 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 MAX86141ENP+T?
For technical support, including MAX86141ENP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX86141ENP+T requirements.
6.How does Aetrix verify that MAX86141ENP+T is sourced from the original manufacturer or authorized distributors?
All MAX86141ENP+T 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 MAX86141ENP+T meets industry standards.
7.What is the process for return or replacement of MAX86141ENP+T?
All MAX86141ENP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX86141ENP+T, 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 MAX86141ENP+T part is unused and in its original packaging.
Return procedure for MAX86141ENP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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