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數據轉換器
整合式與特殊功能資料轉換器
醫療 AFE
生物感測 AFE

AFE4432

現行

適用於具有 FIFO 之穿戴式光學生物感測的超小型、超低功耗、高 SNR 的整合式 AFE

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產品規格表

AFE4432

現行
產品規格表 立即訂購

產品詳細資料

Applications HRV, Hearables, Optical-HRM for wearables, SpO2, Vo2 max Number of input channels 3 Resolution (Bits) 22 Number of LEDs 4 Interface type I2C, SPI Operating temperature range (°C) -40 to 85 Rating Catalog
Applications HRV, Hearables, Optical-HRM for wearables, SpO2, Vo2 max Number of input channels 3 Resolution (Bits) 22 Number of LEDs 4 Interface type I2C, SPI Operating temperature range (°C) -40 to 85 Rating Catalog
DSBGA (YCH) 25 3.0625 mm² 1.75 x 1.75
  • Supports signal acquisition of up to 12 phase sets
  • Supports up to 4 LEDs, 3 PDs
  • Flexible allocation of LEDs, PDs in each phase
  • Simultaneous signal acquisition from different sensors at different data rates
  • Accurate, continuous PPG monitoring:
    • Low current for continuous heart-rate monitoring on a wearable device with a typical value: 12 µA for the receiver
    • Peak system SNR of 115 dB in 0.5-10 Hz band enables high-accuracy SpO2 measurement
  • Transmitter:
    • 8-Bit Programmable LED current with range adjustable from 25 mA to 250 mA
    • Mode to fire two LEDs in parallel with independent per-phase current control
    • Programmable LED on-time per-phase
    • Simultaneous support of 4 LEDs for SpO2, Multi-Wavelength HRM
  • Receiver:
    • Supports 3 Time-Multiplexed PD Inputs
    • 2 parallel receivers (2 sets of TIA/filter)
    • Individual ambient offset subtraction DAC at each TIA Input with 8-bit per-phase control and range adjustable up to 255-µA
    • Individual LED offset subtraction DAC at each TIA input with 9-bit per-phase control and 64-µA range
    • Digital ambient subtraction at ADC output
    • Noise filtering with programmable bandwidth
    • Transimpedance gain: 3.7 kΩ to 1 MΩ
  • Supports external clock or internal oscillator
  • Option to acquire data synchronized with a system clock
  • Automatic cancellation of DC from Ambient, LED
  • FIFO with 160-sample depth
  • SPI™ interface/ I2C interface
  • 1.9-mm × 1.8-mm DSBGA, 0.35-mm Pitch
  • Supplies: Rx:1.7 - 1.9 V, Tx: 3-5.5 V
  • Supports signal acquisition of up to 12 phase sets
  • Supports up to 4 LEDs, 3 PDs
  • Flexible allocation of LEDs, PDs in each phase
  • Simultaneous signal acquisition from different sensors at different data rates
  • Accurate, continuous PPG monitoring:
    • Low current for continuous heart-rate monitoring on a wearable device with a typical value: 12 µA for the receiver
    • Peak system SNR of 115 dB in 0.5-10 Hz band enables high-accuracy SpO2 measurement
  • Transmitter:
    • 8-Bit Programmable LED current with range adjustable from 25 mA to 250 mA
    • Mode to fire two LEDs in parallel with independent per-phase current control
    • Programmable LED on-time per-phase
    • Simultaneous support of 4 LEDs for SpO2, Multi-Wavelength HRM
  • Receiver:
    • Supports 3 Time-Multiplexed PD Inputs
    • 2 parallel receivers (2 sets of TIA/filter)
    • Individual ambient offset subtraction DAC at each TIA Input with 8-bit per-phase control and range adjustable up to 255-µA
    • Individual LED offset subtraction DAC at each TIA input with 9-bit per-phase control and 64-µA range
    • Digital ambient subtraction at ADC output
    • Noise filtering with programmable bandwidth
    • Transimpedance gain: 3.7 kΩ to 1 MΩ
  • Supports external clock or internal oscillator
  • Option to acquire data synchronized with a system clock
  • Automatic cancellation of DC from Ambient, LED
  • FIFO with 160-sample depth
  • SPI™ interface/ I2C interface
  • 1.9-mm × 1.8-mm DSBGA, 0.35-mm Pitch
  • Supplies: Rx:1.7 - 1.9 V, Tx: 3-5.5 V

The AFE4432 is an analog front-end for optical bio-sensing applications, such as heart-rate monitoring (HRM) and saturation of peripheral capillary oxygen (SpO2). The device supports up to 4 switching light-emitting diodes (LEDs) and up to three photodiodes (PDs). The AFE has two LED drivers each with 8-bit current control. The device has a high dynamic range transmit-and-receive circuitry that helps with the sensing of very small signal levels. Up to 12 signal phase sets can be defined, each phase set comprising a combination of LED and Ambient phases. Low noise offset DACs at the receiver inputs can be automatically controlled to cancel DC from Ambient and LED light. The current from the PDs in each phase is converted into voltage by TIAs, filtered, and then digitized using a common ADC. The ADC code can be stored in a 160-sample FIFO block. The FIFO can be read out using a SPI or I2C interface.

The AFE4432 is an analog front-end for optical bio-sensing applications, such as heart-rate monitoring (HRM) and saturation of peripheral capillary oxygen (SpO2). The device supports up to 4 switching light-emitting diodes (LEDs) and up to three photodiodes (PDs). The AFE has two LED drivers each with 8-bit current control. The device has a high dynamic range transmit-and-receive circuitry that helps with the sensing of very small signal levels. Up to 12 signal phase sets can be defined, each phase set comprising a combination of LED and Ambient phases. Low noise offset DACs at the receiver inputs can be automatically controlled to cancel DC from Ambient and LED light. The current from the PDs in each phase is converted into voltage by TIAs, filtered, and then digitized using a common ADC. The ADC code can be stored in a 160-sample FIFO block. The FIFO can be read out using a SPI or I2C interface.

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類型 標題 日期
* Data sheet AFE4432 Ultra-Small, Integrated AFE for Optical Bio-Sensing datasheet PDF | HTML 2022年 8月 23日
Application note SPI Communication Issue in Wearable Application and Solution Using AFE4xxx in Smart Watch Applications PDF | HTML 2025年 12月 9日
Product overview Photoplethysmography (PPG) With Integrated AFE for Optical Biosensing PDF | HTML 2023年 10月 30日
Application brief Measuring Oxygen Saturation (SpO2) on Wearables PDF | HTML 2022年 11月 14日
Application brief Optical Heart Rate Monitoring (OHRM) on Wearables PDF | HTML 2022年 11月 14日

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開發板

AFE4432EVM — 適用於超小型、超低功耗、高 SNR、整合式 AFE 的 AFE4432 評估模組

AFE4432 評估模組 (EVM) 是評估 AFE4432 的平台，此為光學生物感測應用領域的類比前端 (AFE)，如心率監控 (HRM) 與周邊微血管氧飽和度 (SpO2)。AFE4432 支援多達四個切換發光二極體 (LED) 和多達三個光電二極體 (PD)。AFE 配備兩個具 8 位元電流控制功能的 LED 驅動器。

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驅動程式或資料庫

AFE4432-DESIGN — AFE4432 design files for high-performance smallest-size PPG AFE for hearables and wearables

The full data sheet and other design resources for this device are available here.
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產品
生物感測 AFE
  • AFE4432 — 適用於具有 FIFO 之穿戴式光學生物感測的超小型、超低功耗、高 SNR 的整合式 AFE
硬體開發
開發板
  • AFE4432EVM — 適用於超小型、超低功耗、高 SNR、整合式 AFE 的 AFE4432 評估模組
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DSBGA (YCH) 25 Ultra Librarian
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