AFE4432
- 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.
추가 정보 요청
전체 데이터시트 및 기타 설계 리소스는 NDA에 따라 제공됩니다. 지금 요청
관심 가지실만한 유사 제품
다른 핀 출력을 지원하지만 비교 대상 장치와 동일한 기능.
기술 자료
| 상위 문서 | 유형 | 직함 | 형식 옵션 | 최신 영어 버전 다운로드 | 날짜 |
|---|---|---|---|---|---|
| * | 데이터 시트 | AFE4432 Ultra-Small, Integrated AFE for Optical Bio-Sensing datasheet | PDF | HTML | 2022. 8. 23 | |
| 애플리케이션 노트 | SPI Communication Issue in Wearable Application and Solution Using AFE4xxx in Smart Watch Applications | PDF | HTML | 2025. 12. 9 | ||
| Product overview | Photoplethysmography (PPG) With Integrated AFE for Optical Biosensing | PDF | HTML | 2023. 10. 30 | ||
| Application brief | Measuring Oxygen Saturation (SpO2) on Wearables | PDF | HTML | 2022. 11. 14 | ||
| Application brief | Optical Heart Rate Monitoring (OHRM) on Wearables | PDF | HTML | 2022. 11. 14 |
설계 및 개발
추가 조건 또는 필수 리소스는 사용 가능한 경우 아래 제목을 클릭하여 세부 정보 페이지를 확인하세요.
AFE4432EVM — 초소형, 초저전력, 높은 SNR, 통합 AFE를 위한 AFE4432 평가 모듈
AFE4432 평가 모듈(EVM)은 심박수 모니터링(HRM) 및 주변 모세혈관 산소포화도(SpO2)와 같은 광학 바이오센싱 애플리케이션을 위한 AFE(아날로그 프론트 엔드)인 AFE4432를 평가하기 위한 플랫폼입니다. AFE4432는 최대 4개의 스위칭 LED(발광 다이오드)와 최대 3개의 PD(포토다이오드)를 지원합니다. AFE에는 각각 8비트 전류를 제어하는 LED 드라이버가 2개 있습니다.
| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| DSBGA (YCH) | 25 | Ultra Librarian |
주문 및 품질
권장 제품에는 본 TI 제품과 관련된 매개 변수, 평가 모듈 또는 레퍼런스 디자인이 있을 수 있습니다.