AFE44S30
- Supports signal acquisition of up to 24 phases
- Flexible allocation of 8 LED, 4 PD in each phase
- Simultaneous signal acquisition from different sensors at different data rates
- Accurate, continuous heart-rate monitoring:
- System SNR up to 108-dB at 16 µA PD current
- Low Current for Continuous Operation on a Wearable Device with a Typical Value: 15 µA for an LED, 20 µA for the Receiver
- Transmitter:
- Supports common anode LED configuration
- 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 8 LEDs for SpO2, HRM, or multi-wavelength HRM
- Receiver:
- Supports 4 Time-Multiplexed Photodiode Inputs
- 2 parallel receivers (two 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 5-bit per-phase control and 15.5-µA range
- Close to 100 dB ambient rejection up to 10 Hz
- Noise filtering with programmable bandwidth
- Transimpedance Gain: 3.7 kΩ to 1 MΩ
- Supports external clock and internal oscillator modes
- Option to acquire data synchronized with a system master clock
- Automatic cancellation of DC from ambient, LED
- FIFO with 128-sample depth
- SPI interface
- 2.6-mm × 2.1-mm DSBGA, 0.4-mm pitch
- Supplies: Rx: 1.7 V-1.9 V (LDO bypass); 1.9 V-3.6 V (LDO enabled), Tx: 3 V-5.5 V, IO: 1.7-3.6 V
The AFE44S30 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 eight switching light-emitting diodes (LEDs) and up to four photodiodes. Up to 24 signal phases can be defined and the signal can be acquired from each phase in a synchronized manner. The current from the photodiode is converted into voltage by the transimpedance amplifier (TIA) and digitized using an analog-to-digital converter (ADC). The ADC code can be stored in a 128-sample First in, First out (FIFO) block. The FIFO can be read out using a SPI interface. The AFE also has a fully-integrated LED driver with an 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.
자세한 정보
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기술 문서
| 유형 | 직함 | 날짜 | ||
|---|---|---|---|---|
| * | Data sheet | AFE44S30 Ultra-Small, Integrated AFE With FIFO for Multi-Sensor Wearable, Optical Heart-Rate Monitoring and Bio-Sensing datasheet | PDF | HTML | 2019/11/25 |
설계 및 개발
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AFE44S30EVM — FIFO 및 SPI 평가 모듈이 있는 웨어러블 광학 바이오센싱용 AFE4430 통합 AFE
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| 패키지 | 핀 | 다운로드 |
|---|---|---|
| DSBGA (YZ) | 30 | 옵션 보기 |
주문 및 품질
- RoHS
- REACH
- 디바이스 마킹
- 납 마감/볼 재질
- MSL 등급/피크 리플로우
- MTBF/FIT 예측
- 물질 성분
- 인증 요약
- 지속적인 신뢰성 모니터링
- 팹 위치
- 조립 위치
권장 제품에는 본 TI 제품과 관련된 매개 변수, 평가 모듈 또는 레퍼런스 디자인이 있을 수 있습니다.