AFE4404

활성

웨어러블, 광학 심박수 모니터링 및 생체 감지를 위한 초소형, 통합 AFE

지금 주문

데이터 시트

document-pdfAcrobat AFE4404 Ultra-Small, Integrated AFE for Wearable, Optical, Heart-Rate Monitoring and Bio-Sensing datasheet (Rev. D) (영어) PDF | HTML

AFE4404

활성

데이터 시트

지금 주문

제품 상세 정보

Applications

Clinical fingertip pulse oximetry, Hearables, Optical-HRM

Number of input channels

1

Resolution (Bits)

22

Number of LEDs

3

Interface type

I2C

Operating temperature range (°C)

-20 to 70

Rating

Catalog

Applications

Clinical fingertip pulse oximetry, Hearables, Optical-HRM

Number of input channels

1

Resolution (Bits)

22

Number of LEDs

3

Interface type

I2C

Operating temperature range (°C)

-20 to 70

Rating

Catalog

DSBGA (YZP)

15

4.8125 mm² 1.75 x 2.75

Transmitter:
- Supports Common Anode LED Configuration
- Dynamic Range: 100 dB
- 6-Bit Programmable LED Current to 50 mA (Extendable to 100 mA)
- Programmable LED On-Time
- Simultaneous Support of 3 LEDs for Optimized SPO2, HRM, or Multi-Wavelength HRM
Receiver:
- 24-Bit Representation of the Current Input from a Photodiode in Twos Complement Format
- Individual DC Offset Subtraction DAC at TIA Input for Each LED and Ambient Phase
- Digital Ambient Subtraction at ADC Output
- Programmable Transimpedance Gain:
  10 kΩ to 2 MΩ
- Dynamic Range: 100 dB
- Average Current Less Than 200 µA for PPG Signal Acquisition
Pulse Frequency: 10 SPS to 1000 SPS
Flexible Pulse Sequencing and Timing Control
Flexible Clock Options:
- External Clocking:
  4-MHz to 60-MHz Input Clock
- Internal Clocking: 4-MHz Oscillator
I²C Interface
Operating Temperature Range: –20°C to 70°C
2.6-mm × 1.6-mm DSBGA Package, 0.5-mm Pitch
Supplies: Rx: 2 V to 3.6 V, Tx: 3 V to 5.25 V,
IO: 1.8 V to 3.6 V

Transmitter:
- Supports Common Anode LED Configuration
- Dynamic Range: 100 dB
- 6-Bit Programmable LED Current to 50 mA (Extendable to 100 mA)
- Programmable LED On-Time
- Simultaneous Support of 3 LEDs for Optimized SPO2, HRM, or Multi-Wavelength HRM
Receiver:
- 24-Bit Representation of the Current Input from a Photodiode in Twos Complement Format
- Individual DC Offset Subtraction DAC at TIA Input for Each LED and Ambient Phase
- Digital Ambient Subtraction at ADC Output
- Programmable Transimpedance Gain:
  10 kΩ to 2 MΩ
- Dynamic Range: 100 dB
- Average Current Less Than 200 µA for PPG Signal Acquisition
Pulse Frequency: 10 SPS to 1000 SPS
Flexible Pulse Sequencing and Timing Control
Flexible Clock Options:
- External Clocking:
  4-MHz to 60-MHz Input Clock
- Internal Clocking: 4-MHz Oscillator
I²C Interface
Operating Temperature Range: –20°C to 70°C
2.6-mm × 1.6-mm DSBGA Package, 0.5-mm Pitch
Supplies: Rx: 2 V to 3.6 V, Tx: 3 V to 5.25 V,
IO: 1.8 V to 3.6 V

The AFE4404 is an analog front-end (AFE) for optical bio-sensing applications, such as heart-rate monitoring (HRM) and saturation of peripheral capillary oxygen (SpO2). The device supports three switching light-emitting diodes (LEDs) and a single photodiode. 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 read out using an I²C interface. The AFE also has a fully-integrated LED driver with a 6-bit current control. The device has a high dynamic range transmit and receive circuitry that helps with the sensing of very small signal levels.

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