AFE4410
- Accurate, Continuous Heart-Rate Monitoring:
- Up to 100-dB Dynamic Range for Accurate Heart-Rate Detection
- Low Current for Continuous Operation on a Wearable Device With a Typical Value:
- 30 µA for an LED, 25 µA for the Receiver
- Transmitter:
- 4 LEDs in Common Anode Configurations
- 8-Bit Programmable LED Current to 200 mA
- Mode to Fire Two LEDs in Parallel
- Programmable LED On-Time
- Simultaneous Support of 3 LEDs for Optimized SpO2, HRM, or Multiwavelength HRM
- Average Current of 30 µA Adequate for a Typical Heart-Rate Monitoring Scenario:
- 20-mA Setting, 60-µs Pulse Duration,
25-Hz Sampling Rate
- 20-mA Setting, 60-µs Pulse Duration,
- Receiver:
- Supports 3 Time-Multiplexed PD Inputs
- 24-Bit Representation of Current Input From PD in Two’s-Complement Format
- Individual DC Offset Subtraction DAC
(Up to ±127-µA Range) at TIA Input for Each LED, Ambient - Digital Ambient Subtraction at ADC Output
- Transimpedance Gain: 10 kΩ to 2 MΩ
- Noise Filtering With Programmable Bandwidth
- Receiver Operates at Approximately 1-µA/Hz Sampling Rate (Example, 25 µA at 25 Hz)
- Hardware Power-Down Mode: Approximately 0-µA Current
- Flexible Pulse Sequencing and Timing Control
- Clocking Via External Clock or Internal Oscillator
- FIFO With 128-Sample Depth:
- Programmable Partitioning Across Phases
- Pin-Selectable I2C, SPI Interface
- Operating Temperature Range: –20°C to +70°C
- 2.6-mm × 2.1-mm, 0.4-mm Pitch DSBGA Package
- Supplies:
- Tx: 3 V to 5.25 V
- Rx: 1.8 V to 1.9 V (LDO Bypass),
2.0 V to 3.6 V (LDO Enabled) - IO: 1.7 V to Rx_SUP
TheAFE4410is an analog front-end for optical biosensing applications, such as heart rate monitoring (HRM). The device supports a maximum of four switching light-emitting diodes (LEDs) and a maximum of three photodiodes (PDs). The electrical 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 is stored in a 128-sample first-in, first-out block (FIFO) with programmable depth. The FIFO can be read out using either an I2C interface or a serial peripheral interface (SPI). The AFE also has a fully integrated LED driver with 8-bit current control. The device has high dynamic range transmit-and-receive circuitry offering a dynamic range of up to 100 dB that enables accurate heart ratesensing. The AFE achieves extremely low current levels by operating an ultralow power (ULP) mode set by using the ENABLE_ULP register bit.
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技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | AFE4410 Ultra-Small, Integrated AFE With FIFO for Wearable, Continuous Optical Heart-Rate Monitoring and Biosensing datasheet (Rev. B) | PDF | HTML | 2019年 7月 31日 |
| Technical article | Optical heart-rate sensors for biometric wearables | PDF | HTML | 2018年 5月 3日 |
設計與開發
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PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具
| 封裝 | 引腳 | 下載 |
|---|---|---|
| DSBGA (YZ) | 30 | 檢視選項 |
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