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Texas Instruments AFE4404 超小型集成模拟前端

德州仪器 AFE4404 是一款面向光学生物传感应用的超小型集成模拟前端（AFE），例如心率监测（HRM）和血氧饱和度（SpO2）测量。该器件支持三个开关发光二极管（LED）和一个光电二极管。光电二极管的电流通过互阻抗放大器（TIA）转换为电压，然后使用模数转换器（ADC）进行数字化。ADC 代码可使用 I2C 接口读出。该 AFE 还配有带 6 位电流控制的全集成 LED 驱动器。该器件具有宽动态范围的发送和接收电路，有助于感测超小信号电平。

特性

  • 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
    • 10kΩ to 2MΩ programmable trans-impedance gain
    • Dynamic power-saving mode to reduce current to less than 200µA
    • 10SPS to 1000SPS pulse frequency
    • Flexible pulse sequencing and timing control
    • Flexible Clock Options
      • 4MHz to 60MHz input clock external clocking
      • 4MHz oscillator internal clocking
    • I2C interface
    • -20°C to +70°C operating temperature range
    • 2.6mm × 1.6mm DSBGA package, 0.5mm pitch
    • Supplies
      • Rx: 2V to 3.6V
      • Tx: 3V to 5.25V
      • IO: 1.8V to 3.6V
  • Transmitter
    • Supports common anode LED configuration
    • 100dB dynamic range
    • 6-bit programmable LED current to 50mA (extendable to 100mA)
    • Programmable LED on-time
    • Simultaneous support of 3 LEDs for optimized SPO2, HRM, or multi-wavelength HRM

应用

  • Optical Heart-Rate Monitoring (HRM)
  • Heart-Rate Variability (HRV)
  • Pulse oximetry (SpO2 measurement)
  • VO2 max
  • Calorie expenditure

Additional Resources

Simplified Block Diagram

Texas Instruments AFE4404 超小型集成模拟前端

Related Development Tool

Texas Instruments 心率监测和脉搏血氧计评估套件

包含评估TI AFE4404器件所需的一切。

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发布日期: 2015-07-10 | 更新日期: 2023-11-01