1 Features

• Supports signal acquisition of up to 16 phases
• Flexible allocation of LEDs and PDs in each phase
• Accurate, continuous heart-rate monitoring:
  • Up to 100-dB dynamic range
  • 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 50 mA to 200 mA
  • Mode to fire two LEDs in parallel
  • Programmable LED on-time
  • Simultaneous support of 4 LEDs for optimized SpO2, HRM, or multi-wavelength HRM
  • Programmable control signals to extend operation to 8 LEDs using external SPDT switches
• Receiver:
  • Supports 4 time-multiplexed photodiode inputs
  • Individual DC offset subtraction DAC at TIA input for each LED, ambient with 7-bit control and range up to ±254 µA
  • Transimpedance gain: 10 kΩ to 2 MΩ
  • Digital ambient subtraction at ADC output to suppress ambient tones
  • Noise filtering with programmable bandwidth
• Supports external clock and internal oscillator modes
• Automatic ambient cancellation mode (AACM) to increase receiver dynamic range
• Two programmable GPIO pins with flexible interrupt generation
• FIFO with 128-sample depth
• I²C, SPI interfaces: selectable by pin
• Operating temperature range: –40°C to +85°C
• 2.6-mm × 2.1-mm DSBGA, 0.4-mm pitch
• Supplies:
  • Rx:
    • 1.7 V to 1.9 V (LDO bypass)
    • 1.9 V to 3.6 V (LDO enabled)
  • Tx: 3 V to 5.5 V
  • IO: 1.7 V to RX_SUP