- Supports signal acquisition of up to 24 phases
- Flexible allocation of 6 LED, 4 PD in each PPG phase
- Synchronized PPG/ECG signal acquisition with each phase configurable as PPG or ECG, and at different data rates
- Synchronized PPG/ECG supports up to 1 kHz data rate
- ECG-only mode supports up to 4 kHz data rate
- PPG signal chain:
- 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
- PPG 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 6 LEDs for SpO2, HRM, or multi-wavelength HRM
- PPG Receiver:
- Supports 4 time-multiplexed photodiode inputs
- 2 parallel receivers to sample two PD channels simultaneously
- 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
- ECG Signal Chain
- 1-lead ECG with RLD output for bias
- INA gain programmable from 1.6 – 13
- <1 µVrms input noise (in a 1-150 Hz bandwidth) at 4-kHz sample rate
- Integrated 450 Hz Low Pass Filter
- AC, DC lead-off detect with 3.125-100 nA current and programmable interrupt
- 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
- I2C 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
- Supports operation with 2 supplies - 1.8 V, 5 V
- Supports signal acquisition of up to 24 phases
- Flexible allocation of 6 LED, 4 PD in each PPG phase
- Synchronized PPG/ECG signal acquisition with each phase configurable as PPG or ECG, and at different data rates
- Synchronized PPG/ECG supports up to 1 kHz data rate
- ECG-only mode supports up to 4 kHz data rate
- PPG signal chain:
- 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
- PPG 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 6 LEDs for SpO2, HRM, or multi-wavelength HRM
- PPG Receiver:
- Supports 4 time-multiplexed photodiode inputs
- 2 parallel receivers to sample two PD channels simultaneously
- 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
- ECG Signal Chain
- 1-lead ECG with RLD output for bias
- INA gain programmable from 1.6 – 13
- <1 µVrms input noise (in a 1-150 Hz bandwidth) at 4-kHz sample rate
- Integrated 450 Hz Low Pass Filter
- AC, DC lead-off detect with 3.125-100 nA current and programmable interrupt
- 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
- I2C 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
- Supports operation with 2 supplies - 1.8 V, 5 V
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