AFE49I30 Series
Ultra-low-power integrated AFE for wearable optical biosensing with FIFO, I2C and ECG
Manufacturer: Texas Instruments
Catalog
Ultra-low-power integrated AFE for wearable optical biosensing with FIFO, I2C and ECG
Key Features
• Supports signal acquisition of up to 24 phasesFlexible allocation of 6 LED, 4 PD in each PPG phaseSynchronized PPG/ECG signal acquisition with each phase configurable as PPG or ECG, and at different data ratesSynchronized PPG/ECG supports up to 1 kHz data rateECG-only mode supports up to 4 kHz data ratePPG signal chain:System SNR up to 108-dB at 16 µA PD currentLow current for continuous operation on a wearable device with a typical value: 15 µA for an LED, 20 µA for the receiverPPG Transmitter:Supports common anode LED configuration8-Bit programmable LED current with range adjustable from 25 mA to 250 mAMode to fire two LEDs in parallel with independent per-phase current controlProgrammable LED on-time per-phaseSimultaneous support of 6 LEDs for SpO2, HRM, or multi-wavelength HRMPPG Receiver:Supports 4 time-multiplexed photodiode inputs2 parallel receivers to sample two PD channels simultaneouslyIndividual ambient offset subtraction DAC at each TIA Input with 8-bit per-phase control and range adjustable up to 255-µAIndividual LED offset subtraction DAC at each TIA input with 5-bit per-phase control and15.5-µA rangeClose to 100 dB ambient rejection up to 10 HzNoise filtering with programmable bandwidthTransimpedance Gain: 3.7 kΩ to 1 MΩECG Signal Chain1-lead ECG with RLD output for biasINA gain programmable from 1.6 – 13<1 µVrms input noise (in a 1-150 Hz bandwidth) at 4-kHz sample rateIntegrated 450 Hz Low Pass FilterAC, DC lead-off detect with 3.125-100 nA current and programmable interruptSupports external clock and internal oscillator modesOption to acquire data synchronized with a system master clockAutomatic cancellation of DC from ambient, LEDFIFO with 128-sample depthI2C interface2.6-mm × 2.1-mm DSBGA, 0.4-mm pitchSupplies: 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 VSupports operation with 2 supplies - 1.8 V, 5 VSupports signal acquisition of up to 24 phasesFlexible allocation of 6 LED, 4 PD in each PPG phaseSynchronized PPG/ECG signal acquisition with each phase configurable as PPG or ECG, and at different data ratesSynchronized PPG/ECG supports up to 1 kHz data rateECG-only mode supports up to 4 kHz data ratePPG signal chain:System SNR up to 108-dB at 16 µA PD currentLow current for continuous operation on a wearable device with a typical value: 15 µA for an LED, 20 µA for the receiverPPG Transmitter:Supports common anode LED configuration8-Bit programmable LED current with range adjustable from 25 mA to 250 mAMode to fire two LEDs in parallel with independent per-phase current controlProgrammable LED on-time per-phaseSimultaneous support of 6 LEDs for SpO2, HRM, or multi-wavelength HRMPPG Receiver:Supports 4 time-multiplexed photodiode inputs2 parallel receivers to sample two PD channels simultaneouslyIndividual ambient offset subtraction DAC at each TIA Input with 8-bit per-phase control and range adjustable up to 255-µAIndividual LED offset subtraction DAC at each TIA input with 5-bit per-phase control and15.5-µA rangeClose to 100 dB ambient rejection up to 10 HzNoise filtering with programmable bandwidthTransimpedance Gain: 3.7 kΩ to 1 MΩECG Signal Chain1-lead ECG with RLD output for biasINA gain programmable from 1.6 – 13<1 µVrms input noise (in a 1-150 Hz bandwidth) at 4-kHz sample rateIntegrated 450 Hz Low Pass FilterAC, DC lead-off detect with 3.125-100 nA current and programmable interruptSupports external clock and internal oscillator modesOption to acquire data synchronized with a system master clockAutomatic cancellation of DC from ambient, LEDFIFO with 128-sample depthI2C interface2.6-mm × 2.1-mm DSBGA, 0.4-mm pitchSupplies: 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 VSupports operation with 2 supplies - 1.8 V, 5 V
Description
AI
The AFE49I30 is an analog front-end for optical bio-sensing/ PPG and ECG measurement applications. The device supports up to six switching light-emitting diodes (LEDs) and up to four photodiodes. Up to 24 signal phases can be defined and the PPG or ECG signals can be acquired from each phase in a synchronized manner.
The AFE49I30 is an analog front-end for optical bio-sensing/ PPG and ECG measurement applications. The device supports up to six switching light-emitting diodes (LEDs) and up to four photodiodes. Up to 24 signal phases can be defined and the PPG or ECG signals can be acquired from each phase in a synchronized manner.
