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AFE4950

ACTIVE

Ultra-small integrated AFE for wearable optical heart-rate monitoring and SpO2

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Data sheet

AFE4950

ACTIVE
Data sheet Order now

Product details

Applications 1-lead ECG, BP, Dry electrode ECG, HRV, Optical-HRM, SpO2, Vo2 max Number of input channels 4 Resolution (bps) 22 Number of LEDs 8 Interface type I2C, SPI Operating temperature range (°C) -40 to 85 Rating Catalog
Applications 1-lead ECG, BP, Dry electrode ECG, HRV, Optical-HRM, SpO2, Vo2 max Number of input channels 4 Resolution (bps) 22 Number of LEDs 8 Interface type I2C, SPI Operating temperature range (°C) -40 to 85 Rating Catalog
DSBGA (YBG) 36 5.76 mm² 2.4 x 2.4
  • Supports simultaneous and synchronized acquisition of up to 24 PPG and a single-lead ECG signal.
  • Flexible allocation of 8 LED, 4 PD in each phase
  • ECG signal chain:
    • 1-lead ECG signal acquisition up to 2 kHz
    • RLD output to drive a third electrode
    • Input noise : 0.7 µV-rms
    • Supports up to ±0.65 V differential DC offset and +/-0.55 V common mode range
    • Programmable INA gain: 11, 21
    • High-pass filter with quick saturation recovery
    • Integrated 300 Hz anti-aliasing low pass filter
    • AC, DC lead-off detect: 2.9 nA to 92.5 nA
    • Low power continuous lead-on detection
  • Impedance signal chain
    • Continuous low-power monitoring of impedance between 2 electrodes
    • 7 MΩ range
    • 300 Ω noise on 620 kΩ
  • PPG Transmitter:
    • 8-Bit Programmable LED Current with range adjustable from 25 mA to 250 mA
    • Mode to fire two LEDs in parallel
    • Support of 8 LEDs in Common Anode configuration for SpO2, Multi-Wavelength HRM
  • PPG Receiver:
    • 2 parallel receivers (two sets of TIA/ filter)
    • Supports 4 Time-Multiplexed Photodiode Inputs to each Receiver
    • 8-bit Ambient Offset subtraction at each TIA input with 256 µA range
    • 8-bit LED Offset Subtraction DAC with 64 µA range
    • Automatic ambient cancellation and dynamic LED DC cancellation at TIA input
    • Ambient rejection close to 100 dB up to 10 Hz
    • Noise filtering with programmable bandwidth
    • Trans-impedance Gain: 3.7 kΩ to 1 MΩ
  • Accurate, Continuous Heart-Rate Monitoring:
    • System SNR up to 109-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
  • External clock and internal oscillator modes
  • Acquire data synchronized with system master clock
  • FIFO with 256-sample Depth
  • SPI, I2C interfaces: Selectable by pin
  • 2.6-mm × 2.5-mm DSBGA, 0.4-mm Pitch
  • Supplies: Rx:1.7-1.9V (LDO Bypass); 1.9-3.6V (LDO Enabled), Tx:3-5.5V, IO:1.7-RX_SUP
  • Supports simultaneous and synchronized acquisition of up to 24 PPG and a single-lead ECG signal.
  • Flexible allocation of 8 LED, 4 PD in each phase
  • ECG signal chain:
    • 1-lead ECG signal acquisition up to 2 kHz
    • RLD output to drive a third electrode
    • Input noise : 0.7 µV-rms
    • Supports up to ±0.65 V differential DC offset and +/-0.55 V common mode range
    • Programmable INA gain: 11, 21
    • High-pass filter with quick saturation recovery
    • Integrated 300 Hz anti-aliasing low pass filter
    • AC, DC lead-off detect: 2.9 nA to 92.5 nA
    • Low power continuous lead-on detection
  • Impedance signal chain
    • Continuous low-power monitoring of impedance between 2 electrodes
    • 7 MΩ range
    • 300 Ω noise on 620 kΩ
  • PPG Transmitter:
    • 8-Bit Programmable LED Current with range adjustable from 25 mA to 250 mA
    • Mode to fire two LEDs in parallel
    • Support of 8 LEDs in Common Anode configuration for SpO2, Multi-Wavelength HRM
  • PPG Receiver:
    • 2 parallel receivers (two sets of TIA/ filter)
    • Supports 4 Time-Multiplexed Photodiode Inputs to each Receiver
    • 8-bit Ambient Offset subtraction at each TIA input with 256 µA range
    • 8-bit LED Offset Subtraction DAC with 64 µA range
    • Automatic ambient cancellation and dynamic LED DC cancellation at TIA input
    • Ambient rejection close to 100 dB up to 10 Hz
    • Noise filtering with programmable bandwidth
    • Trans-impedance Gain: 3.7 kΩ to 1 MΩ
  • Accurate, Continuous Heart-Rate Monitoring:
    • System SNR up to 109-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
  • External clock and internal oscillator modes
  • Acquire data synchronized with system master clock
  • FIFO with 256-sample Depth
  • SPI, I2C interfaces: Selectable by pin
  • 2.6-mm × 2.5-mm DSBGA, 0.4-mm Pitch
  • Supplies: Rx:1.7-1.9V (LDO Bypass); 1.9-3.6V (LDO Enabled), Tx:3-5.5V, IO:1.7-RX_SUP

The AFE4950 device is an analog front-end (AFE) for synchronized signal acquisition of PPG and ECG signals. The device can also be used for optical bio-sensing applications, such as heart-rate monitoring (HRM) and saturation of peripheral capillary oxygen (SpO2). The ECG signal chain supports 2- and 3-electrode configurations and has an integrated Right leg drive (RLD) buffer. The ECG signal chain can also be used to do a continuous, low-power monitoring of the impedance between pair of electrodes.

The AFE4950 device is an analog front-end (AFE) for synchronized signal acquisition of PPG and ECG signals. The device can also be used for optical bio-sensing applications, such as heart-rate monitoring (HRM) and saturation of peripheral capillary oxygen (SpO2). The ECG signal chain supports 2- and 3-electrode configurations and has an integrated Right leg drive (RLD) buffer. The ECG signal chain can also be used to do a continuous, low-power monitoring of the impedance between pair of electrodes.
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Type Title Date
* Data sheet AFE4950 Ultra-Small, Integrated AFE for Wearable Optical Heart-Rate Monitoring, SpO2 and Electrical Bio-sensing datasheet (Rev. B) PDF | HTML 15 Jul 2021
Product overview ECG and Cuffless Blood Pressure Monitoring With Integrated AFE PDF | HTML 30 Oct 2023
Product overview Photoplethysmography (PPG) With Integrated AFE for Optical Biosensing PDF | HTML 30 Oct 2023
Application brief ECG Signal Acquisition on Wearables PDF | HTML 15 Nov 2022
Application brief Measuring Oxygen Saturation (SpO2) on Wearables PDF | HTML 14 Nov 2022
Application brief Optical Heart Rate Monitoring (OHRM) on Wearables PDF | HTML 14 Nov 2022
Application brief Cuffless Blood Pressure Monitoring on Wearables PDF | HTML 09 Nov 2022
Technical article Solving 5 challenges of ECG signal acquisition in wearables PDF | HTML 21 Jul 2021

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AFE4950EVM — AFE4950 evaluation module for ultra-small integrated AFE for wearable optical heart-rate monitoring

The AFE4950 evaluation module (EVM) is designed to expedite evaluation and system-development activities related to the AFE4950 product. AFE4950 is an analog front end (AFE) for synchronized signal acquisition of PPG and ECG signals. AFE4950 can also be used for optical biosensing applications, (...)

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HeartKey is a powerful and accurate set of ECG algorithms, ready for integration into the next generation low power low memory consumer / IoT & medical devices such as smartwatches, smart clothing, medical, automotive, smart home devices and hand-held devices. HeartKey is comprised of advanced (...)
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