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AFE4500

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Integrated analog front end (AFE) for bioimpedance analysis and electrical and optical biosensing

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Data sheet

AFE4500

ACTIVE
Data sheet Order now

Product details

Applications 1-lead ECG, Dry electrode ECG, Impedance spectroscopy, Optical-HRM Number of input channels 4 Resolution (Bits) 22 Number of LEDs 8 Interface type SPI, I2C Operating temperature range (°C) -40 to 85 Rating Catalog
Applications 1-lead ECG, Dry electrode ECG, Impedance spectroscopy, Optical-HRM Number of input channels 4 Resolution (Bits) 22 Number of LEDs 8 Interface type SPI, I2C Operating temperature range (°C) -40 to 85 Rating Catalog
DSBGA (YBG) 42 7.606386 mm² 2.997 x 2.538
  • Integrated signal chains for Bio-Z, EDA, ECG, PPG
  • Synchronized ECG, PPG enables PTT-based BP
  • Bio-Z signal chain
    • Multi-frequency Body impedance Analysis (BIA) with frequency programmable up to 250 kHz
    • Low frequency excitation mode for EDA/GSR
    • Complex (I,Q) Tetrapolar impedance measurement
    • Sine-wave excitation with a 7-bit DAC
    • Calibration scheme compensates for electrode impedance to achieve accurate Bio-Z
    • State machine for Automatic Calibration
  • ECG signal chain:
    • 1-lead ECG signal acquisition up to 2 kHz
    • INA gain programmable from 2-21
    • RLD output to set body bias through third electrode
    • Input noise (0.5-150 Hz): 0.75 µVrms at 1 kHz
    • ± 0.6 V differential DC offset and ± 0.3 V CM range
    • HPF with 0.4 Hz corner, quick saturation recovery
    • >1 GΩ input impedance, CMRR > 100 dB
    • Integrated 300 Hz anti-aliasing low pass filter
    • AC, DC lead-off detect: 1.6-nA to 100-nA
  • PPG signal chain
    • Supports acquisition of up to 24 PPG signals
    • Flexible allocation of 8 LED, 4 PD in each phase
    • Supports PPG sensors at different data rates
    • Optical loopback SNR of 100-dB, extendable to 110-dB with on-chip filtering
    • Low Current for Continuous Operation with a Typical Value: 15-µA for an LED, 15-µA for the Receiver
  • PPG Transmitter
    • 8-Bit Programmable LED Current with range adjustable from 25 mA to 250 mA
    • Programmable LED On-Time per-phase
    • Support of 8 LEDs in Common Anode
  • PPG Receiver
    • Supports 4 PDs, 2 parallel receive paths
    • Noise filtering with programmable bandwidth
    • Trans-impedance Gain: 3.7 kΩ to 1 MΩ
    • 8-bit Ambient Offset Subtraction DAC with range from16-256 µA
    • 8-bit LED Offset Subtraction DAC with range from 32 to 64 µA
    • Automatic ambient & LED DC cancellation
    • Supports external clock and internal oscillator modes
    • FIFO with 256-sample Depth
    • SPITM, I2C interfaces: Selectable by pin
    • Supplies: Rx:1.7-1.9V (LDO Bypass); 1.9 V to -3.6 V (LDO Enabled), Tx: 3 V to 5.5 V, IO:1.7-RX_SUP
  • Integrated signal chains for Bio-Z, EDA, ECG, PPG
  • Synchronized ECG, PPG enables PTT-based BP
  • Bio-Z signal chain
    • Multi-frequency Body impedance Analysis (BIA) with frequency programmable up to 250 kHz
    • Low frequency excitation mode for EDA/GSR
    • Complex (I,Q) Tetrapolar impedance measurement
    • Sine-wave excitation with a 7-bit DAC
    • Calibration scheme compensates for electrode impedance to achieve accurate Bio-Z
    • State machine for Automatic Calibration
  • ECG signal chain:
    • 1-lead ECG signal acquisition up to 2 kHz
    • INA gain programmable from 2-21
    • RLD output to set body bias through third electrode
    • Input noise (0.5-150 Hz): 0.75 µVrms at 1 kHz
    • ± 0.6 V differential DC offset and ± 0.3 V CM range
    • HPF with 0.4 Hz corner, quick saturation recovery
    • >1 GΩ input impedance, CMRR > 100 dB
    • Integrated 300 Hz anti-aliasing low pass filter
    • AC, DC lead-off detect: 1.6-nA to 100-nA
  • PPG signal chain
    • Supports acquisition of up to 24 PPG signals
    • Flexible allocation of 8 LED, 4 PD in each phase
    • Supports PPG sensors at different data rates
    • Optical loopback SNR of 100-dB, extendable to 110-dB with on-chip filtering
    • Low Current for Continuous Operation with a Typical Value: 15-µA for an LED, 15-µA for the Receiver
  • PPG Transmitter
    • 8-Bit Programmable LED Current with range adjustable from 25 mA to 250 mA
    • Programmable LED On-Time per-phase
    • Support of 8 LEDs in Common Anode
  • PPG Receiver
    • Supports 4 PDs, 2 parallel receive paths
    • Noise filtering with programmable bandwidth
    • Trans-impedance Gain: 3.7 kΩ to 1 MΩ
    • 8-bit Ambient Offset Subtraction DAC with range from16-256 µA
    • 8-bit LED Offset Subtraction DAC with range from 32 to 64 µA
    • Automatic ambient & LED DC cancellation
    • Supports external clock and internal oscillator modes
    • FIFO with 256-sample Depth
    • SPITM, I2C interfaces: Selectable by pin
    • Supplies: Rx:1.7-1.9V (LDO Bypass); 1.9 V to -3.6 V (LDO Enabled), Tx: 3 V to 5.5 V, IO:1.7-RX_SUP

The AFE4500 is a versatile signal acquisition system that supports three signal chains. An impedance measurement signal chain with integrated excitation and sense can be used for applications like Bio-impedance analysis (BIA), Electro-dermal analysis (EDA) and Impedance spectroscopy.

The AFE4500 is a versatile signal acquisition system that supports three signal chains. An impedance measurement signal chain with integrated excitation and sense can be used for applications like Bio-impedance analysis (BIA), Electro-dermal analysis (EDA) and Impedance spectroscopy.
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Type Title Date
* Data sheet AFE4500 Ultra-Small, Integrated AFE for Bio-Impedance Analysis, Electrical Bio-sensing and Optical Bio-sensing datasheet PDF | HTML 07 Apr 2021
Product overview Bioimpedance (Bio-Z) Applications Using Integrated Analog Front End (AFE) PDF | HTML 30 Oct 2023
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
Application brief Body Composition Measurement (BCM) for Wearables PDF | HTML 07 Nov 2022
Application brief Electrodermal Activity (EDA) for Wearable Devices PDF | HTML 06 Sep 2022

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Evaluation board

AFE4500EVM — AFE4500 integrated AFE for bioimpedance analysis and biosensing evaluation module

The AFE4500 evaluation module (EVM) is designed to expedite evaluation and system-development activities related to the AFE4500. AFE4500 supports synchronized signal acquisition for photoplethysmogram (PPG), electrocardiogram (ECG), and body impedance analysis (BIA).

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