AFE4510
- Integrated signal chains for Bio-Z, EDA, ECG, PPG
- Synchronized ECG, PPG enables PTT-based BP
- Bio-Z signal acquisition:
- Multi-frequency Body impedance Analysis with frequency programmable up to 250kHz
- Low frequency excitation mode for EDA/GSR
- Complex (I, Q). Tetrapolar impedance measurement
- Sine-wave excitation with a 7-bit DAC
- Calibration scheme to compensate for electrode impedance and achieve accurate BioZ
- ECG signal acquisition:
- 1-lead ECG signal acquisition up to 4kHz
- Mode to configure as 2-channel ECG
- INA gain programmable from 1.27 - 12.23
- RLD output to set body bias through the third electrode
- Input noise (0.5-150Hz): 0.5µVrms at gain of 12.23
- >1GΩ input impedance, CMRR>100dB
- Integrated 370 Hz anti-aliasing low pass filter
- AC, DC lead-off detect: 1.6nA to 1µA
- PPG signal acquisition:
- Acquisition of 24 PPG signal sets (LED, AMB)
- Supports PPG sensors at different data rates
- Peak system SNR of 115 dB in 0.5-10Hz band enables high-accuracy SpO2 measurement
- Low Current for Continuous Operation with a Typical Value: 19µA for the Receiver
- PPG Transmitter:
- 8-Bit Programmable LED Current with a range adjustable from 50mA to 300mA
- LED Short Detection
- Support of 16 LEDs in Common Anode configuration for SpO2, OHRM, Spectroscopy
- PPG Receiver:
- Supports 5 PDs, 4 parallel receive paths
- Noise filtering with programmable bandwidth
- Trans-impedance Gain: 3.7kΩ to 1MΩ
- 8-bit Ambient Offset Subtraction DAC up to 256µA
- 9-bit LED Offset Subtraction DAC up to 64µA
- Digital Ambient Subtraction at ADC Output
- EDA Signal Acquisition:
- Low-power continuous EDA and PPG acquisition using the ECG receiver
- Independent data rates for EDA and PPG acquisition with optimized power cycling
- High-accuracy EDA signal chain for spot-check EDA using the BIA signal chain
- Supports external clock and internal oscillator
- Option to operate 2 AFEs in parallel
- Option to configure the 5th PD input as a general purpose voltage measurement channel
- FIFO with 384-sample Depth, SPI™
- Supplies: RX,:1.7-1.9V, I/O: 1.15-1.9V, TX:3-5.5V
The AFE4510 is a versatile signal acquisition system that supports acquiring PPG, EDA, ECG, and Bio-impedance signals. A PPG signal chain comprises a current driver for LEDs and a receiver that senses the signal from PDs. An ECG receiver with a Right-leg drive (RLD) can acquire a single-lead ECG from a pair of electrodes. An impedance measurement signal chain with integrated excitation & sense can be used for applications like BIA, EDA, and Impedance spectroscopy. The outputs of the various signal chains are digitized by a common ADC and stored in a FIFO which can be read out using an SPI interface
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檢視所有 1 | 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | AFE4510 Ultra Small, Integrated AFE for Bio Impedance Analysis, Electrical Bio Sensing & Optical Bio Sensing datasheet | PDF | HTML | 2024年 3月 21日 |
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