AFE4500
- 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.
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開發板
AFE4500EVM — 適用於生物阻抗分析和生物感測的 AFE4500 整合式 AFE 評估模組
AFE4500 評估模組 (EVM) 旨在加速與 AFE4500 相關的評估及系統開發活動。AFE4500 支援光體積變化描記圖 (PPG)、心電圖 (ECG) 和人體阻抗分析 (BIA) 的同步訊號擷取。
三種訊號鏈的類比轉數位轉換器 (ADC) 輸出皆儲存在 256 取樣的先進先出 (FIFO) 區塊中，可利用序列周邊介面 (SPI) 或 I2C 介面讀取。晶片具有共用相同 ADC 的 PPG、ECG 和 Bio-Z 獨立訊號鏈。可定義獨立訊號擷取窗口來採集 PPG、ECG 和/或 Bio-Z 訊號。每個訊的採集速率皆可獨立設定。支援最多 24 個 PPG 訊號 (最多 (...)
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