AFE4960中文资料适用于可穿戴设备光学心率监测和 SpO2 的超小型集成式生物传感 AFE数据手册TI规格书

描述 Description

The AFE4960 can be configured as either a 2-channel ECG receiver or as a 1-channel ECG receiver and a respiration impedance channel. The AFE signal chains can interface in a flexible manner to up to 4 electrodes. A right leg drive (RLD) amplifier output, can be used to set the body bias. The AFE has DC lead biasing for lead on/off detection, and AC lead biasing for measuring the lead impedance. Pacemaker pulse detection is supported on one channel.

All the signal chain outputs are converted by a single ADC in well-defined time slots and stored as 24-bit words in a 128-sample FIFO which can be read out using a SPI or an I2C interface.

The AFE4960 is a fully integrated solution to realize a 3-lead ECG system. Synchronized operation of two AFEs in parallel can be used to realize a 5-lead ECG.

特性 Features

• Supports ECG and respiration impedance measurement; configurable as 2-channel ECG or 1-channel ECG + 1-channel Respiration
• 222 µA/channel while operating as 2-channel ECG
• Supports a 3-lead ECG, extendable to 5 leads or higher by operating two or more AFEs in parallel
• Single channel ECG acquisition up to 2.048 kHz
• RLD output to set body bias through third electrode
• >1 GΩ input impedance, CMRR > 100 dB
• Integrated 370 Hz anti-aliasing low pass filter
• Mode for Lead impedance measurement
• Bio-Z signal chain:
• Sine wave or square wave excitation
• Dual channel ECG channel:
• External clock and internal oscillator modes
• SPITM, I2C interfaces: Selectable by pin
• Supplies: Rx:1.7-1.9 V, IO:1.7-1.9 V
• Additionally supports PPG signal acquisition for SpO2 and heart rate measurement
• 8-Bit LED Current control up to 250 mA
• Trans-impedance Gain: 3.7 kΩ to 1 MΩ; Filter to reduce sensor optical noise bandwidth