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Texas Instruments AFE4960 Analog Front End (AFE)

Texas Instruments AFE4960 Analog Front End (AFE) can be configured as either a 2-channel ECG receiver, a 1-channel ECG receiver, or a respiration impedance channel. The AFE signal chains can interface in a flexible manner with 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 to measure 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 an SPI or an I²C interface. The Texas Instruments 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.

Features

Supports ECG and respiration impedance measurement; configurable as 2-channel ECG or 1-channel ECG + 1-channel respiration
Can be used in IEC 60601-2-47:2012/(R)2016 and IEC 60601-2-27:2011(R)2016 compliant systems
222µA/channel while operating as a two-channel ECG
Integrated Pace pulse detection on one channel
Supports a 3-lead ECG, extendable to 5 leads or higher by operating two or more AFEs in parallel
ECG signal chain
- Single-channel ECG acquisition up to 2.048kHz
- Two-channel ECG acquisition up to 1.36kHz/channel
- RLD output to set body bias through a third electrode
- Programmable INA gain from 2~12
- > 1GΩ input impedance, CMRR > 100dB
- Input noise (0.5-150Hz): 13µVpp at INA gain of 3; 5µVpp at INA gain of 12
- Integrated 370Hz anti-aliasing low pass filter
- Mode for Continuous lead on/off detection
- Mode for Lead impedance measurement

Bio-Z signal chain
- Measurement of Bio-impedance overexcitation frequency from 30kHz to 100kHz
- A sine wave or square wave excitation
- Respiration impedance measurement: 45mΩ-pp noise on a baseline impedance of 2kΩ
Dual-channel ECG channel
- Bio-Z receiver configurable as a 2nd ECG channel
External clock and internal oscillator modes
FIFO with 128-sample depth, 24-bit word
SPITM, I²C interfaces: selectable by pin
2.6mm × 2.6mm DSBGA, 0.4mm pitch
Supplies
- Rx: 1.7-1.9V
- IO: 1.7-1.9V

Applications

Wireless patches for in-patient and out-patient monitoring
Event monitors for arrhythmia detection
Hand-held ECG monitor

Portable multi-lead ECG
Patient vital sign monitoring: Holter, event, stress, and telemedicine

Texas Instruments AFE4960 Analog Front End (AFE)

Features

Applications

Functional Block Diagram

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