1 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

• 222 μA/channel while operating as 2-channel ECG

• Integrated Pace pulse detection on 1 channel

• Supports a 3-lead ECG, extendable to 5 leads or

higher by operating two or more AFEs in parallel

• PPG signal chain for SpO2, Heart rate and PTT

• ECG signal chain:

– Single channel ECG acquisition up to 2.048

kHz

– 2 channel ECG acquisition up to 1.36 kHz/

channel

– RLD output to set body bias through third

electrode

– Programmable INA gain from approximately 2

to 12

– >1 GΩ input impedance, CMRR > 100 dB

– Input noise (0.5-150 Hz): 13 μVpp at INA gain

of 3; 5 μVpp at INA gain of 12

– Integrated 370 Hz 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 over excitation

frequency from 30 kHz to 100 kHz

– Sine wave or square wave excitation

– Respiration impedance measurement: 45 mΩ-

pp noise on a baseline impedance of 2 kΩ

• Dual channel ECG channel:

– Bio-Z receiver configurable as a 2nd ECG

channel

• PPG Signal Chain

– Supports acquisition of up to 24 PPG signals

– Flexible allocation of 4 LED, 4 PD in each

phase

– 8-Bit LED Current control up to 250 mA

– Low noise current DAC at input to cancel DC

– Trans-impedance Gain: 3.7 kΩ to 1 MΩ

– Filter to reduce sensor’s optical noise

bandwidth

• External clock and internal oscillator modes

• FIFO with 128-sample Depth, 24-bit word

• SPITM, I2C interfaces: Selectable by pin

• 2.6-mm × 2.6-mm DSBGA, 0.4-mm Pitch

• Supplies: Rx:1.7-1.9 V, IO:1.7-1.9 V, Tx: 3.0-5.5 V

2 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

• SpO2 & Heart rate, and PTT-based blood pressure

through synchronized ECG, PPG

3 Description

The AFE4960P supports synchronized signal

acquisition of ECG, PPG and bio-impedance signals.

A PPG signal chain comprises of a current driver for

LEDs and a receiver that senses the signal from PDs.

The AFE 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. The AFE has AC and DC Lead biasing

and lead on/off detection. 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 AFE4960P can be used to realize a

3-lead ECG system along with SpO2.