Overview
An electrocardiogram measures the electrical activity of the heart through conducting electrodes placed in
contact with the skin. A conducting path is made through the heart and constitutes an ECG measuring
from right arm (RA) to left arm (LA). The ECG signal chain then filters, amplifies, and samples these
contact point voltages, and uses advanced differential signal processing techniques to derive a high-
quality ECG signal. The RLD electrode is used in this differential mode processing to provide a better
body bias voltage and reject common-mode noise.
Figure 25. ECG Channel Signal Chain
The ECG signal chain, shown in Figure 25, consists of an input MUX, ESD structure, EMI filtering, and an
input amplifier complete with an externally configurable HPF, fast-recovery mode, anti-aliasing filter
(AAF), programmable gain amplifier (PGA), and a delta-sigma ADC.
Associated Tabs
The tabs associated with ECG measurement are the PLL, ECG Channel, ECG Mux, ECG Lead Off, and
ECG RLD tabs. See their associated sections for a more detailed description of each available
configuration option.
Minimum Settings
The following settings satisfy the minimum requirements for collecting a raw ECG measurement. The rest
of the settings can be configured further but can be left at their power-on defaults.
ECG Channel: ‘ECG Enable’ checked (checking this box on one of the tabs checks all).
ECG MUX: Keep default settings.
ECG Lead Off: Keep default settings.
ECG RLD: ‘RLD Enable’ checked.
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