A good PCB layout for the MAX3001EAUP+ involves keeping the analog and digital grounds separate, using a solid ground plane, and minimizing the distance between the MAX3001EAUP+ and the ECG electrodes. A 4-layer PCB with a dedicated analog ground plane is recommended.
To ensure EMI immunity with the MAX3001EAUP+, use a shielded cable for the ECG electrodes, keep the MAX3001EAUP+ away from high-frequency sources, and use a common-mode choke or ferrite bead on the power supply lines. Additionally, use a low-pass filter on the ECG signals to reject high-frequency noise.
A 10uF ceramic capacitor in parallel with a 100nF ceramic capacitor is recommended for power supply decoupling. Place these capacitors as close to the MAX3001EAUP+ power pins as possible.
To optimize the MAX3001EAUP+ for low-power operation, use the lowest possible clock frequency, disable the internal oscillator and use an external clock source, and use the shutdown mode when not in use. Additionally, consider using a lower supply voltage and reducing the analog gain.
A 3-lead or 5-lead ECG electrode configuration is recommended for the MAX3001EAUP+. Use a driven-right-leg (DRL) circuit to reduce common-mode noise and improve ECG signal quality.
MAX3001EAUP+ datasheet
by Maxim Integrated Products
