A good PCB layout for the MAX3001EEUP+ involves keeping the analog and digital grounds separate, using a solid ground plane, and minimizing the distance between the MAX3001EEUP+ and the ECG electrodes. A 4-layer PCB with a dedicated analog ground plane is recommended.
To ensure EMI immunity, use a shielded cable for the ECG electrodes, keep the MAX3001EEUP+ 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.
Use a 10uF ceramic capacitor in parallel with a 100nF ceramic capacitor, both connected between the power supply pins (VCC and GND) of the MAX3001EEUP+. This helps to filter out high-frequency noise and ensure stable operation.
Calibration involves adjusting the gain and offset of the MAX3001EEUP+ to match the specific ECG electrode configuration and patient characteristics. Use a calibration signal source and adjust the gain and offset registers to achieve the desired signal quality and amplitude.
The maximum cable length for the ECG electrodes depends on the cable type and shielding. As a general rule, keep the cable length as short as possible (less than 1 meter) to minimize noise pickup and signal degradation. Use a shielded cable with a low capacitance (less than 100pF/m) for longer cable lengths.
MAX3001EEUP+ datasheet
by Maxim Integrated Products
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