ADS1298 AC coupled input

Yarn Guo

Other Parts Discussed in Thread: ADS1298

Hi, Team:

If AC coupling at ADS1298 input is needed, could you help to give recommended baising resisor and caps values on our EVM?

Thank you for your prompt help.

Yarn

over 9 years ago

0 Brian Pisani over 9 years ago

TI__Mastermind 38745 points

Hello Yarn,

The lower end of the bandwidth for ECG to meet various medical electronics standards is 0.5 Hz. Combine that with the need for 10 MOhms of impedance at least between the patient and a power supply. That means I would set the resistors to 20 MOhms each (since in small signal analysis those resistors are in parellel - 20M || 20 M = 10 M). To get the bandwidth to 0.5 Hz with the 20 MOhm resistors, C has to be 32 nF.

Regards,
Brian Pisani

0 Yarn Guo over 9 years ago in reply to Brian Pisani

TI__Intellectual 1440 points

Thank you Brian for your detailed explanation. Got your point

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ADS1298 AC coupled input