ADS1298 - what are the benefits of using bipolar power supply?

Ilia Davidov (UA)

Other Parts Discussed in Thread: ADS1298

I'm newbee ADS1298 and now starting to evaluate it in order to build inexpensive PC-based ECG monitor.

Can anybody explain me, what are the benefits (if any) of using bipolar power supply? I'm going to power my project from USB-port of PC, so I already have +5V unipolar power. Is it enough just to filter the noise and use unipolar low-noise LDO to provide the power for ADS1298 or should I use something like described in AppNote (i.e. charge-pump invertor etc.)?

Thanks :)

over 15 years ago

0 Tom Hendrick over 15 years ago

TI__Guru**** 180831 points

Hi Ilia,

ECG signals are bipolar, roughly +/-5mV. The analog input of the ADS1298 is +/-Vref/GAIN, so with a bipolar supply, you would not need to apply any level shifting of the input signal. Take a look at the "Analog Front-End Design for ECG Systems..." application note, this should help you a little.

0 Ilia Davidov (UA) over 15 years ago in reply to Tom Hendrick

Prodigy 60 points

Hi Tom,

Thanks a lot for comprehensive answer.

Regards,

Ilia V. Davidov

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ADS1298 - what are the benefits of using bipolar power supply?