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Original question:

ADS1298ECGFE-PDK: Data not receive on channel

ADS1298ECGFE-PDK: Merits and Demerits of Uni-polar (+3V and 2.5V) and Bipolar (+3V and 2.5V) Supplies

Koustubh Joshi
Prodigy 240 points
Part Number: ADS1298ECGFE-PDK
Other Parts Discussed in Thread: ADS1298

Hello,

I have made a ADS1298 ECG board using ADS1298ECG evaluation kit but i found something wrong with my -2.5V supply i am trying to fix it with your reference design and the 1298 datasheet.

but currently i want to know the Merits and Demerits of Uni-polar (+3V and 2.5V)  and Bipolar (+3V and 2.5V) Supplies combinations with the given voltages?

what need to be Chang/ update in the software configurations?

How it affects the ECG graphs?

and recommended methods for supply combination.

Please help.

Thank You.

  • 0
    TI__Guru 55152 points

    Hi Koustubh,

    In terms of the device, there are no performance differences between the two setups. The advantage of bipolar supplies comes with the input common-mode range. Using bipolar supplies allows for one input to be connected to GND and the other signal can swing around this GND without violating the input common-mode. In a unipolar power supply configuration, one channel is typically tied to mid-supply, then the other signal can swing around this voltage. 

    The register settings for the device can remain the same.