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ADS1299-4: How should I wire redundant channels which aren't on the 4-channel chip, channels 5 - 8.

Faisal Almesfer
Prodigy 80 points
Part Number: ADS1299-4

Hi,

We are currently using the ADS1299-8 channel and have populated all 8 channel inputs using an RC circuit, as per the datasheet.

We would like to swap out the 8 channel with a 4 channel chip (ADS1299-4) and would like to know if we need to update our PCB layout.

1. Is it ok to have an RC circuit on pins IP5 - IP8?  An example of this circuitry is highlighted in yellow:

2. What's the recommended method of wiring IP5 - IP8 and IN5 - IN8 on the ADS1299-4?

Regards,

Faisal

  • 0
    TI__Expert 5745 points

    Hello Faisal, 

    I recommend tying the the unused input pins for the ADS1299-4 to AVSS. If they're connected to extra circuitry or GND, they'll be more likely to parasitically increase power consumption. Leaving the RC circuitry connected to those pins isn't going to be a problem, just not recommended. 

    Kind regards,
    Nick Z.