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ADS1298: RLD Output Circuit

Phil Wainman
Prodigy 80 points
Part Number: ADS1298

For the ADC input circuits I have included protection against Defrib and RF ablation signals - filters, protection diodes and high voltage resistors to dump the power.

Do I need to include similar components on the RLD output of the device?

The data sheet includes a 100kOhm patient protection resistor. Are there any particular requirements on this, eg voltage handling?

  • 0
    TI__Guru 66186 points

    Hi Phil,

    Thanks for your post.

    I believe the RLD electrode should be treated with similar, if not the same, protection as the other electrode inputs. The internal RLD amplifier's short-circuit current is only +/- 250 uA for normal operation. The Absolute Maximum voltage and current ratings still apply to avoid permanent damage to the RLD circuit.

    The 100k resistance shown in the datasheet is merely an example. It's expected that the customer properly designs the final protection circuitry based on the required standards. 

    I hope this helps.

    Best regards,