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Part Number: ADS1298
Does anybody know what type of input protection diodes should be used in real-life ECG application? (picture from ADS1298RECGFE-PDK below as a reference)
I have tried with Schottky diodes, but I noticed some problems with lead-off detection. Not connected electrodes were detected as connected, probably because significant leakage current. So I guess that Schottky is not the best choice. What type of diodes should be used to have enough protection, but no problem with leakage current?
Thanks & regardsMaciej
I would say that it varies from application to application depending on requirements. You may need to consider using a TVS diode and/or adjusting some components to make the Schottky diodes work properly.
This video series should help: https://training.ti.com/eos-and-esd-adc?context=1139747-1140267-1128375-1139109-1137697
Alex SmithApplications Engineer | Precision Delta-Sigma Converters
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In reply to Alexander Smith:
Thank you for information. I will have a look on the video.
Do you know if there is any application note describing protection of ECG inputs and it's impact on lead-off detection?
In reply to Maciej Lasota:
Not that I know of unfortunately. The video series is pretty comprehensive, mostly working with SAR converters but most of the theory applies to delta-sigma converters as well.
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