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ADS1299: internally sourced Ticks in BIAS signal

Part Number: ADS1299

Tool/software:

 Hi

Using the BIAS monitoring scheme we noted a repetitive disturbance in the shape of ticks in the BIAs signal

This phenomenon occurs regardless of applying any channel as derivative (also happens when no channels are selected, i/e/ DC_BIAS)

When channels were selected we shorted their inputs

Phenomenon also happen when device was floating (i.e. not connected to any input load or source)

The phenomenon stopped only when disabling the BIAS buffer 

It was unconditional of the BIAS_REF source

Pleased advise,

                         Ilan