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AD7994 filter

The AD7992 AD7993 AD7994 AD7997 AD7998 have a bit D3 in the Configuration Register defined as FLTR, with a vague description that this filters the I2C bus.  What filtering does this bit enable? Where is this documented? 

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[edited by: @skowalik at 11:23 AM (GMT 0) on 5 Mar 2020]