Looking at the datasheet for the TI ADS8671, it says this device can do 1 MSPS (one million samples per second, right?)
I would think this would allow sampling of theoretically up to 500 kHz, in practice a little less for the antialising filter.
But on page 25, it shows the frequency response of the integrated antialising filter well below that:
So for 1 MSPS I get a flat passband only up to 15 kHz? Can that be right?
Further confusing to me is this datasheet describes two ADCs, one with 1 MSPS and another 500 kSPS, yet describes only one filter. And it says the "filter is typically set to 15 kHz". Does "typically set" imply the filter is programmable? I see no such capability in the datasheet.
What am I missing?