Analog to digital converter confustion

[Kevin Sevcik]

Originally Posted by EricVanWyk

I have to respectfully disagree with you here Kevin. I have found the following 20MSPS 5V parts in 15 minutes of searching.

Originally Posted by Manoel

Erik,

It's not the supply range that's critical (as you pointed out, there are tons of 5 V parts), it's the analog input. With those specifications, it is really hard to find a suitable A/D.

Ditto Manoel. He was originally implying he wanted 5V p-p input range and said himself he could only find 2V p-p devices. No one makes them since few people want, need or try to directly sample RF signals without any buffer or filter circuitry. Thus all the devices out there expect a 2-3V p-p signal so the device designers don't have to trouble themselves compensating for voltage levels near the rails, making a difficult task even more so.