Topology selection of 12Bit 1MSpS SAR ADC for rail-to-rail input range

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swkimaz

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Guys,
I need to design 12Bit 1MSps SAR ADC with input having of 0~VDD range and 20KHz. Input will be coming from selection MUX. Can single-ended topology cover for this spec or should go with fully differential topology?

And if I pick fully differential topology, I need to single-to-differential converting for ADC input. Then it will be tough to design it for 0~VDD input range. Any good idea to design single-to-differential converting for 0~VDD input range?

Thanks
 

single ended structure will be enough. I have designed one.

if use single to differetial converter, you can set the gain low than 1 to release the output swing of it.
 

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