NV is "non-volatile", so it won't lose its content when the power goes off. SRAM is static, as opposed to dynamic.Static RAM cells are bigger than DRAM (dynamic) cells, so densities are lower, but they don't need to be refreshed.
so basically i need a SRAM or DRAM
and what about the word length.
Quoteso basically i need a SRAM or DRAMNo it is SRAM, because DRAM needs to be refreshed every few millisecond or so. This involves cycling through all the addresses in a special access mode. It means a whole lot of extra electronics in addition to the memory chip. Quoteand what about the word length.Most memory is organized as 1 or 8 bytes wide. As you need 12 bits your choice is either to use two bytes and waste a nibble, or put two samples into three bytes. That is efficient in terms of memory usasge but takes a bit of logic to fish out the samples from the bytes.