dcic wrote on Feb 20th, 2013, 9:08pm:Once the sampling is done, DAC switching during conversion does not contribute to further thermal noise increasing.
Not correct. Switching elements in the DAC introduce noise. Voltage switches in a charge redistribution DAC have finite ON-resistance, which essentially generates thermal noise.
dcic wrote on Feb 20th, 2013, 9:08pm:Number of conversion cycles will depend on whether redundancy is implemented; if not, 8bit SAR takes 1cycle of sample + 8 cycles of conversion.
There are many possibilities here. It depends.