I am trying to interface an adc with an fpga, but I am running out of pins. I wanted to know if I use an ADC with a sampling rate same as the parallel one but with a serial interface , will I be compromising a lot with the speed ?
Sampling rate usually compose of conversion time + acquisition time. An ADC may have the same sampling rate for both parallel and serial interface but they usually would differ when reading the data. Parallel interface would be faster as all the data bits are output from the parallel output pins at the same time but when in serial mode interface it will take time as the data bits are clocked out in every clock cycle. So the time will depend on the clock frequency and the no. of bits or resolution.
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