--- Quote Start ---
So, can we say that ADC having maximum datarate 65 MSPS(mega sample per second) means it indirectly saying maximum frequency that it can support(here 65 MHZ)?
i.e. Data rate corresponds to frequency it supports. am i right??
--- Quote End ---
There's several terms you need to use when thinking about ADCs
1) Sampling rate
This is the rate at which the analog signal is sampled. It is also typically the same as the clock rate. However, some devices have internal PLLs that define the clock rate, and so the external clock rate is not the same as the sample rate.
2) Data rate
Some ADCs output data at the same rate as their sample rate. Higher frequency parts include demultiplexing, so output wider data buses at a lower rate than the sample rate. Other ADCs multiplex the samples onto serial data streams (JEDEC JESD204) so the output data rate is higher than the clock rate.
3) Analog bandwidth
Many ADCs are used for sampling a band of frequencies. That band of frequencies can lie in a Nyquist zone, where a zone is a band with bandwidth of under fs/2. For example, the first Nyquist zone is at DC to fs/2, the second is fs/2 to fs, and the third is fs to 3fs/2. These types of ADCs are called IF sampling or direct conversion ADCs. They save you a downconversion by using aliasing to get the signal to baseband.
Read the data sheet for your ADC board and the data sheet for the ADC IC on the board, and you'll find these terms, or terms very similar to this.
Cheers,
Dave
Honored Contributor
