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could anybody send me sample code for reading counts from cs5532 adc
I would say that there is two important factors that should be tought about even before layout, and that is load impedance and bandwidth.
With high enough impedance, you get a wide-bandwidth radio receiver. And ADC circuit should never be built with Mohm or Gohm input impedance, if the kohm range is acceptable. Correct choice of the load impedance can diretly give 5 or 10 extra bits.
The next design choice to make is required upper bandwidth - if the input signal should be sent through a low-pass filter before being sampled. Besides solving problems with folding, it also affects amount of noise.