Hello i trying to make oscilloscope using lpc 2148..

1)what would be the maximum 'digital signal' frequency i can apply at the inputs of lpc 2148 for proper processing?

2)As said in datasheet, for 10 bit ADC max sampling rate is 400 kSPS so what sampling rate should i take for proper regeneration of input 'analog signals' on display?
or
if i set the sampling rate at 400ksps what would be the max. analog signal frequency i can allow at the inputs of adc for proper regeneration?

 

yes 10 bit adc is more than sufficient if you doing for hobby purpose.

 

Nyquist sampling theorem can help you with that question. Basically, a signal can be reconstructed, if the sampling frequency is at least twice the signal frequency. So if you sample at a frequency of, say 400 kHz, you can reconstruct a signal with a maximum frequency of 200 kHz.

Hope it helps.