lpc 2148 input signal frequency

Discussion in 'Embedded Systems and Microcontrollers' started by aniket433, Sep 15, 2013.

  1. aniket433

    Thread Starter New Member

    Oct 19, 2011
    3
    0
    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? :confused:

    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?
     
    Last edited: Sep 15, 2013
  2. embpic

    Member

    May 29, 2013
    187
    3
    yes 10 bit adc is more than sufficient if you doing for hobby purpose.
     
  3. Xkyve

    Member

    Nov 30, 2012
    32
    2
    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.
     
Loading...