ADC sampling rate

Discussion in 'The Projects Forum' started by sindhukrish, Mar 8, 2009.

  1. sindhukrish

    Thread Starter New Member

    Feb 24, 2009
    5
    0
    hello

    i am working n a project tat uses ADC. we use ADS7888 which has 1.25Msps .Does tat mean i can sample maximum of 600Khz?
    Also i would like to knw whether i can vary the sampling rate of this ADC..


    thank you..
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,348
    Hello,

    Yes, the maximum frequency you can sample is 600 kHz.
    Yes, the datarate can be changed by changing SCKL, the speed the data is send out also changes.

    Greetings,
    Bertus
     
  3. sindhukrish

    Thread Starter New Member

    Feb 24, 2009
    5
    0
    hello
    thank u..
    After reading the adc datasheet i found that by giving a sclk of 25mhz i can get the 1.5msps.
    pic mcu we can give a freq of 24mhz..will it be a problem to sample a 500khz signal??
     
  4. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    The maximum frequency of the signal has to be at least half the sampling frequency. However, this is a theoretical calculation and works in practise under certain conditions. If you want to achieve much accurate results use a sampling rate which is much greater than the sampled signal.
     
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