Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Need help designing ADC system -

  1. Feb 24, 2006 #1
    Need help designing ADC system - URGENT!!!

    I have to design a system where an analog input is converted to a digital output which will be sent to a parallel digital data bus using a ADC chip.

    the specifications are that the input should be between 300-3200Hz with a digitisation error of 1%. for this do i use a band pass filter or a low pass only? how do you maintain under 1%? is it by choosing the number of bits?

    also, the sample rate is to be taken at 8kHz. but the the rates in the Chips are all very much higher than this. How do you control that?

    if a basic block diagram is to be drawn, should it be like this?

    analog input, filter, sample and hold, ADC, (timer?? to control the sampling rate??), (shift registers??? to convert from series to parallel??), digital data bus :confused:
     
  2. jcsd
  3. Feb 24, 2006 #2

    berkeman

    User Avatar

    Staff: Mentor

    What textbook are you learning about ADC systems from? A good source of information is the manufacturers who make the ADC chips. It's in their best interest to help you design a good circuit using their chips, so their Application Notes sections are usually full of great info and help.

    I checked out Analog Devices website, and they have a long list of helpful Application Notes:

    http://www.analog.com/en/DCcList/0,3090,760%5F%5F43,00.html

    Start with a basic one like AN-282, and then look for notes that may fit your device or system requirements.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Need help designing ADC system -
Loading...