what chip should i use to have a lowpass filter

Discussion in 'General Electronics Chat' started by pinoyballer, Dec 1, 2007.

  1. pinoyballer

    Thread Starter Member

    Oct 31, 2007
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    FIlter out any signal higher than 100k Hz
     
  2. eeboy

    Active Member

    Sep 27, 2007
    90
    1
    What does the output feed?

    If you are feeding the input of an ADC (or another high impedance load) why not just use a RC filter configured as a low pass?
     
  3. nanovate

    Distinguished Member

    May 7, 2007
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  4. pinoyballer

    Thread Starter Member

    Oct 31, 2007
    11
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    im trying to feed it to a ADC converter. is there a chip that i can use?
     
  5. eeboy

    Active Member

    Sep 27, 2007
    90
    1
    No need for a chip in this situation.

    A 15.8k Ohm resistor in series with a 100pF cap shunted to ground will give you a cutoff frequency of 100kHz.
     
  6. pinoyballer

    Thread Starter Member

    Oct 31, 2007
    11
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    what order filter is this?
     
  7. pinoyballer

    Thread Starter Member

    Oct 31, 2007
    11
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    what kind of filter is this? and what order?
     
  8. eeboy

    Active Member

    Sep 27, 2007
    90
    1
    It's a first order low pass filter.
     
  9. MDK

    Member

    Feb 1, 2008
    22
    0
    You dont need a chip all you need is a resistor and a capacitor.

    This circuit will give ayou a cut off point of about 1K and a drop of about 3db per octave.
     
  10. Ron H

    AAC Fanatic!

    Apr 14, 2005
    7,050
    657
    That has a 3dB cutoff frequency of 284Hz, and drops at 6dB per octave.:rolleyes:
    Pinoyballer wants a 100kHz cutoff frequency, we think.
     
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