4 bit adc ic

Discussion in 'General Electronics Chat' started by ajish alfred, Mar 30, 2009.

  1. ajish alfred

    Thread Starter New Member

    Mar 30, 2009
    hi ... i'm looking for a 4 bit adc ic that should not have a strobe or clock pin.if u know about such ics or cites which holds information , plese tell me
  2. AlexR

    Well-Known Member

    Jan 16, 2008
    I don't know if such a device exists.
    The ADC process takes a finite time so you need the strobe to tell the sample/hold circuit in the ADC when to sample the input and hold that value till the conversion is done.
    The conversion from analogue to digital needs to be controlled by some sort of clock so either the chip has to supplied with an external clock or it must generate its own internal clock.
  3. ajish alfred

    Thread Starter New Member

    Mar 30, 2009
    now i'm trying to design a 4 bit adc using op amps and resistors that can perform instantaneous convertion.
    i like that quote.........
  4. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    Why not use the 4 lowest bits on an 8-bit A-to-D chip? You just need to set the reference to give an appropriate span for the 1111 condition.
  5. beenthere

    Retired Moderator

    Apr 20, 2004
    You might look at an LN3914. There are more comparators than you need, but the output is immediate.