Clock generator for ADC0808

Discussion in 'Embedded Systems and Microcontrollers' started by FBorges22, Sep 11, 2008.

  1. FBorges22

    Thread Starter Active Member

    Sep 11, 2008
    104
    0
    Greetings,

    I am trying to build a circuit that have the ADC0808. However, I am having a little dificulty to build a circuit to generate a 1.2MHz clock signal for him.

    Could anyone help me to build a clock generator for him please?

    Thanks,
    Fborges22
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Looking at the data sheet seems to show that 1.2 MHz is pushing the old IC a bit hard. 640 KHz is more like the recommended frequency.

    There are ways to generate this clock (which is shown at 500 KHz in one data sheet example). One is to use the uC to do so, which is a pain. Or you can get a TTL oscillator in a 4 pin package. The available frequencies are never quite right, but you can always use a flip flop to lower the frequency by 2. Use 1.5 MHz and get 750 KHz, for instance.
     
  3. amolhshah

    Member

    Aug 12, 2008
    13
    1
  4. FBorges22

    Thread Starter Active Member

    Sep 11, 2008
    104
    0
    Using the microcontroller to generate the appropriate clock could be trick in my case. Because my uC kit have 22MHz of clock.
     
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