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CDCM61001 crystal input connection

XIAOLIANG TAN
Prodigy 80 points
Other Parts Discussed in Thread: CDCM61001

Dear Experts,

       I am using the CDCM61001 as a clock generator. I read the datasheet, TI recommend three crystals. But unfortunately, I could not find the product based on the part no. 

      Since the CDCM61001 accepts single ended crystal input, but the normal crystal has two inputs and two grounds. So may I know that how do I connect the crystal to the CDCM61001? 

      Could I just use one input only and then connect another input to ground? 

      Thanks and happy new year.

  • 0
    TI__Mastermind 20900 points

    Hello Xiaoliang,

    a crystal is always a "2 port" device. So you have the 2 electrodes and the quartz stone in between. Many of the SMD packages have additional connections, which are used to ground the package.

    Anyway, the CDCM61001 has a special kind of crystal oscillator stage. It is called Collpits Oscillator. It used a positive feedback loop, which allows to connect just one electrode of the crystal. the other side is connected to ground.

    Best regards,

    Julian