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HMC745 question

Dear Sir,

I have below questions for HMC745 need your help.

a. How much time for maximum propagation delay while input clock between 1~2GHz?

b. For out voltage swing , if customer set to 600mVp-p that means 0~600mVp-p or +/-300mV?

    and if customer hope to Vcom= 0.9V ( output swing 0.6V~1.2V) and how to do it ?

  • Hi,

    a. Propagation delay is almost constant for different clock frequencies.

    b. In the datasheet, the specified output swing is differential peak to peak. This means each if the part is set to 600mV, each output will have 300mVpp swing.

    If the customer wants to have common mode shifted to 900mV, than the supplies of the part should be shifted. Normally, common mode of HMC745 is around 3.1V. The part's supply can be shifted to 1.1V ~ -2.2V. 

    What is the interfacing part and its pull up resistor reference?

    Sinan

  • Hi Salemdar,

    Thanks for your feedback.

    a. Propagation delay is almost constant for different clock frequencies.

    -->Yes , we know it , so what is the propagation delay while clock at 1~2GHz.

         Could you provide the data of it?

    b

    b. In the datasheet, the specified output swing is differential peak to peak. This means each if the part is set to 600mV, each output will have 300mVpp swing.

    If the customer wants to have common mode shifted to 900mV, than the supplies of the part should be shifted. Normally, common mode of HMC745 is around 3.1V. The part's supply can be shifted to 1.1V ~ -2.2V. 

     -->This is useful to us for **** power supply to 1.1V~-.2.V ,tks!