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About a relation between a supply voltage (+VD) of DAC902 and the output update rate.

Hiroaki Masumoto
Expert 1210 points
Other Parts Discussed in Thread: DAC902

Hi,

Our customer has a question about the DAC902.

The question is about a relation between a supply voltage (+VD) of DAC902 and the output update rate.
An analog supply voltage (+VA) uses +5V.

When using the output update rate in 200MSPS, is logic supply voltage (+VD) possible by +3V?
Or is +5V needed?


Best Regards,

Hiroaki Masumoto

  • 0
    TI__Guru* 91947 points

    Hiroaki,

    This is an old legacy Burr Brown device, and all of the designers have retired. Based on the Min value given in the data sheet with the supply between 2.7V and 3.3V, there is no guarantee this part will run above 125MSPS and achieve data sheet performance. Even with both supplies set to +5V, 200MSPS is not guaranteed.

     Also, keep in mind that all digital inputs are CMOS compatible. The logic thresholds depend on the applied digital supply voltage such that they are set to approximately half the supply voltage; Vth = +VD/2 (・}20% tolerance).

     

    Regards,

    Jim

  • 0 in reply to jim s
    Expert 1210 points

    Jim-san,

    Thank you for your reply.
    I understood and will inform our customer of your information.

    Regards,
    Hiroaki Masumoto