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DAC124S085/ Input capacitance

Kuramochi Tadahiko
Guru 28715 points

Hi,

Input capacitance is specified 3pF(max) on the datasheet.

Could you show me actual typical value and dispersion for our reference?

Best Regards,

Kuramochi

  • 0
    TI__Genius 16890 points
    Hello,

    Sorry, we do not have that information. It was not tested during the development characterization and is not tested during production.

    Mike
  • 0 in reply to Michael Stout
    Guru 28715 points
    Michael-san,

    Is the input capacitance tested actually?
    Or is this guaranteed by design?

    If it is design guarantee, could you tell me typical design value of input capacitance?

    Best Regards,
    Kuramochi
  • 0 in reply to Kuramochi Tadahiko
    TI__Genius 16890 points

    Hello,

    It is guaranteed by design and is not tested.  We do not have any typical information.  The typical value is not much though as the part is able to communicate up to 30MHz (max) with a typical number of 40MHz.  The capacitance for the part is from the package and the gate that is connected to the pin. 

    If they are worried about total capacitance, perhaps because of the number of parts connected to the SPI lines they should use the max number of 3MHz in their calculations.  They will probably have more capacitance from the layout (trace length, parallel traces, length of trraces) and cleanliness of the PCB than the capacitance from the DAC.

    Mike