NI-6733 Higher analog output rate for a given time

[romainGB]

Hello,

I am using the NI-6733 card for analog output and i am currently trying to figure if it's possible to go to a higher output rate that the one specified (Max update rate is 1MS/s) for a short amount of time. For example going to 10MS/s for 10 us and then going back to 1MS/s. Is it possible to do or is there something physically limiting the update rate? I am working with labwindows/CVI.

For what i understand the update rate is the rate at which a sample is read from the FIFO buffer and converted from digital to analog. The frequency at which this will append is defined by the AO sample clock. The internal clock is at 20MHz so i should be able to go up to 20MS/s, or am i missing something?  

Best regards,
Romain  

[Kevin_Price · Accepted solution]

No, you're missing something.  20 MHz is the timebase that's used to *derive* sample clocks by dividing down.

Sample rate specs are generally driven by the capability of the board's circuitry.   You won't be able to request an internally-derived sample clock higher than the spec -- the driver won't allow it.  And you won't be able to exceed that rate (at least not significantly) with an external clock without the board noticing and throwing a fault/error condition.

-Kevin P

[romainGB]

Thank you for your answer, it's more clear now and i can see why i was getting confused !

Romain G.