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michalt
Associate
September 9, 2016
Question

F4 Maximum DAC update rate

  • September 9, 2016
  • 2 replies
  • 688 views
Posted on September 09, 2016 at 09:55

Hello. Do you know what is a maximum DAC update rate for F446RE?

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    2 replies

    slimen
    Visitor II
    September 9, 2016
    Posted on September 09, 2016 at 11:07

    Hi,

    Max DAC Update rate is 1Msps, this is mentioned in the 

    http://www.st.com/content/ccc/resource/technical/document/datasheet/65/cb/75/50/53/d6/48/24/DM00141306.pdf/files/DM00141306.pdf/jcr:content/translations/en.DM00141306.pdf

     (page 150).

    Regards

    mark239955_stm1
    Visitor II
    September 9, 2016
    Posted on September 09, 2016 at 13:04

    For that 1Msps speed, the datasheet also notes ''Max frequency for a correct DAC_OUT change when small variation in the input code (from code i to i+1LSB)''

    Previous versions of the datasheet used to quote the maximum DAC sample rate as 300ksps, but my observations of the (F407) DAC were that it is more a question of the maximum slew rate that the DAC can achieve; iirc it appeared to be around 1V/us.