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PCM1794 settling time

Sorin Nicu
Prodigy 20 points
Other Parts Discussed in Thread: NE5534, PCM1794

I am designing a DAC based the PCM1794. The data sheet shows in the I/V conversion stage an OpAmp (NE5534) and mentions that settling time affects quality of conversion. In the datasheed I cannot find the settling time of your DAC - in order to match it with an alternate OpAmp with higher slew rate/settling time.

What is the actual value for the settling time of a PCM1794?

  • 0
    Prodigy 20 points

    This is bogus...

    I did ask TI technical support about this and their reply was:

    "Thank you for your interest in Texas Instruments products and services.  We value your technical support request with Texas Instruments.

    Due to the nature of your inquiry, we recommend you use our TI E2E™ Community Support Forums where you can post questions, search for answers and collaborate with fellow engineers and TI experts.

    You can access the E2E
    forums through the following link: http://e2e.ti.com

    We appreciate your
    understanding and look forward to working with you in the future. We are
    continually improving our online community."

    Looks like nobody cares to answer this simple question. It is something to hide? Looking at PCM1794 datasheet - for fs=96kHz, max F=768fs=73.728MHz -> 1/F=13nS. In order to get a full swing, requires the 24 bit to be "turned". That, due to "advanced segment" architecture will take at least 12 periods, no? That makes some 162ns...

    Is that corrrect?

  • 0 in reply to Sorin Nicu
    TI__Guru**** 189401 points

    Hi, Sorin,

    I apologize for the delay here... It seems there was some system glitch, and we were not made aware of your post. I have reported this to our admins to see if they can figure out what happened.

    And, yes, we are transitioning support to this structure from the old email structure we used to use. We believe this is better for you since it gives you a repository of issues you can search thru, and hopefully find an answer faster than waiting on one of us to respond to your email.

    On to your question, it seems your math is spot on.

    -d2