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DAC8568 - minimal connection

Pop Mircea Nicolae
Prodigy 110 points

Dear all,

If I power up DAC8568D with:

1. Ldac floating

2. 4.5V on AVdd

3. Gnd connected

4. Clr pulled up

5. other pins floating

should or should not all ouputs go to midscale?

By the way, please do reccomend a minimal testing connection!

Thanks!

  • 0
    TI__Genius 10615 points

    Hi Pop,

    Pop Mircea Nicolae said:
    should or should not all ouputs go to midscale?

    The internal reference for the DAC is disabled by default, so if the VREF pin is floating, you will not get a midscale output.

    If you do have a voltage applied at VREF with LDAC floating, it is really hard to tell what the output should be.

    Pop Mircea Nicolae said:
    By the way, please do reccomend a minimal testing connection!

    What do you mean by minimal testing connection?

  • 0 in reply to Eugenio Mejia
    Prodigy 110 points
    Dear Eugenio, Thank you for answering.
    It seems that I have to connect *LDAC.
    By minimal connection I mean something like in OP AMPS datasheets, when they connect the terminals and they collect all those characteristics. This DAC does not have a digital output, hence before starting to code the input lines, I would like to test its functionality. Hence I'd like to find out which is the minimal configuration, in order for the IC to behave in a known specific way that I can test. Hence, can you please tell me which connections are necessary to ensure in order to obtain the 2,5V output on all 8 analog outputs? Then I can start coding the inputs!

    Thank you for your most welcome reply!
  • 0 in reply to Pop Mircea Nicolae
    TI__Genius 10615 points

    If you use the setup below, your device should power on to a midscale of 2.5 V.

    • /SYNC - HIGH
    • SCLK - Don't care
    • DIN - Don't care
    • LDAC - LOW
    • GND - LOW
    • /CLR - HIGH
    • VREF - 2.5 V
    • AVDD - 5.0 V

  • 0 in reply to Eugenio Mejia
    Prodigy 110 points

    THANK YOU VERY MUCH, EXACTLY WHAT I NEEDED! REGARDS!