AD5750 circuit

Hi!

I'm working on a project where I want to use the AD5750 to create the analog outputs transmitted through SPI.

I've created a schematic but I'm not positive I did everything right. Is the attached schematic going to work? Or is there some obvious mistake?

The CLK2,CS3,MISO2,MOSI2 are the SPI signals, REF is created by ADR392B, OUT0 is input from a DAC.

Thank you for your help,

Ondrej

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  • +1
    •  Analog Employees 
    on Nov 26, 2018 6:37 AM

    Hi Ondrej,

    Apologies for the late response. I have a few comments on the schematic.

    1. AVSS should be supplied with at least -12V based on the specification table.

    2. Add 10uF and 0.1uF bypass caps between AVDD/AVSS/DVCC and ground. Refer to the user guide for connections.

    3. You can remove R31 on the schematic. R32 can serve as the pull-up resistor. I would also recommend to use 10k ohms for the pull-up resistors for the digital outputs.

    Best regards,

    Rainier

Reply
  • +1
    •  Analog Employees 
    on Nov 26, 2018 6:37 AM

    Hi Ondrej,

    Apologies for the late response. I have a few comments on the schematic.

    1. AVSS should be supplied with at least -12V based on the specification table.

    2. Add 10uF and 0.1uF bypass caps between AVDD/AVSS/DVCC and ground. Refer to the user guide for connections.

    3. You can remove R31 on the schematic. R32 can serve as the pull-up resistor. I would also recommend to use 10k ohms for the pull-up resistors for the digital outputs.

    Best regards,

    Rainier

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