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DAC7553: Replacing 2 Digital Potentiometers and Necessary Pin Connections

Daniel Canales
Prodigy 10 points
Part Number: DAC7553

I'm trying to use the DAC7553 to replace the use of two Analog Devices AD5160. I realized I only need VDD, GND, PD_BAR, SCLK, SDIN, VOUTA and VOUT B. I don't really need the other connections. So, how should I connect the remaining non-necessary pins? Should I short any of them to ground? To VDD? Or leave them as not connected?

Thank you.

  • 0
    TI__Mastermind 46290 points
    Daniel,

    VOUTA, VDD, GND, VOUTB, VFBB, VREFB, SDO, IOVDD, SYNC, SCLK, SDIN, VREFA, and VFBA are all firmly required inputs in order to operate the device.

    The remaining 3 pins are PD, DCEN, and CLR whose utilization depends on your use cases. If you don't care to use these pins, they can be fixed to non-dynamic states (tied low/high etc.)

    If power-down mode is not used, the PD pin could be tied high. Whether it uses a pull-up resistor is up to you, including a pull-up will reduce current consumption on behalf of the digital pin.

    If daisy-chain is not used, the pin can be tied directly to ground.

    If CLR is not used, the pin can be tied high. Similar comments concerning pull-ups apply here as what I mentioned on the power-down pin.

    The thermal pad should be connected to ground.

    I hope this helps.