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DAC63204: About the 10kΩ pull-up resistor on the VREF pin

user6365974
Prodigy 220 points
Part Number: DAC63204

Tool/software:

1. The DAC63204 datasheet shows a 10kΩ pull-up resistor on the VREF pin, but is there any basis for this 10kΩ?

　Perhaps the purpose is to generate a delay to the VREF pin when powering on?

2. When using the internal reference, is there any significance to the 10kΩ pull-up resistor on the VREF pin and the bypass capacitor?

  • +1
    TI__Mastermind 42163 points

    Hello, 

    The 10k pullup recommendation is for when VREF is not used so that the pin is not floating (we generally do not recommend any input to be left floating), and the capacitor is only needed if you are using VREF as the reference. If you are using VREF as an external reference, then you do not need the pullup. You can connect it directly to whatever source you are using as the reference. 

    I have not noticed a performance difference with leaving the VREF pin floating as long as all channels are using either VDD or the internal reference as the reference.

    Best,

    Katlynne Jones

  • 0 in reply to Katlynne Jones
    Prodigy 220 points

    Understood, thanks for your reply.