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ADS8328: What is the reference IC I can use for this?

Ashokraj PIlli
Prodigy 10 points
Part Number: ADS8328
Other Parts Discussed in Thread: REF3425,

Hi, 

         I am using the part :ADS8328. In my design we are having 2.8V rail. I would like to know whether can I use REF3425 to provide a reference voltage to my ADS8328?  I am more concerned of the power consumption and voltage drop of 0.3(2.8-2.5)

If not REF3425, Please suggest any other IC. 

https://www.ti.com/product/ADS8328?keyMatch=ADS8328&tisearch=search-everything&usecase=GPN

https://www.ti.com/product/REF3425?keyMatch=REF3425&tisearch=search-everything&usecase=GPN

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Thanks,

Ashok

  • 0
    TI__Guru 62786 points

    Hello Ashok,

    Welcome to our forum and thank you for your post!

    It looks like the REF3425 would be fine with 300 mV of dropout voltage. The only restriction I see is that this device cannot support the full 10-mA output current load on its own at 125C with less than 400 mV VDO.

    The average load current for the reference pin is around 25-45 uA depending on the reference input impedance. There will be spikes of instantaneous current drawn from the REF+ pin during the ADC conversion phase, but this is partially handled by adding decoupling capacitors across the reference pins and, therefore, should not be a concern. The data sheet recommends using 10 uF, but I would also advocate for an additional 0.01 uF in parallel placed closest to the ADC. 

    Best regards,

    Ryan