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PGA2320 with a 3.3V logic supply

Andy Peters
Genius 3945 points

Subject says it all. 
Yes, the data sheet specifies the range for VD as +4.5V to +5.5V, but is there any reason why it can't work at +3.3V?  

Thanks !

  • 0
    TI__Guru**** 189399 points

    Andy,

    Wait, is this a trick question? :)

    I'm 99.7% sure that 3.3V is NOT supported, but I've asked the PGA guru to comment to remove that 0.3% doubt in my mind.

    -d2

  • 0 in reply to Don Dapkus
    TI__Guru**** 189399 points

    Andy,

    It might "work" but it won't meet the specs... So, if you can sacrifice some performance, maybe it will be ok. I'm sure Luis will chime in next week.

    -d2

  • 0 in reply to Don Dapkus
    TI__Guru 53436 points

    Hi Andy,

    The Switching timing characteristics are tested/characterized using the VD=5.0V supply; therefore we can only guarantee the correct working on the device using VD= 4.5 to 5.5V. The timing characteristics and logic levels are only guaranteed using the VD=4.5V-5.5V over all temperature, process and device variations.

    Best Regards,

    Luis

  • 0 in reply to Luis Chioye
    Genius 3945 points

    Luis Chioye said:
    The Switching timing characteristics are tested/characterized using the VD=5.0V supply; therefore we can only guarantee the correct working on the device using VD= 4.5 to 5.5V. The timing characteristics and logic levels are only guaranteed using the VD=4.5V-5.5V over all temperature, process and device variations.

    That's kinda what I expected; I just wanted a bit of verification. I suppose that I'll use a small switcher to give me 5V from my 15V (actually, pre-regulator so more like 18V) and then an LDO to get the 3.3V micro/etc supply. I wanted to just use a switcher to give me 3.3V from unregulated DC. Another dollar, I guess!