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PCM1808-Q1: power timing quesion

Qin zhiqiang
Prodigy 80 points
Part Number: PCM1808-Q1
Other Parts Discussed in Thread: PCM1808

Tool/software:

Hi TI teams,

    our project use PCM1808 as a analog to digital device, analog power supply is 5V power rail, digital power supply is 3,3V power rail, but i don't find any power timing in your datasheet, please provide this , thanks !

  • 0
    TI__Mastermind 30571 points

    Hello Qin,

    There is no power sequence  explicitly in the data sheet. However since  internal power-on-reset circuit monitors VDD to release the reset,  I would power on the VCC first  so when  VDD >2.2 (typical threshold) is met and internal reset is released I would see the output according to reset timing. 

    Regards,

    Arash

  • 0 in reply to Arash Loloee
    Prodigy 80 points

    Hi, TI teams, does this mean that if VDD power up first, there won't be any output until VCC power up ?　

    And if VDD power up first, VCC power up after, will this part still work properly?

  • +1 in reply to Qin zhiqiang
    TI__Mastermind 30571 points

    Hi Qin, 

    For functionality you need both VDD and VCC , but internal reset happens when VDD is above the mentioned threshold.  I would power up VCC and then VDD. If you power VCC after VDD still the part should function. 

    Regards,

    Arash