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ADS5474: Sequencing Requirements between 3V and 5V rails

Mitchell

Expert 4915 points

Part Number: ADS5474

Hi Team,

Just want to confirm - are there any sequencing requirements on the ADS5474 that we'd need to adhere to between the 5V (AVDD5) and 3.3V (AVDD3 & DVDD3) rails? I see that the datasheet calls out specific requirements to bring up the 3.3V rails together, but no mention if the 5V rail needs to come up first or last.

Thanks,
Mitchell

over 5 years ago

0 jim s over 5 years ago

TI__Guru* 91947 points

Mitchell,

We are looking into this.

Regards,

Jim

0 Mitchell over 5 years ago in reply to jim s

TI__Expert 4915 points

Thanks, Jim

0 jim s over 5 years ago

TI__Guru* 91947 points

Mitchell,

The only requirement is as follows:

1) Power up both AVDD3 and DVDD3 at the same time (best scenario), OR

2) Keep the voltage difference less than 0.8 V between AVDD3 and DVDD3 during the power up (0.8 V is not a

hard specification - a smaller delta between supplies is safer).

The 5V can be powered up at any time.

Regards,

Jim

0 Mitchell over 5 years ago in reply to jim s

TI__Expert 4915 points

Thanks!