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AD9081 Recommended for New Designs
The AD9081 mixed signal front end (MxFEÂ®) is a highly integrated device with four 16-bit, 12 GSPS maximum sample rate, RF digital-to-analog converter...
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AD9081 on Analog.com

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AD9081 connecting DVDD1 and DVDD1_RT

youngpines

on Jul 15, 2022

Category: Datasheet/Specs

Product Number: AD9081

Software Version: N/A

I am designing the power tree for the AD9081, and there is a note on Pg 209 of the user guide (Rev0) that says this

I have other 1V rails not going to the AD9081 that I want to consolidate as much as possible. Which of the 2 rails is expected to have transient loads - DVDD1_RT or DVDD1? It's not clear what "it" is referring to in the highlighted sentence.

Also, how big is the current draw in these transients?

Tags: Datasheet/Specs mxfe AD9081 High Speed A/D Converters >10 MSPS Mixed-Signal Front Ends (MxFE) N/A Show More

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0 FormerMember

on Jul 15, 2022 10:04 AM

Hello,

DVDD1 draws the most current as shown in AD9081 power specification table and its transient load is based on the devices digital path configuration and clock rate. One can refer to UG-1578 for different use case scenarios showing power consumption for each case.

0 youngpines

on Jul 15, 2022 12:21 PM in reply to FormerMember

Hi ,

Thanks for the quick response. It sounded like the user guide was saying there'd be a fast and high transient current draw on either DVDD or DVDD_RT that would exceed the nominal or max loads shown in the user guide examples. Is this not the case and are the startup transients bounded to the max current consumption values listed in the examples in the user guide?

Also, is this startup transient load consumption only on DVDD and not on DVDD_RT?

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0 youngpines
on Jul 15, 2022 12:21 PM in reply to FormerMember
Hi ,

Thanks for the quick response. It sounded like the user guide was saying there'd be a fast and high transient current draw on either DVDD or DVDD_RT that would exceed the nominal or max loads shown in the user guide examples. Is this not the case and are the startup transients bounded to the max current consumption values listed in the examples in the user guide?

Also, is this startup transient load consumption only on DVDD and not on DVDD_RT?
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AD9081 connecting DVDD1 and DVDD1_RT