DAC8775: DVDD power up sequences

Zoey Wu

Part Number: DAC8775

Tool/software:

hi team,

my customer is using DAC8775 and what will happen when we power DVDD after AVDD ? because the DVDD is gotten from the LDO supplied by AVDD.

I noticed that if DVDD applied first, it can reduce the output transients. Do u have some specific data? Thanks!

over 1 year ago

0 Lucas Burnette over 1 year ago

TI__Expert 4590 points

Hi Zoey,

Let me see if I can find some data for the transients.

Here is an older e2e thread that has a good explanation of them:
https://e2e.ti.com/support/data-converters-group/data-converters/f/data-converters-forum/808260/dac8775-dvdd-applied-after-avdd-and-pvdd_x

Thanks,
Lucas

0 Lucas Burnette over 1 year ago in reply to Lucas Burnette

TI__Expert 4590 points

Hi Zoey,

I was delayed with another project today, I will try to get a measurement to you on Monday next week.

Thanks,
Lucas

0 Lucas Burnette over 1 year ago in reply to Lucas Burnette

TI__Expert 4590 points

Hi Zoey,

I'm having trouble getting my EVM to generate a transient. Are you looking for a size/frequency estimate or a plot?

I did ask the testing team and they don't have any recorded data.

Thanks,
Lucas

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DAC8775: DVDD power up sequences