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Q&A

Comments on Powering a mixed signal board AVDD or DVDD for other IC's other than ADC

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Powering a mixed signal board AVDD or DVDD for other IC's other than ADC

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I have a circuit which reads from an electrochemical sensor IC. The block diagram of the circuit is given below.

Image_alt_text

It contains two voltage regulators for powering the AVDD and DVDD of the ADC.

From the electrochemical sensor IC, the output is connected to MUX and from MUX the signals are going to the ADC.

For 'RE' signal it is first going to a bufferthen it is going to MUX after that to ADC. ADC is controlled by an STM32 evaluation board.

My question is the MUX is a digital device but the I/P signal going to MUX is analog. Do I need to power MUX with AVDD or DVDD?

I can power buffer with AVDD becuse it is an anlog buffer. Please correct me if I am wrong.

Please see the datasheet of my components below.

ADC

MUX

BUFFER

LDO

History

2 comment threads

Confusion (4 comments)
Closed until sloppiness fixed. (8 comments)
Closed until sloppiness fixed.
Olin Lathrop‭ wrote 11 months ago · edited 11 months ago

You were told before to be more careful with your writing. For example, see https://electrical.codidact.com/posts/294691. You still haven't fixed several of the problems pointed out in a comment to that post. My patience has now run out. There will be no answer for you until you stop thumbing your nose at the volunteers here. I'll reopen this question after you fix it.

As pointed out before, there needs to be a space after periods and commas, and not one before.

Olin Lathrop‭ wrote 11 months ago

I see you edited the question, but you still haven't fixed the many places where a new sentence starts with no space after the period of the previous sentence. You also have not fixed the problems in your previous question 14 days after they were pointed out.

newbie‭ wrote 11 months ago

Sorry for the inconvenience caused.Updated both the questions

Olin Lathrop‭ wrote 11 months ago

You barely fixed anything. There are still multiple instances of no spaces after periods and commas for decimal points between the two questions.

newbie‭ wrote 11 months ago

I believe,I fixed all the issues

Olin Lathrop‭ wrote 11 months ago

You fixed the problems in this question, so I re-opened it.

However, you made the other question worse. You didn't fix the commas within numbers to be decimal points. Even worse, you added spaces after those erroneous commas and in the few places you had correct decimal points. It's hard to believe you are really that obtuse, so I can only conclude that you are trying to poke me and be as obstinate as possible. That's not a good strategy for getting free help from volunteers.

It took 2 days and 6 comments to get this far. I'm not going to waste that much effort in the future. Your questions will be closed and will stay that way until they adhere to the basic rules of English, including basic formatting. If that persists, I will consider stronger actions.

newbie‭ wrote 11 months ago

I’m really sorry if my previous edits caused frustration — I truly didn’t mean to come across as careless or disrespectful. I greatly value the time and help you’ve given me. I’m still learning how things work here, and some of the formatting errors were unintentional on my part. I’ll make sure to pay closer attention next time. Thank you for your patience and for guiding me through this process.

newbie‭ wrote 11 months ago

I completely corrected this question also.(https://electrical.codidact.com/posts/294691).

I promise that next time onwards I will review couple times before posting.I truly and sincerely apologize; it comes from the very bottom of my heart.