2014-11-01 01:15 PM
Hello, I'm using a STA311b DSP in my actual Project and I'm wondering how the powersupply correction works? I couldn't find any details about this feature. How do I have to connect the ADC in this case? Do you have a sample shematic for this?
Thanks in advance, best regards Bernhard2014-11-05 11:29 PM
hi Bernhard,
regarding the power supply ripple correction feature , you need to use an ADC (left channel of stereo audio ADC) to sampling ripple level on the power supply rail for power stage , then fed data into STA311B SDI78 input , the data 7 will be used for ripple info . and you need to set PSC parameter for CNV and RCV accordingly. please pay attention for max ripple peak measurement , it should be measured when output is unclipping ( close to 1% THD) . Thanks2014-11-08 11:05 AM
Hello Zhao,
thank you for your fast reply. I will try this in the lab. You don't have a example for the configuration? Another question: The sta311b has a I2S recombination interface. What does it do? I never heard about such a Feature and the datasheet does not say very much about it. Can I use it to compare two I2S signals like a analog audio signal with a differential op amp to correct errors? Thanks2014-11-09 07:47 PM
hi Bernhard ,
yes we have example for this function , please find it attachment. the I2S recombination is a mixer with level detection , this feature was focusing on the high dynamic microphone application , due to microhpone was not easy to senselow level sound and without clipping with high level sound input , then different sensitivity input signal mixing can expend microphone recordingdynamic range withbetter SNR. it's not suitable for feedback application Thanks ________________ Attachments : Presentation1.pdf : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006Ht1o&d=%2Fa%2F0X0000000aJ2%2FANKpPQIj1maDPyVEJ7I0pIxsuEfImy6cKAZouBCL.Ns&asPdf=false2014-11-11 06:51 AM
2014-11-18 01:21 AM
Hi Bernhard ,
regarding the register calculation , please find detail in attachment . Thanks , ________________ Attachments : psc_calcualtion.pdf : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006Ht1t&d=%2Fa%2F0X0000000aJ3%2FC_yqD0w8_KbL25Vcs2Di2ttTOF.aUUjnKpSwI90nQvM&asPdf=false2014-11-19 07:14 AM
Hello,
thanks a lot you really helped me. I got it now :) Great feature!!2018-11-18 01:01 AM
Hello Mr. BernHard,
I have same question as Mr. Zhao. But where is the attachments? I cannot find it in your chat history. Can you please attach the example and register calculation again? or you can just send a email to me: lds330@126.com, thank you so much.
David.