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<DIV><FONT face="MS Sans Serif" size=2>Coz o to, zrejme pocitaji s vyuzitim te
PWM-SigmaDelta na nejake vykonove rizeni, ne aby delali z toho vystupu AD
prevodnik, i kdyby tam nakrasno ty spravne spinace byly, tak budou poveseny na
dig. zem a dig napajeni toho procesoru a ne na referenci.</FONT></DIV>
<DIV><FONT face="MS Sans Serif" size=2>Jde o odpory tech fetu v otevrenem stavu,
nikoliv o nejaky namalovany odpor, ten by tam byl v teto funkci jaksi nanic
(i kdyz se ten pull-up realizuje ve skutecnosti take fetem, a vypina
se).</FONT></DIV>
<DIV><FONT face="MS Sans Serif" size=2>Presnost PWM,Sigma-Delta se da celkem
dobre odvodit z rusivych jevu, ktere tu uz padly, a to z velikosti nesymetrie
odporu sinacu a z casovych chyb pri spinani.</FONT></DIV>
<DIV><FONT face="MS Sans Serif" size=2>Myslim ale, ze pro vas bude pouziti
nejakeho ser. 16bit DA bude asi schudnejsi :o)</FONT></DIV>
<DIV><FONT face="MS Sans Serif" size=2></FONT> </DIV>
<DIV><FONT face="MS Sans Serif" size=2>Danhard</FONT></DIV>
<DIV><FONT face="MS Sans Serif" size=2></FONT> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=novotny.pp@atlas.cz href="mailto:novotny.pp@atlas.cz">Novotný
Pavel</A> </DIV>
<DIV><FONT face="MS Sans Serif" size=2></FONT><BR></DIV>
<DIV><FONT face=Arial size=2>Popravde mate pravdu, take jsem si vsiml obrazku
c.50 z ktereho je videt, ze na portu P2.x je pouze PULL-UP odpor a odpor
vuci zemi chybi, ale zaroven se v datasheetu vychloubaji jak lze PWM vystupy
vyuzit (prepnout do modu) cituji "Dual NRZ 16-Bit Signa-Delta DAC", bez
jedine poznamky o nutnosti pouzit externi logiku, az jsem si rikal,
jses blbej a neco ti unika...</FONT></DIV>
<DIV><FONT face=Arial size=2>Asi vypustim PWM a pouziji nejaky
externi DAC, napriklad AD5324, ona presnost u PWM DAC je stejne veci
zahadnou.</FONT></DIV></BLOCKQUOTE></BODY></HTML>