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AD9833 Waveform Generator

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AD9833 Waveform Generator
mikikg Offline
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#21
10-01-2018, 08:39 AM (This post was last modified: 10-01-2018, 08:50 AM by mikikg.)
Da li moze da se menja negde u programu baza sa clock, da se stavi da bude recimo 26MHz ili 27MHz?

Imam takve male kristale ali za 27MHz (od Si5351) a imam i isto tako malecke TCXO na 26MHz (1.8V) ako hoces da probas njih da ugradis?

https://forum.yu3ma.net/thread-700-post-...l#pid72283
https://forum.yu3ma.net/thread-700-post-...l#pid58441
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gorankg Offline
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#22
10-01-2018, 09:26 AM
Ne možeš da ideš preko 25MHz kod AD9833. Baci pogled na datasheet strana 4 tabela 2.
Tačnije, može ali nemaš garanciju da će se i ponašati kako treba.
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mikikg Offline
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#23
10-01-2018, 09:47 AM
Valja probati, mislim da ce to raditi OK, 25MHz = 40ns perioda, za 26MHz bi bila 38.4ns perioda, mala je to razlika, samo da moze u programu da se to prepravi jer jepotreban drugi odnos deljenja.
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gorankg Offline
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#24
10-01-2018, 11:19 AM (This post was last modified: 10-01-2018, 11:39 AM by gorankg.)
Može da se proba. Jednačina za frekvenciju izlaznog signala je:

f = (delta) Phase * fMCLK / 2 na 28.
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Dragan83 Offline
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#25
10-01-2018, 02:10 PM
Ja sam preturio sve od elektronike sto sam imao da probam da nadjem taj mali smd 25mhz al ga nisam nasao imam samo ove velike a oni su veci od same plocice na kojoj je AD cip, sto se tice nasih prodavnica ni tu ga nisam nasao kansije cu jos da kopam po netu da vidim imali ga gde .
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Dragan83 Offline
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#26
10-01-2018, 02:54 PM
Nasao sam smd 24MHz ali je malo veci od onog njegovog fabrickog.
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Dragan83 Offline
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#27
10-02-2018, 06:29 PM (This post was last modified: 10-02-2018, 07:55 PM by Dragan83.)
Generator je dobio kutiju, malo lepse izgleda spolja nego unutra al sta je tu je, poceo sam da se igram  sa prepravljanjem programa: boje, velicine slova, pocetna frekvencija  itd.  videcemo na sta ce na kraju da lici Smile .


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Bocko Offline
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#28
10-02-2018, 07:50 PM
Liči, liči i samo neka se koristi! Smile
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Dragan83 Offline
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#29
10-02-2018, 08:55 PM (This post was last modified: 10-02-2018, 08:59 PM by Dragan83.)
(10-01-2018, 09:47 AM)mikikg Wrote: Valja probati, mislim da ce to raditi OK, 25MHz = 40ns perioda, za 26MHz bi bila 38.4ns perioda, mala je to razlika, samo da moze u programu da se to prepravi jer jepotreban drugi odnos deljenja.

Probao sam da stavim ovaj mali smd kristal oscilator sto sam nasao na nekoj ploci i samo u programu prepravio frekvenciju na 24mhz i radi bez problema, radi i kad neprepravim frekvenciju ali onda laze u merenju.

const float refFreq = 24000000.0;           // On-board crystal reference frequency


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Dragan83 Offline
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#30
10-07-2018, 06:56 AM
Evo i malo igranja sa programom da bude DSS varijanta Smile


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mikikg Offline
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#31
10-07-2018, 08:17 AM
Hehe, super ti to napreduje, savladao si sve delove sad mozes da se igras kako hoces.
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