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Si5351 + PIC16F1455 USB controller
Stigla mi i ova pločica za neke druge potrebe oko PTP/NTP servera sa Morion MV85 10MHz, polovan oscilator + nova pločica!
https://vi.aliexpress.com/item/1005003218394435.html

Pokušali su da "sakriju" od mene PLL IC pa su skinuli/obrisali oznaku ali mi je trebalo cca 10 minuta da nadjem tačan model, nije Si5351, drugi kolega sa 7 izlaza, iskoristili 3 ...

Uglavnom prvo oscilator radi vrlo lepo, sinus 10MHz i stabilan je ali je malo "zahtevan" jer mu treba vrlo stabilnih 5V za napajanje i 5V tj oko 4V za trim napon i ako se menja tih 5V onda se menja i frekvencija tako da MV85 zahteva malo više elektronike zbog stabilnih 5V dok na primer MV81 radi na 12V ali dodatnu u sebi ima vrlo stabilnu 5V referencu za potrebe trimovanja i sam rad oscilatora, 12V koriste za grejač, kod MV85 grejač je na 5V.

Pločica ima PLL i pravi od 10MHz sa OCXO 2 x 25MHz i jos jedan izlaz za 54MHz. Naravno PLL je programibilan i najlepše od svega je što ima EEPROM u sebi i može da se snime podešavanja tako da nije potreban dodatan MCU za kontrolu.

[Image: attachment.php?aid=40295]

Konkretno MV81 zajedno sa MV85, dva asinhrona clock izvora koja su tako podešena da se slika na osciloskopu ne pomera tj "stoji u mestu" i to je praktično 0ppm razlika Smile
Drugi oscilogram je sa izazlom od 25MHz preko PLL koji se isto "ne pomera".

Informativno, ako bi se ova dva signala razlikovala za na primer 0.1Hz na 10MHz to bi bila greška od 0.01ppm i jedan trag bi lagano "klizao" u jednu stranu tako da napravi jednu periodu za 10 sekundi, kada stoje tragovi onda su apsolutno iste frekvencije i sa osciloskopom se inače tako porede i podešavaju veoma precizno neke frekvencije, ne preko frekvencmetra, radi se ovako preko osciloskopa.

[Image: attachment.php?aid=40297]

[Image: attachment.php?aid=40298]


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Messages In This Thread
Si5351 + PIC16F1455 USB controller - by mikikg - 11-05-2014, 09:51 AM
RE: Si5351 + PIC16F1455 USB controller - by Gosha - 04-12-2016, 01:29 PM
RE: Si5351 + PIC16F1455 USB controller - by Gosha - 04-12-2016, 03:23 PM
RE: Si5351 + PIC16F1455 USB controller - by Gosha - 04-12-2016, 03:50 PM
RE: Si5351 + PIC16F1455 USB controller - by Gosha - 05-22-2017, 08:52 AM
RE: Si5351 + PIC16F1455 USB controller - by Gosha - 07-22-2017, 07:12 PM
RE: Si5351 + PIC16F1455 USB controller - by Gosha - 07-22-2017, 10:25 PM
RE: Si5351 + PIC16F1455 USB controller - by Gosha - 07-23-2017, 02:54 PM
RE: Si5351 + PIC16F1455 USB controller - by Gosha - 08-24-2017, 10:55 PM
RE: Si5351 + PIC16F1455 USB controller - by Gosha - 03-24-2023, 02:20 PM
RE: Si5351 + PIC16F1455 USB controller - by savan - 03-23-2023, 07:32 PM
RE: Si5351 + PIC16F1455 USB controller - by Gosha - 03-24-2023, 09:56 PM
RE: Si5351 + PIC16F1455 USB controller - by savan - 03-26-2023, 03:26 PM
RE: Si5351 + PIC16F1455 USB controller - by savan - 03-27-2023, 12:49 PM
RE: Si5351 + PIC16F1455 USB controller - by savan - 10-15-2023, 04:06 PM
RE: Si5351 + PIC16F1455 USB controller - by savan - 05-12-2023, 07:00 PM
RE: Si5351 + PIC16F1455 USB controller - by mikikg - 06-01-2023, 08:08 PM
RE: Si5351 + PIC16F1455 USB controller - by savan - 10-15-2023, 08:55 PM
RE: Si5351 + PIC16F1455 USB controller - by savan - 10-16-2023, 03:45 PM
RE: Upravo stiglo - by Khadgar2007 - 05-19-2017, 06:27 PM
RE: Upravo stiglo - by mikikg - 05-19-2017, 06:44 PM
RE: Upravo stiglo - by Khadgar2007 - 05-19-2017, 07:05 PM
RE: Upravo stiglo - by mikikg - 05-19-2017, 07:12 PM
RE: Upravo stiglo - by emiSAr - 05-19-2017, 07:41 PM
RE: Upravo stiglo - by mikikg - 05-19-2017, 09:57 PM
RE: Upravo stiglo - by Milan94 - 05-19-2017, 10:17 PM
RE: Upravo stiglo - by Gosha - 05-19-2017, 10:27 PM
RE: Upravo stiglo - by mikikg - 05-19-2017, 10:28 PM
RE: Upravo stiglo - by Milan94 - 05-19-2017, 10:33 PM
RE: Upravo stiglo - by Khadgar2007 - 05-19-2017, 10:38 PM
RE: Upravo stiglo - by mikikg - 05-19-2017, 10:41 PM
RE: Upravo stiglo - by Milan94 - 05-19-2017, 10:52 PM
RE: Upravo stiglo - by mikikg - 05-19-2017, 11:05 PM
RE: Upravo stiglo - by Khadgar2007 - 05-19-2017, 11:15 PM
RE: Upravo stiglo - by Milan94 - 05-19-2017, 11:24 PM
RE: Upravo stiglo - by mikikg - 05-19-2017, 11:44 PM
RE: Upravo stiglo - by Milan94 - 05-20-2017, 12:01 AM
RE: Upravo stiglo - by Khadgar2007 - 05-20-2017, 12:06 AM
RE: Upravo stiglo - by mikikg - 05-20-2017, 12:10 AM
RE: Upravo stiglo - by mikikg - 05-20-2017, 12:40 AM
RE: Upravo stiglo - by Khadgar2007 - 05-20-2017, 06:53 AM
RE: Upravo stiglo - by progster - 05-20-2017, 07:57 AM
RE: Upravo stiglo - by Khadgar2007 - 05-20-2017, 09:27 AM
RE: Upravo stiglo - by mikikg - 05-20-2017, 12:52 PM
RE: Upravo stiglo - by npejcic - 05-20-2017, 01:10 PM
RE: Upravo stiglo - by mikikg - 05-20-2017, 01:24 PM
RE: Upravo stiglo - by npejcic - 05-20-2017, 01:30 PM
RE: Upravo stiglo - by mikikg - 05-20-2017, 01:34 PM
RE: Upravo stiglo - by Khadgar2007 - 05-20-2017, 02:33 PM
RE: Upravo stiglo - by mikikg - 05-20-2017, 02:48 PM

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