LINEAR TECHNOLOGY LTC6909 3 To 8 Output Multiphase Oscillator ene-SSFM
DESCRIPTION
Isekethe ye-Demonstration 1446 ifaka i-oscillator ephumayo ye-LTC6909 ene-spread spectrum frequency modulation (SSFM). I-LTC®6909 iyi-oscillator enembayo elula yokusebenzisa enganikeza imiphumela evumelanisiwe yesigaba esingu-1-, 2-, 3-, 4-, 5-, 6-, 7- noma 8. I-LTC6909 spread spectrum frequency modulation (SSFM), inganikwa amandla ukuthuthukisa ukusebenza kwe-electromagnetic comppatibility (EMC). Okuphumayo okuyisishiyagalombili okuhlukene kunikeza amasiginali wewashi lewashi elingafika kuloliwe ayisishiyagalombili, 50%. Kusetshenziswa okokufaka okunengqondo okuthathu, okuphumayo kulungiselelwa ukuhlukaniswa kwesigaba, kusukela ku-45° ukuya ku-120° (izigaba ezintathu kuya kweziyisishiyagalombili). Okuphumayo kwewashi nakho kungabanjwa kuphansi noma kulungiselelwe i-Hi-Z. I-resistor eyodwa (i-RSET) ehlanganiswe nokucushwa kwesigaba, isetha imvamisa yokuphumayo, ngokusekelwe kufomula elandelayo:
FOUT = (20MHz x 10k)/(RSET x PH)
lapho PH = 3, 4, 5, 6, 7 noma 8
ububanzi be-FOUT ngu-12.5kHz ukuya ku-6.67MHz.
Okokufaka okunengqondo kwe-PH0, PH1 kanye ne-PH2 kuchaza imodi ye-LTC6909 yezigaba eziningi zokusebenza futhi kulawule ukuphuma kwayo ngale ndlela elandelayo:
PH2 PH1 PH0 IMODI
0 0 0 Yonke Imikhiqizo Iyantanta (Hi-Z)
0 0 1 Yonke Imiphumela Ibanjwe Phansi
0 1 0 Imodi yesigaba esi-3 (PH = 3)
0 1 1 Imodi yesigaba esi-4 (PH = 4)
1 0 0 Imodi yesigaba esi-5 (PH = 5)
1 0 1 Imodi yesigaba esi-6 (PH = 6)
1 1 0 Imodi yesigaba esi-7 (PH = 7)
1 1 1 8-Isigaba Semodi (PH = 8)
I-DC1446 iqukethe i-LTC6909 namatheminali okuhlola emiphumeleni eyisishiyagalombili. Kunikezwa ama-jumpers ebhodi ukuze kusethwe okokufaka kwesigaba se-LTC6909 (PH0, PH1 kanye ne-PH2) kanye nokushintshashintsha kwe-SSFM. I-on board frequency setting resis-tor (RSET) ilayishwe ngaphambilini ngesisitha sokukhweza esingaphezulu esingu-100k (ngaphezu kwalokho, kuhlinzekwa izithako zamaphini amabili ukuze kusetshenziswe isixhasi se-RSET esiholayo).
Idizayini files zaleli bhodi lesifunda ziyatholakala.
Shayela imboni ye-LTC. I-LTC, LT yizimpawu zokuthengisa ezibhalisiwe ze-Linear Technology Corporation.
INQUBO YOKUQALA NGOKUSHESHA
Isekethe yokubonisa i-1446 kulula ukuyimisa nokuhlola. Bheka Umfanekiso 1 ukuze uthole ukusetha okusheshayo kokuhlolwa futhi ulandele inqubo engezansi:
- Beka ama-jumper ezindaweni ezilandelayo:
I-JP3 (PH0) kuye ku-V+, JP4 (PH1) kuye ku-V+, JP1 (PH2) kuye ku-V+ ne-JP1 (MOD) kuye ku-SSFM OFF. - 2. Setha ukunikezwa kwamandla ku-5V.
- Vula ukunikezwa kwamandla.
- Nge-probe engu-10x exhunywe ku-OUT1 i-oscilloscope kufanele ibonise i-5V, 250kHz, i-squarewave (±4.5%).
UKUQALA OKUSHESHA UKUSETHA 
QAPHELA: Imiphumela ye-6909 (OUT1-OUT8) ingakwazi ukushayela imithwalo engu-1k no-50pF. Uma i-spectrum analyzer isetshenziselwa ukukala i-spectrum spectrum bandwidth bese usebenzisa i-impedance probe ephezulu ukuze uqaphe okuphumayo (imvamisa ukuthikamezeka kokufaka kwe-spectrum analyzer ngu-50 ohms).
I-DEMO CIRCUIT 1446 UMHLAHLANDLELA WOKUQALA OKUSHESHAYO – LTC6909 3 UKUYA 8 UKUPHUMA KWE-MULTIPHASE OSCILLATOR NGE-SSFM 
Izingxenye ze-DC1446
Into engu-Qty Reference Part Incazelo Umkhiqizi / Ingxenye #
1 1 C1 CAP., X7R, 10uF, 10V, 20% 1206 AVX, 1206ZC106MAT2A
2 2 C5,C2 CAP., X7R, 0.1uF, 16V, 10% 0402 TDK, C1005X7R1C104K
3 2 C3,C6 CAP., X5R, 1uF, 6.3V, 10% 0402 TDK, C1005X5R0J105K
4 1 C4 CAP., C0G, 1000pF, 25V, 5% 0402 TDK, C1005C0G1E102J
5 2 E1,E2 JACK, BANANA KEYSTONE, 575-4
6 10 E3-E12 TESTPOINT, TURRET, .094″ pbf MILL-MAX, 2501-2-00-80-00-00-07-0
7 3 JP1,JP3,JP4 3 PIN 0.079 SINGLE ROW HEADER SAMTEC, TMM103-02-LS
8 1 JP2 2X4, 0.079 DOUBLE ROW HEADER SAMTEC, TMM104-02-LD
9 4 xJP1-xJP4 SHUNT, .079″ CENTRE SAMTEC, 2SN-BK-G
10 0 RSET(open) Res., 0805
11 2 E13,E14 Pin, 0.057 hole Mill-Max, 8427-0-15-15-30-84-04-0
12 1 U1 IC., LTC6909CMS, MSOP-16 Linear Tech., LTC6909CMS
13 4 (IME-OFF) STAND-OFF, Inayiloni 0.375″ KEYSTONE, 8832(I-SNAP ON)
Amadokhumenti / Izinsiza
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LINEAR TECHNOLOGY LTC6909 3 To 8 Output Multiphase Oscillator ene-SSFM [pdf] Umhlahlandlela Womsebenzisi I-LTC6909 3 Ukuya kokungu-8 Oscillator Ophumayo we-Multiphase ene-SSFM, LTC6909, 3 To 8 Output Multiphase Oscillator ene-SSFM |
