LINEAR TECHNOLOGY LTC6909 3 Kanggo 8 Output Multiphase Oscillator karo SSFM
DESKRIPSI
Sirkuit demonstrasi 1446 nampilake osilator output multi-ple LTC6909 kanthi modulasi frekuensi spektrum nyebar (SSFM). LTC®6909 minangka osilator presisi sing gampang digunakake sing bisa nyedhiyakake output sinkronisasi 1-, 2-, 3-, 4-, 5-, 6-, 7- utawa 8-phase. Modulasi frekuensi spektrum nyebar LTC6909 (SSFM), bisa diaktifake kanggo nambah kinerja kompatibilitas elektromagnetik (EMC). Wolung output kapisah nyedhiyakake nganti wolung sinyal jam rel-kanggo-rel, 50% sinyal jam siklus tugas. Nggunakake telung input logika, output dikonfigurasi kanggo pamisahan fase, saka 45 ° nganti 120 ° (telung nganti wolung fase). Output jam uga bisa dicekel kurang utawa dikonfigurasi kanggo Hi-Z. Resistor tunggal (RSET) digabungake karo konfigurasi fase, nyetel frekuensi output, adhedhasar rumus ing ngisor iki:
FOUT = (20MHz x 10k)/(RSET x PH)
ngendi PH = 3, 4, 5, 6, 7 utawa 8
sawetara fOUT punika 12.5kHz kanggo 6.67MHz.
Input logika PH0, PH1 lan PH2 nemtokake mode operasi multi-phase LTC6909 lan ngontrol output kaya ing ngisor iki:
PH2 PH1 PH0 MODE
0 0 0 Kabeh Output Ngambang (Hi-Z)
0 0 1 Kabeh Output Dicekel Kurang
0 1 0 3-Mode Fase (PH = 3)
0 1 1 4-Mode Fase (PH = 4)
1 0 0 5-Mode Fase (PH = 5)
1 0 1 6-Mode Fase (PH = 6)
1 1 0 7-Mode Fase (PH = 7)
1 1 1 8-Mode Fase (PH = 8)
DC1446 ngemot LTC6909 lan terminal test kanggo wolung output. Ing papan jumper diwenehake kanggo nyetel input fase LTC6909 (PH0, PH1 lan PH2) lan modulasi SSFM. Ing Papan frekuensi setelan resis-tor (RSET) wis dimuat karo 100k lumahing gunung re-sistor (saliyane, loro receptacles pin kasedhiya kanggo nggunakake resistor RSET timbal).
Desain files kanggo papan sirkuit iki kasedhiya.
Telpon pabrik LTC. LTC, LT minangka merek dagang kadhaptar saka Linear Technology Corporation.
PROSEDUR Miwiti Cepet
Sirkuit demonstrasi 1446 gampang disiyapake lan dites. Deleng Gambar 1 kanggo persiyapan tes cepet lan tindakake prosedur ing ngisor iki:
- Selehake jumper ing posisi ing ngisor iki:
JP3 (PH0) kanggo V +, JP4 (PH1) kanggo V +, JP1 (PH2) kanggo V + lan JP1 (MOD) kanggo SSFM OFF. - 2. Setel sumber daya kanggo 5V.
- Nguripake sumber daya.
- Kanthi probe 10x disambungake menyang OUT1 oscilloscope kudu nuduhake 5V, 250kHz, squarewave (± 4.5%).
CEPAT START SET-UP 
CATETAN: Output 6909 (OUT1-OUT8) bisa nyopir beban 1k lan 50pF. Yen penganalisa spektrum digunakake kanggo ngukur bandwidth spektrum nyebar banjur gunakake probe impedansi dhuwur kanggo ngawasi output (biasane impedansi input saka analisa spektrum yaiku 50 ohm).
SIRKUIT DEMO 1446 PANDUAN MULAI CEPAT – LTC6909 3 TO 8 OUTPUT MULTIPHASE OSCILLATOR DENGAN SSFM 
DAFTAR PUSTAKA DC1446
Item Qty Referensi Bagian Katrangan Produsen / Part #
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 GANDA ROW HEADER SAMTEC, TMM104-02-LD
9 4 xJP1-xJP4 SHUNT, .079″ PUSAT SAMTEC, 2SN-BK-G
10 0 RSET(mbukak) Res., 0805
11 2 E13,E14 Pin, 0.057 bolongan Mill-Max, 8427-0-15-15-30-84-04-0
12 1 U1 IC., LTC6909CMS, MSOP-16 Linear Tech., LTC6909CMS
13 4 (STAND-OFF) STAND-OFF, NYLON 0.375″ KEYSTONE, 8832(SNAP ON)
Dokumen / Sumber Daya
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LINEAR TECHNOLOGY LTC6909 3 Kanggo 8 Output Multiphase Oscillator karo SSFM [pdf] Pandhuan pangguna LTC6909 3 Kanggo 8 Output Multiphase Oscillator karo SSFM, LTC6909, 3 Kanggo 8 Output Multiphase Oscillator karo SSFM |
