參數(shù)資料
型號: EL4585CSZ-T7
廠商: INTERSIL CORP
元件分類: XO, clock
英文描述: Horizontal Genlock, 8FSC
中文描述: 36 MHz, VIDEO CLOCK GENERATOR, PDSO16
封裝: 0.150 INCH, ROHS COMPLIANT, SO-16
文件頁數(shù): 15/16頁
文件大?。?/td> 262K
代理商: EL4585CSZ-T7
EL4585C
Horizontal Genlock 8 FSC
Applications Information
Choosing External Components
1 To choose LC VCO components first pick the
desired operating frequency For our example
we will use 28636MHz with an H-sync fre-
quency of 15734kHz
2 Choose a reasonable inductor value (1-5
mH
works well) We choose 33
mH
3 Calculate CT needed to produce FOSC
FOSC e
1
2
q
0LCT
CTe
1
4
q2F2L
e
1
4
q2(28636e6)2(33e b 6)
e
94pF
4 From the varactor data sheet find CV
25V
the desired lock voltage CVe23pF for our
SMV1204-12 for example
5 C2 should be about 10CV
so we choose
C2e220pF for our example
6 Calculate C1 Since
CT e
C1C2CV
(C1C2) a (C1CV) a (C2CV)
then
C1 e
C2CTCV
(C2Cv) b (C2CT) b (CTCV)
For our example C1e17pF (A trim cap may be
used for fine tuning) Examples for each frequen-
cy using the internal divider follow
Typical LC VCO
4585 – 10
LC VCO Component Values (Approximate)
Frequency
L1
C1
C2
(MHz)
(mH)
(pF)
26602
33
22
220
270
33
21
220
295
27
22
220
35468
22
16
220
21476
47
26
220
24546
39
22
220
28636
33
17
220
Note
Use shielded inductors for optimum performance
Typical Xtal VCO
4585 – 11
8
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