參數(shù)資料
型號(hào): EL4584CSZ-EVAL
廠商: Intersil
文件頁(yè)數(shù): 15/15頁(yè)
文件大?。?/td> 0K
描述: EVALUATION BOARD FOR EL4584
標(biāo)準(zhǔn)包裝: 1
主要目的: 計(jì)時(shí),PLL
嵌入式:
已用 IC / 零件: EL4584CSZ
主要屬性: 適用于高達(dá) 36 MHz 的視頻
次要屬性: 5V 電源,< 2ns 抖動(dòng)(VCXO)
已供物品:
9
FN7174.3
May 9, 2008
The resistance needed will depend on VCO design or VCXO
module selection.
Applications Information
Choosing External Components
1. To choose LC VCO components, first pick the desired
operating frequency. For our example, we will use
14.31818MHz, with an HSYNC frequency of 15.734kHz.
2. Choose a reasonable inductor value (10H to 20H
works well). We choose 15H.
3. Calculate CT needed to produce FOSC, as shown in
Equations 1 and 2.
4. From the varactor data sheet find CV @ 2.5V, the desired
lock voltage. CV = 23pF for our SMV1204-12, for
example.
5. C2 should be about 10CV, so we choose C2 = 220pF for
our example.
6. Calculate C1 using Equations 3 and 4. Since:
then:
For our example, C1 = 14pF (a trim capacitor may be used
for fine tuning). Examples for each frequency using the
internal divider follow.
Typical Application
Horizontal genlock provides clock for an analog to digital
converter, digitizing analog video.
FIGURE 11.
F
OSC
1
2
π LC
T
-----------------------
=
(EQ. 1)
C
T
1
4
π
2
F
2
L
---------------------
1
4
π
2
14.318e6
()
2
15e
6
()
---------------------------------------------------------------------
8.2pF
==
=
(EQ. 2)
C
T
C
1C2CV
C
1C2
()
C
1CV
()
C
2CV
()′
++
----------------------------------------------------------------------------
=
(EQ. 3)
C
1
C
2CTCV
C
2CV
() C
2CT
()
C
TCV
()
--------------------------------------------------------------------------
=
(EQ. 4)
TABLE 3. LC VCO COMPONENT VALUES (APPROXIMATE)
(NOTE)
FREQUENCY
(MHZ)
L1
(H)
C1
(pF)
C2
(pF)
13.301
15
18
220
13.5
15
17
220
14.75
12
18
220
17.734
12
10
220
10.738
22
20
220
12.273
18
17
220
14.318
15
14
220
NOTE: Use shielded inductors for optimum performance.
TABLE 4. XTAL VCO COMPONENT VALUES
(APPROXIMATE)
FREQUENCY
(MHz)
R1
(k
Ω)
C1
(pF)
C2
(F)
13.301
300
15
0.001
13.5
300
15
0.001
14.75
300
15
0.001
FIGURE 12. TYPICAL LC VCO
FIGURE 13. TYPICAL XTAL VCO
EL4584
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