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參數(shù)資料
| 型號： | ICS84314AY-02LFT |
| 英文描述： | 700MHZ, CRYSTAL-TO-3.3V/2.5V LVPECL FREQUENCY SYNTHESIZER W/FANOUT BUFFER |
| 中文描述： | 700MHz的，CRYSTAL-TO-3.3V/2.5V LVPECL的頻率合成瓦/扇出緩沖器 |
| 文件頁數(shù)： | 14/17頁 |
| 文件大?。?/td> | 196K |
| 代理商： | ICS84314AY-02LFT |
84314AY-02
www.icst.com/products/hiperclocks.html
REV. B NOVEMBER 17, 2005
14
Integrated
Circuit
Systems, Inc.
ICS84314-02
700MH
Z
, C
RYSTAL
-
TO
-3.3V/2.5V LVPECL
F
REQUENCY
S
YNTHESIZER
W
/F
ANOUT
B
UFFER
PRELIMINARY
Spread-spectrum clocking is a frequency modulation tech-
nique for EMI reduction. When spread-spectrum is enabled,
a 30kHz triangle waveform is used with 0.5% down-spread
(+0.0% / -0.5%) from the nominal 200MHz clock frequency.
An example of a triangle frequency modulation profile is shown
in
Figure 7A
below. The ramp profile can be expressed as:
Fnom = Nominal Clock Frequency in Spread OFF mode
(200MHz with 16MHz IN)
Fm = Nominal Modulation Frequency (30kHz)
δ
= Modulation Factor (0.5% down spread)
(1 -
δ
) fnom + 2 fm x
δ
x fnom x t when 0 < t <
,
(1 -
δ
) fnom - 2 fm x
δ
x fnom x t when
< t <
1
2 fm
1
2 fm
1
fm
The ICS84314-02 triangle modulation frequency deviation will
not exceed 0.6% down-spread from the nominal clock fre-
quency (+0.0% / -0.5%). An example of the amount of down
spread relative to the nominal clock frequency can be seen in
the frequency domain, as shown in
Figure 7B.
The ratio of
this width to the fundamental frequency is typically 0.4%,
and will not exceed 0.6%. The resulting spectral reduction
will be greater than 7dB, as shown in Figure 7B. It is impor-
tant to note the ICS84314-02 7dB minimum spectral reduc-
tion is the component-specific EMI reduction, and will not
necessarily be the same as the system EMI reduction.
F
IGURE
6B. 200MH
Z
C
LOCK
O
UTPUT
IN
F
REQUENCY
D
OMAIN
(A) S
PREAD
-S
PECTRUM
OFF
(B) S
PREAD
-S
PECTRUM
ON
F
IGURE
6A. T
RIANGLE
F
REQUENCY
M
ODULATION
S
PREAD
S
PECTRUM
Fnom
(1 -
δ
) Fnom
0.5/fm
1/fm
B
A
Δ
10 dBm
δ
= 0.4%
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| ICS84314AYT | 制造商:ICS 制造商全稱:ICS 功能描述:350MHZ, CRYSTAL-TO-3.3V/2.5V LVPECL FREQUENCY SYNTHESIZER W/FANOUT BUFFER |
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