參數(shù)資料
型號(hào)： SY89532L
英文描述： High Voltage Rectifer Diodes
中文描述： 可編程輸出頻率合成器
文件頁(yè)數(shù)： 5/10頁(yè)
文件大?。?/td> 314K
代理商： SY89532L
5
ClockWorks
SY89529L
Micrel
Spread Spectrum
Spread-spectrum clocking is a frequency modulation
technique 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 the figure 3 below. The ramp profile can be
expressed as:
Fnom = Nominal Clock Frequency in Spread OFF mode
(200MHz with 16.66MHz IN)
Fm = Nominal Modulation Frequency (30kHz)
δ
= Modulation Factor (0.5% down spread)
1
2
0
1
fm
2
1
2
1
fm
2
1
fm
(
)
+
×
×
×
< <
t
+
(
)
×
×
×
< <
t
δ
δ
δ
δ
fnom
fm
fnom
t when
fnom
fm
fnom
t when
,
–
0.5/fm
1/fm
fnom
(1
–
δ
) fnom
t
Figure 3. Triangle Frequency Modulation
The SY89529L triangle modulation frequency deviation (
δ
)
will not exceed 0.6% down-spread from the nominal clock
frequency (+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 4. The ratio of this
width to the fundamental frequency is typically 0.5%, and will
not exceed 0.6%. The resulting spectral reduction will be
greater than 7dB, as shown in Figure 5. It is important to note
the SY89529L 7dB minimum spectral reduction is the
component-specific EMI reduction, and will not necessarily be
the same as the system EMI reduction.
200MHz Clock Output in Frequency Domain
(A) Spread-Spectrum OFF
(B) Spread-Spectrum ON
TIME (400μs/div.)
R = 560
C1 = 1000pF
C2 = 0.47
μ
F
V
CC
= 3.3V
T
A
= 25C
Figure 5. 200MHz Clock Output in Frequency Domain
Figure 4. 0.38% Modulation,
32.7KHz Modulation Frequency
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參數(shù)描述
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SY89532LHH TR 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 LVPECL 3.3V Prec Clock Synthesizer IC RoHS:否 制造商:Micrel 輸出端數(shù)量:3 輸出電平:LVDS, LVPECL 最大輸出頻率:622.08 MHz 輸入電平:CMOS, LVTTL 最大輸入頻率:18 MHz 電源電壓-最大:3.6 V 電源電壓-最小:3 V 封裝 / 箱體:TQFP-64 封裝:Reel
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