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| 型號： | CY5057 |
| 英文描述： | Clocks and Buffers |
| 中文描述： | 時鐘和緩沖器 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 92K |
| 代理商： | CY5057 |
CY5057
Document #: 38-07363 Rev. *B
Page 4 of 8
Spread Spectrum
The CY5057 contains spread spectrum with flash program-
mable spread percentage and modulation frequency. Center
spread non-linear “Hershey kiss” modulation can be obtained.
Spread percentage can be programmed to values between
+0.250% and +2.00%, in 0.25% intervals. Only one spread
profile (for one specific percentage spread and for one output
frequency) can be programmed into the device at a time
The CY5057 has a spread spectrum On/Off function. The
spread spectrum can be enabled or disabled by users through
an external pin. Timing of this feature is shown in “switching
waveform” section.
Crystal Oscillator Tuning Cap Values
[1]
Figure 1. Crystal Oscillator Tuning Circuit
XOUT
XIN
C
XIN
C
XOUT
C0
C1
C2
C3
C4
C5
C6
C7
C7
C6
C5
C4
C3
C2
C1
C0
RF
Bit
Capacitance per Bit (pF)
24.32
12.16
6.08
3.04
1.52
0.76
0.38
0.19
C
7
C
6
C
5
C
4
C
3
C
2
C
1
C
0
Note:
1.
C
XIN,
C
XOUT,
and parasitic capacitance due to fixture and package should be included when calculating the total capacitance.
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相關代理商/技術參數(shù) |
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| CY5057_08 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:High-Frequency Flash Programmable PLL Die with Spread Spectrum |
| CY5057_11 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:High-Frequency Flash Programmable PLL Die with Spread Spectrum |
| CY5057-11WAF | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:High-Frequency Flash Programmable PLL Die with Spread Spectrum |
| CY5057-11WAF-IL | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:High-Frequency Flash Programmable PLL Die with Spread Spectrum |
| CY5057-29WAF-IL | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:High-Frequency Flash Programmable PLL Die with Spread Spectrum |
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