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參數資料
| 型號： | CYIFS781 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | Low EMI Spectrum Spread Clock(低EMI擴頻時鐘) |
| 中文描述： | 低EMI擴頻時鐘頻譜（低電磁干擾擴頻時鐘） |
| 文件頁數： | 1/12頁 |
| 文件大?。?/td> | 231K |
| 代理商： | CYIFS781 |
Low EMI Spectrum Spread Clock
FS781/82/84
Cypress Semiconductor Corporation
Document #: 38-07029 Rev. *F
198 Champion Court
San Jose
,
CA 95134-1709
408-943-2600
Revised January 2, 2005
Features
Spread Spectrum clock generator (SSCG) with 1×, 2×,
and 4× outputs
6- to 82-MHz operating frequency range
Modulates external clocks including crystals, crystal
oscillators, or ceramic resonators
Programmable modulation with simple R-C external
loop filter (LF)
Center spread modulation
3V-5V power supply
TTL-/CMOS-compatible outputs
Low short-term jitter
Low-power Dissipation
— 3.3 VDC = 37 mW – typical
— 5.0 VDC = 115 mW – typical
Available in 8-pin SOIC and TSSOP packages
Applications
Desktop/notebook computers
Printers, copiers, and MFP
Scanners and fax
LCD displays and monitors
CD-ROM, VCD, and DVD
Automotive and embedded systems
Networking, LAN/WAN
Digital cameras and camcorders
Modems
Benefits
Programmable EMI reduction
Fast time to market
Lower cost of compliance
No degradation in rise/fall times
Lower component and PCB layer count
Functional Description
The Cypress FS781/82/84 are Spread Spectrum clock
generator ICs (SSCG) designed for the purpose of reducing
electromagnetic interference (EMI) found in today’s
high-speed digital systems.
The FS781/82/84 SSCG clocks use a Cypress-proprietary
technology to modulate the input clock frequency, XIN, by
modulating the frequency of the digital clock. By modulating
the reference clock the measured EMI at the fundamental and
harmonic frequencies of FSOUT is greatly reduced. This
reduction in radiated energy can significantly reduce the cost
of complying with regulatory requirements without degrading
digital waveforms.
The Cypress FS781/82/84 clocks are very simple and
versatile devices to use. By programming the two range select
lines, S0 and S1, any frequency from 6- to 82-MHz operating
range can be selected. The FS781/2/4 are designed to
operate over a very wide range of input frequencies and
provides 1×, 2×, and 4× modulated clock outputs.
The FS78x devices have a simple frequency selection table
that allows operation from 6 MHz to 82 MHz in four separate
ranges. The bandwidth of the frequency spread at FSOUT is
determined by the values of the loop filter components. The
modulation rate is determined internally by the input frequency
and the selected input frequency range.
The Bandwidth of these products can be programmed from as
little as 1.0% up to as much as 4.0% by selecting the proper
loop filter value. Refer to the Loop Filter Selection chart in
Table 2
and
Table 3
for the recommended values. Due to a
wide range of application requirements, an external loop filter
(LF) is used on the FS78x products. The user can select the
exact amount of frequency modulation suitable for the appli-
cation. Using a fixed internal loop filter would severely limit
the use of a wide range of modulation bandwidths (Spread %)
to a few discrete values. Refer to FS791/2/4 products for appli-
cations requiring 80- to 140-MHz frequency range.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| CYIFS781BSXC | 功能描述:鎖相環 - PLL Reduction SSCGs COM RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
| CYIFS781BSXCT | 功能描述:鎖相環 - PLL Reduction SSCGs COM RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
| CYIFS781BZXC | 功能描述:鎖相環 - PLL Reduction SSCGs COM RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
| CYIFS781BZXCT | 功能描述:鎖相環 - PLL Reduction SSCGs COM RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
| CYIFS782BSXC | 功能描述:鎖相環 - PLL Reduction SSCGs COM RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
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