PDF CY25561 Data sheet ( Hoja de datos )

Número de pieza	CY25561
Descripción	Spread Spectrum Clock Generator
Fabricantes	Cypress Semiconductor
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No Preview Available ! CY25561 Spread Spectrum Clock Generator Features ■ 50 to 166 MHz Operating Frequency Range ■ Wide Range of Spread Selections:9 ■ Accepts Clock and Crystal Inputs ■ Low Power Dissipation ❐ 70 mW–Typ at 66 MHz ■ Frequency Spread Disable Function ■ Center Spread Modulation ■ Low Cycle-to-cycle Jitter ■ 8-pin SOIC Package Logic Block Diagram Xin/ CLK 1 300 K Xout 8 Applications ■ Desktop, notebook, and tablet PCs ■ VGA controllers ■ LCD panels and monitors ■ Workstations and servers Benefits ■ Peak EMI reduction by 8 to16 dB ■ Fast time to market ■ Cost reduction REFERENCE DIVIDER MODULATION CONTROL PD CP FEEDBACK DIVIDER Loop Filter vco VDD 2 VSS 3 INPUT DECODER LOGIC VDD 20K VDD 20K 5 SSCC 20K VSS 67 S1 S0 20K VSS DIVIDER & MUX 4 SSCLK Cypress Semiconductor Corporation • 198 Champion Court wwwD.DocautamSheenett4NUu.nmebt er: 38-07242 Rev. C • San Jose, CA 95134-1709 • 408-943-2600 Revised September 15, 2008 [+] Feedback 1 page CY25561 Modulation Rate Spectrum spread clock generators use frequency modulation (FM) to distribute energy over a specific band of frequencies. The maximum frequency of the clock (Fmax) and minimum frequency of the clock (Fmin) determine this band of frequencies. The time required to transition from Fmin to Fmax and back to Fmin is the period of the modulation rate, Tmod. Modulation rates of SSCG clocks are most commonly referred to in terms of frequency or Fmod = 1/Tmod. The input clock frequency, Fin, and the internal divider count, Cdiv, determine the modulation rate. In some SSCG clock generators, the selected range determines the internal divider count. In other SSCG clocks, the internal divider count is fixed over the operating range of the part. CY25561 has a fixed divider count, as shown in Figure 3. Figure 3. SSCG Clock, Part Number, Fin = 65 MHz Device CY25561 Cdiv 2332 (All Ranges) Example: Device = CY25561 Fin = 65 MHz Range = S1 = 1, S0 = 0 Then; Modulation Rate = Fmod = 65 MHz/2332 = 27.9 kHz. Analyzer Modulation Profile Spectrum Document Number: 38-07242 Rev. C Page 5 of 9 [+] Feedback 5 Page

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Número de pieza	Descripción	Fabricantes
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