Cypress AN94024 Скачать руководство пользователя страница 13

 

 

Getting Started with CY27410/30: 4-PLL Spread-Spectrum Clock Generator 

 

 

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Document No. 001-94024 Rev.*A 

13 

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Содержание AN94024

Страница 1: ...ts Getting Started with CY27410 30 4 PLL Spread Spectrum Clock Generator 1 Contents 1 Overview 2 Key Specifications 2 Modes of Operation 2 CLKGEN Mode 2 ZDB Mode 3 NZDB Mode 3 Input Subsystem 3 Choosi...

Страница 2: ...ntroller frequency synthesis VCFS spread spectrum frequency select and glitch free outputs Key Specifications Input frequencies Crystal input 8 MHz to 48 MHz Reference clock 8 MHz to 250 MHz LVCMOS Re...

Страница 3: ...al 8 MHz to 700 MHz Figure 3 NZDB Configuration CY27410 can also be configured in combination of CLKGEN and ZDB CLKGEN and NZDB and ZDB and NZDB modes This offers unprecedented flexibility to the cust...

Страница 4: ...escribes how to interface the input reference signals to CY27410 and design considerations for input signals Input Frequency Tolerance The CY27410 design incorporates a narrow bandwidth high performan...

Страница 5: ...nputs The input swing amplitude should be more than 300 mV pp for the signal to meet the VIH VIL specifications LVCMOS Input Signal Figure 9 shows a simplified LVCMOS input buffer structure of CY27410...

Страница 6: ...ce standard is a differential I O standard and is defined in PCIe SIG standard Figure 14 shows the typical interface termination while Table 3 summarizes the recommended trace length parameters and te...

Страница 7: ...f 1 2 V Typical CML Output Standard CML interface is a differential I O standard and is defined in IEEE 802 3 spec Figure 20 shows the termination scheme of this standard Figure 20 CML Signaling Termi...

Страница 8: ...s function For example if trace characteristics are such that the propagation delay is 175 ps inch then a four inch delay will be 700 ps Voltage Controlled Frequency Shift VCFS CY27410 mimics the VCXO...

Страница 9: ...s overcome EMI EMC concerns The device supports both linear and nonlinear spread profiles and by using the patented Lexmark profile as the nonlinear profile offers the best peak EMI reduction in the i...

Страница 10: ...has two timing specifications fast switching and slow switching Fast switching is applicable for the output ON OFF output divider value change and output MUX setting change Slow switching is applicabl...

Страница 11: ...ates with CY27410 through commands and data that contains COM FS and miscellaneous information like I2C address read write protection etc Using an External I2 C Master You can use an external I2 C mas...

Страница 12: ...ument History Document Title Getting Started with CY27410 30 4 PLL Spread Spectrum Clock Generator AN94024 Document Number 001 94024 Revision ECN Orig of Change Submission Date Description of Change 4...

Страница 13: ...Cypress s patents that are infringed by the Software as provided by Cypress unmodified to make use distribute and import the Software solely for use with Cypress hardware products Any other use reprod...

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