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CDCE62005 Datasheet(PDF) 70 Page - Texas Instruments |
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CDCE62005 Datasheet(HTML) 70 Page - Texas Instruments |
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70 / 85 page  CDCE62005 SCAS862F – NOVEMBER 2008 – REVISED JANUARY 2015 www.ti.com 9 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 9.1 Application Information 9.1.1 Frequency Synthesizer As shown in Figure 47, the CDCE62005 has internal dividers, twin onboard VCOs, a phase frequency detector, charge pump, partially internal loop filter, and LVPECL/LVDS/LVCMOS input and output buffers, all of which completes a PLL. Through the PLL operation, the VCO clock synchronizes with the reference clock input and ultimately with all clock outputs. All outputs are completely synchronized in terms of phase and frequency with the reference clock input. When powering up from the EEPROM, the SYNC signal synchronizes outputs after device power-up. See SCAA096 for a detailed description of the application configuration. 9.2 Typical Application Figure 47. CDCE62005 Settings for Multiple Frequency Synthesis Example 9.2.1 Design Requirements Assume a typical application, where a total of two 156.25-MHz LVPECL, two 125-MHz LVDS, and two 25-MHz LVCMOS output clocks are desired and should be phase-locked to a single back-plane input reference clock of 25 MHz. The goal of this example is to identify the input (M), prescaler (N), feedback (FB), and output (P) divider values, the VCO frequency to lock to, and the other related PLL settings needed to derive the different output frequencies from the common input and VCXO frequencies. Follow the steps outlined in Detailed Design Procedure to achieve this goal. 70 Submit Documentation Feedback Copyright © 2008–2015, Texas Instruments Incorporated Product Folder Links: CDCE62005 |
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