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CDCE62005 Datasheet(PDF) 31 Page - Texas Instruments |
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CDCE62005 Datasheet(HTML) 31 Page - Texas Instruments |
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31 / 85 page  360 Stepsize(deg) = = 22.5 /Step 16 o /1 - /80 Digital Phase Adjust (7-bits) Clock IN (from Output MUX) To Output Buffer Clock IN Output Divider (no adjust ) Output Divider (phase adjust ) Start Divider 1 ( ) f = ClockIN Stepsize sec OutputDivideRatio 360 ( ) = degrees Stepsize deg OutputDivideRatio CDCE62005 www.ti.com SCAS862F – NOVEMBER 2008 – REVISED JANUARY 2015 8.3.5.11 Digital Phase Adjust Figure 25 provides an overview of the Digital Phase Adjust feature. The output divider includes a coarse phase adjust that shifts the divided clock signal that drives the output buffer. Essentially, the Digital Phase Adjust timer delays when the output divider starts dividing; thereby shifting the phase of the output clock. The phase adjust resolution is a function of the divide function. Coarse phase adjust parameters include: Number of phase delay steps the number of phase delay steps available is equal to the divide ratio selected. For example, if a Divide by 4 is selected, then the Digital Phase Adjust can be programmed to select when the output divider changes state based upon selecting one of the four counts on the input. Figure 25 shows an example of divide by 16 in which there are 16 rising edges of Clock IN at which the output divider changes state (this particular example shows the fourth edge shifting the output by one fourth of the period of the output). Phase delay step size the step size is determined by the number of phase delay steps according to the following equations: (5) (6) Figure 25. CDCE62005 Phase Adjust 8.3.5.12 Phase Adjust Example Given: • Output Frequency = 30.72 MHz • VCO Operating Frequency = 1966.08 MHz • Prescaler Divider Setting = 4 • Output Divider Setting = 16 (7) 8.3.5.13 Valid Register Settings for Digital Phase Adjust Blocks Table 14 through Table 19 provide a list of valid register settings for the digital phase adjust blocks. Copyright © 2008–2015, Texas Instruments Incorporated Submit Documentation Feedback 31 Product Folder Links: CDCE62005 |
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