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CDCE62005 Datasheet(PDF) 52 Page - Texas Instruments |
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CDCE62005 Datasheet(HTML) 52 Page - Texas Instruments |
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52 / 85 page  XTAL / AUX IN Output Divider 0 U0P U0N PFD/ CP Prescaler Feedback Divider Input Divider Smart MUX Output Divider 4 U4P U4N /1 - /80 U0P U0N PRI_REF SEC_REF /1 - /80 U4P U4N Divide by 1: Up to 1500 MHz Otherwise : Up to 1175 MHz Up to 5 Outputs : LVPECL or LVDS Up to 10 Outputs: LVCMOS CDCE62005 SCAS862F – NOVEMBER 2008 – REVISED JANUARY 2015 www.ti.com 8.4 Device Functional Modes 8.4.1 Fan-Out Buffer Each output of the CDCE62005 can be configured as a fan-out buffer (divider bypassed) or fan-out buffer with divide and skew control functionality. Figure 34. CDCE62005 Fan-out Buffer Mode 8.4.2 Clock Generator The CDCE62005 can generate 5–10 low noise clocks from a single crystal as follows: Figure 35. CDCE62005 Clock Generator Mode 8.4.3 Jitter Cleaner – Mixed Mode The following table presents a common scenario. The CDCE62005 must generate several clocks from a reference that has traversed a backplane. In order for jitter cleaning to take place, the phase noise of the on- board clock path must be better than that of the incoming clock. The designer must pay attention to the optimization of the loop bandwidth of the synthesizer and understand the phase noise profiles of the oscillators involved. Further, other devices on the card require clocks at frequencies not related to the backplane clock. The system requires combinations of differential and single-ended clocks in specific formats with specific phase relationships. NOTE Pay special attention when using the universal inputs with two different clock sources. Two clocks derived from the same source may use the internal bias generator and internal termination network without jitter performance degradation. However, if their origin is from different sources ( two independent oscillators, for example) then sharing the internal bias generator can degrade jitter performance significantly. 52 Submit Documentation Feedback Copyright © 2008–2015, Texas Instruments Incorporated Product Folder Links: CDCE62005 |
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