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CDCE62002 Datasheet(PDF) 29 Page - Texas Instruments |
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CDCE62002 Datasheet(HTML) 29 Page - Texas Instruments |
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29 / 49 page  Reference Input Buffer UniversalInputControl PN PP Register 0 0 1 4 Register 0 0 5 REF_IN Vbb 1uF Vbb 0.0 0.1 0.4 0.5 INBUFSELX INBUFSELY ACDCSEL TERMSEL P N VBB 0 0 X 1 OFF OFF 0 1 1 OFF 1 0 0 0 ON ON 0 1 0 ON ON SWITCHStatus VBB Settings 1 X X 0 ON ON 1 1 0 1.9V ON ON 1.2V 1.2V 1.2V BitName --> Register.Bit --> INBUFSELX INBUFSELY 0.0 0.1 LVDS 0 0 Disabled 0 1 LVPECL 1 0 LVCMOS 1 1 InputBufferSelect InputBuffer Mode 5k 5k Smart Multiplexer Dividers ReferenceDivider /1 - /8 REF_IN XTAL / AUX _IN Smart MUX SmartMUX Control 2 3 Register 0 8 7 6 Register 0 9 1 Register 0 SmartMultiplexer Pre-Divider /1 or /2 0 REFSEL AUXSEL 0.2 0.3 AUXSelect 0 0 Reserved 1 0 REFSelect 0 1 AutoSelect 1 1 Setting SmartMux Mode CDCE62002 www.ti.com.............................................................................................................................................................. SCAS882A – JUNE 2009 – REVISED JULY 2009 Figure 22 shows the key elements of a Universal Input Buffer (UIB). A UIB supports multiple formats along with different termination and coupling schemes. The CDCE62002 implements the UIB by including on board switched termination, a programmable bias voltage generator, and a multiplexer. The CDCE62002 provides a high degree of configurability on the UIB to facilitate most existing clock input formats. Figure 22. CDCE62002 Universal Input Buffer Figure 23. CDCE62002 Smart Multiplexer In Auto Select Mode the Smart Mux switches automatically between Reference input and Auxiliary input with a preference to the Reference input. In order for the Smart Mux to function correctly the frequency after the reference divider and the Auxiliary Input signal frequency should be within 20% of each other or one of them should be zero or ground. In This mode a valid frequency needs to be present on AUX_IN before the /PD is deasserted or power is applied. Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 29 Product Folder Link(s): CDCE62002 |
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