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CDCE62005 Datasheet(PDF) 25 Page - Texas Instruments |
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CDCE62005 Datasheet(HTML) 25 Page - Texas Instruments |
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25 / 85 page  CDCE62005 www.ti.com SCAS862F – NOVEMBER 2008 – REVISED JANUARY 2015 Table 5. CDCE62005 Universal Input Buffer Configuration Matrix (continued) PRI_REF CONFIGURATION MATRIX SEC_REF CONFIGURATION MATRIX SETTINGS CONFIGURATION Register.Bit → 5.7 5.1 5.0 6.12 5.10 5.6 Bit Name → HYSTEN INBUFSELY INBUFSELX SEC_TERMSEL SECINVBB ACDCSEL Hysteresis Mode Coupling Termination Vbb 1 0 0 X X X ENABLED LVCMOS DC N/A — 1 1 0 0 0 0 ENABLED LVPECL AC Internal 1.9V 1 1 0 0 0 1 ENABLED LVPECL DC Internal 1.2V(1) 1 1 0 1 X X ENABLED LVPECL — External — 1 1 1 0 0 0 ENABLED LVDS AC Internal 1.2V 1 1 1 0 0 1 ENABLED LVDS DC Internal 1.2V 1 1 1 1 X X ENABLED LVDS — External — 0 X X X X X OFF — — — — 1 X X X X X ENABLED — — — — 8.3.5.2 LVDS Fail Safe Mode Differential receivers can switch on noise in the absence of an input signal. This occurs when the clock driver is turned off or the interconnect is damaged or missing. The traditional solution to this problem involves incorporating an external resistor network on the receiver input. This network applies a steady-state bias voltage to the input pins. The additional cost of the external components notwithstanding, the use of such a network lowers input signal magnitude and thus reduces the differential noise margin. The CDCE62005 provides internal failsafe circuitry on all LVDS inputs if enabled as shown in Table 6 for DC termination only. Table 6. LVDS Failsafe Settings BIT NAME → FAILSAFE LVDS FAILSAFE REGISTER.BIT → 5.11 0 Disabled for all inputs 1 Enabled for all inputs 8.3.5.3 Smart Multiplexer Controls The smart multiplexer implements a configurable switching mechanism suitable for many applications in which fault tolerance is a design consideration. It includes the multiplexer itself along with three dividers. With respect to the multiplexer control, Table 7 provides an overview of the configurations supported by the CDCE62005. Table 7. CDCE62005 Smart Multiplexer Settings REGISTER 5 SETTINGS EECLKSEL AUXSEL SECSEL PRISEL SMART MULTIPLEXER MODE 5.5 5.4 5.3 5.2 1 0 0 1 Manual Mode: PRI_REF selected 1 0 1 0 Manual Mode: SEC_REF selected 1 1 0 0 Manual Mode: AUX IN selected 1 0 1 1 Auto Mode: PRI_REF then SEC_REF 1 1 1 1 Auto Mode: PRI_REF then SEC_REF then AUX IN(1) 0 0 1 1 REF_SEL pin selects PRI_REF or SEC_REF (1) For this mode of operation, a crystal must be connected to the AUX IN input pin. Copyright © 2008–2015, Texas Instruments Incorporated Submit Documentation Feedback 25 Product Folder Links: CDCE62005 |
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