CDCE62005 Datasheet, PDF (40/76 Pages) Texas Instruments – Five/Ten Output Clock Generator/Jitter Cleaner With Integrated Dual VCOs

CDCE62005
SCAS862 – NOVEMBER 2008........................................................................................................................................................................................... www.ti.com
Table 15. CDCE62005 Universal Input Buffer Configuration Matrix (continued)
PRI_IN CONFIGURATION MATRIX
Register.Bit →
Bit Name →
5.7
HYSTEN
1
1
1
1
1
1
0
1
5.1
INBUFSELY
1
1
1
1
1
1
X
X
SETTINGS
5.0
5.8
INBUFSELX PRI_TERMSEL
0
0
0
0
0
1
1
0
1
0
1
1
X
X
X
X
5.9
PRIINVBB
0
0
X
0
0
X
X
X
5.6
ACDCSEL
0
1
X
0
1
X
X
X
Hysteresis
ENABLED
ENABLED
ENABLED
ENABLED
ENABLED
ENABLED
OFF
ENABLED
CONFIGURATION
Mode
LVPECL
LVPECL
LVPECL
LVDS
LVDS
LVDS
—
—
Coupling
AC
DC
—
AC
DC
—
—
—
Termination
Internal
Internal
External
Internal
Internal
External
—
—
Vbb
1.9V
1.2V
—
1.2V
1.2V
—
—
—
LVDS Fail Safe Mode
Differential data line receivers can switch on noise in the absence of an input signal. This occurs when the bus
driver is turned off or the interconnect is damaged or missing. Traditionally the 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 16 for DC termination only.
Bit Name →
Register.Bit →
Table 16. LVDS Failsafe Settings
FAILSAFE
5.11
0
1
LVDS Failsafe
Disabled for all inputs
Enabled for all inputs
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 17 provides an overview of the configurations supported by the CDCE62005.
Table 17. CDCE62005 Smart Multiplexer Settings
EECLKSEL
5.5
1
1
1
1
1
0
REGISTER 5 SETTINGS
AUXSEL SECSEL
5.4
5.3
0
0
0
1
1
0
0
1
1
1
X
1
PRISEL
5.2
1
0
0
1
1
1
SMART MULTIPLEXER MODE
Manual Mode: PRI_IN selected
Manual Mode: SEC_IN selected
Manual Mode: AUX_IN selected
Auto MOde: PRI_IN then SEC_IN
Auto Mode: PRI_IN then SEC_IN then AUX_IN
REF_SEL pin selects PRI_IN or SEC_IN
40
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