Datasheet

Hardware Configuration
3-5
EVM Hardware
3.2.7 AC-Coupling at PRI_REF (C1, R4, R6) and SEC_REF (C5, R13, R15)
An ac-coupling is provided at PRI_REF and SEC_REF to ease the use of the
CDCM7005 with different signaling levels (LVCMOS, LVPECL, LVDS,...).
However, the ac-coupling will increase the PLL stabilization time after power
up due to transient effects. It also increases the switching time between
PRI_REF and SEC_REF in case of automatic reference clock switching.
Therefore, the ac-coupling must be removed for optimized system
performance (C1 and C5 has to be replaced with an 0-Ω resistor and R4, R6,
R13, and R15 have to be removed).