IDT / ICS 3.3V LVPECL FREQUENCY SYNTHESIZER
10
ICS843004AG-02 REV A JULY 30, 2007
ICS843004-02
CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
TERMINATION FOR 3.3V LVPECL OUTPUT
V
CC - 2V
50
Ω
50
Ω
RTT
Z
o = 50Ω
Z
o = 50Ω
FOUT
FIN
RTT =
Z
o
1
((V
OH + VOL) / (VCC – 2)) – 2
3.3V
125
Ω
125
Ω
84
Ω
84
Ω
Z
o = 50Ω
Z
o = 50Ω
FOUT
FIN
The clock layout topology shown below is a typical ter mina-
tion for LVPECL outputs. The two different layouts mentioned
are recommended only as guidelines.
FOUT and nFOUT are low impedance follower outputs that
generate ECL/LVPECL compatible outputs. Therefore, ter-
minating resistors (DC current path to ground) or current
sources must be used for functionality. These outputs are
FIGURE 4B. LVPECL OUTPUT TERMINATION
FIGURE 4A. LVPECL OUTPUT TERMINATION
designed to drive 50
Ω transmission lines. Matched imped-
ance techniques should be used to maximize operating fre-
quency and minimize signal distor tion.
Figures 4A and 4B
show two different layouts which are recommended only as
guidelines. Other suitable clock layouts may exist and it
would be recommended that the board designers simulate
to guarantee compatibility across all printed circuit and clock
component process variations.