User Manual

MAX3673
Low-Jitter Frequency Synthesizer
with Selectable Input Reference
______________________________________________________________________________________ 13
Power Supply and Ground Connections
The MAX3673 has seven supply connection pins;
installation of a bypass capacitor at each supply pin is
recommended. All seven supply connections should be
driven from the same source to eliminate the possibility
of independent power-supply sequencing. Excessive
supply noise can result in increased jitter.
The 56-pin TQFN package features an exposed pad
(EP), which provides a low-resistance thermal path for
heat removal from the IC and must be connected to the
circuit board ground plane for proper operation.
ESD
STRUCTURES
REFCLKx, FB_IN
REFCLKx, FB_IN
V
CC
V
CC
V
CC
- 1.34V
> 20kΩ> 20kΩ
200Ω
200Ω
MAX3673
Figure 5. Equivalent LVPECL Input Circuit
Figure 6. Equivalent LVPECL Output Circuit
Figure 7. Thevenin Equivalent LVPECL Termination
ESD
STRUCTURES
OUTxx
V
CC
OUTxx
MAX3673
82Ω
Z = 50Ω
Z = 50Ω
82Ω
130Ω 130Ω
+3.3V +3.3V
+3.3V
LVPECLLVPECL
+3.3V