ics84330c Integrated Device Technology, ics84330c Datasheet - Page 8

• Manufacturer Part Number: ics84330c
• Description: 700mhz, Low Jitter, Crystal-to-3.3v Differential Lvpecl Frequency Synthesizer
• Manufacturer: Integrated Device Technology

Application Information
Power Supply Filtering Technique
As in any high speed analog circuitry, the power supply pins are
vulnerable to random noise. To achieve optimum jitter perform-
ance, power supply isolation is required. The ICS84330C provides
separate power supplies to isolate any high switching noise from
the outputs to the internal PLL. V
individually connected to the power supply plane through vias, and
0.01µF bypass capacitors should be used for each pin. Figure 2
illustrates this for a generic V
requires that an additional 10Ω resistor along with a 10µF bypass
capacitor be connected to the V
Recommendations for Unused Input and Output Pins
Inputs:
LVCMOS Control Pins
All control pins have internal pullups or pulldowns; additional
resistance is not required but can be added for additional
protection. A 1kΩ resistor can be used.
IDT™ / ICS™ LVPECL FREQUENCY SYNTHESIZER
ICS84330C
700MHZ, LOW JITTER, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
CC
CCA
pin and also shows that V
CC
and V
pin.
CCA
should be
CCA
8
Outputs:
TEST Output
The unused TEST output can be left floating. There should be no
trace attached.
LVPECL Outputs
The unused LVPECL output pair can be left floating. We
recommend that there is no trace attached. Both sides of the
differential output pair should either be left floating or terminated.
Figure 2. Power Supply Filtering
V
V
CCA
CC
ICS84330CV REV. C JANUARY 28, 2009
.01µF
.01µF
3.3V
10Ω
10µF