ics8430-111 Integrated Device Technology, ics8430-111 Datasheet - Page 9

• Manufacturer Part Number: ics8430-111
• Description: Programmable Low-jitter Lvpecl Or Lvcmos-input Lvpecl-output 2-output 700-mhz Clock Synthesizer
• Manufacturer: Integrated Device Technology

P
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS8430-111 provides
separate power supplies to isolate any high switching
noise from the outputs to the internal PLL. V
should be individually connected to the power supply
plane through vias, and bypass capacitors should be
used for each pin. To achieve optimum jitter performance, power
supply isolation is required. Figure 2 illustrates how a 10Ω
resistor along with a 10μF and a .01μF bypass capacitor
should be connected to each V
also be replaced by a ferrite bead.
R
I
TEST_CLK I
For applications not requiring the use of the test clock, it can be
left floating. Though not required, but for additional protection, a
1kΩ resistor can be tied from the TEST_CLK to ground.
CLK/nCLK I
For applications not requiring the use of the differential input,
both CLK and nCLK can be left floating. Though not required, but
for additional protection, a 1kΩ resistor can be tied from CLK to
ground.
LVCMOS C
All control pins have internal pull-ups or pull-downs; additional
resistance is not required but can be added for additional
protection. A 1kΩ resistor can be used.
IDT
NPUTS
OWER
ECOMMENDATIONS FOR
ICS8430-111
700MHZ, LOW JITTER, DIFFERENTIAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
™
/ ICS
:
S
™
3.3V LVPECL FREQUENCY SYNTHESIZER
UPPLY
ONTROL
NPUT
NPUT
:
:
F
P
ILTERING
INS
:
U
NUSED
T
ECHNIQUES
CCA
pin. The 10Ω resistor can
I
NPUT AND
A
CC
PPLICATION
, V
O
CCA
UTPUT
, and V
P
CCO
INS
9
I
NFORMATION
O
LVPECL O
All unused LVPECL outputs 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.
UTPUTS
:
UTPUT
F
IGURE
2. P
V
V
CCA
ICS8430DY-111 REV. F JANUARY 29, 2007
CC
OWER
.01μF
.01μF
S
UPPLY
3.3V
10Ω
F
10 μF
ILTERING
PRELIMINARY