ICS8402I Datasheet, PDF (11/19 Pages) Integrated Circuit Systems – 350MHZ, CRYSTAL-TO-LVCMOS / LVTTL FREQUENCY SYNTHESIZER

ICS8402I
350MHZ, CRYSTAL-TO-LVCMOS/LVTTL FREQUENCY SYNTHESIZER
Parameter Measurement Information, continued
20%
Clock
Outputs
80%
t_R
Output Rise/Fall Time
80%
t_F
20%
Application Information
Power Supply Filtering Technique
As in any high speed analog circuitry, the power supply pins are
vulnerable to random noise. The ICS8402I provides separate
power supplies to isolate any high switching noise from the outputs
to the internal PLL. V_DD, V_DDA and V_DDO 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 0.01µF
bypass capacitor should be connected to each V_DDA pin.
3.3V
V_DD
.01µF _10Ω
V_DDA
.01µF
10µF
Figure 2. Power Supply Filtering
IDT™ / ICS™ LVCMOS/LVTTL FREQUENCY SYNTHESIZER
11
ICS8402AYI REV. A OCTOBER 16, 2007