pi6c3622 Pericom Semiconductor Corporation, pi6c3622 Datasheet - Page 7

• Manufacturer Part Number: pi6c3622
• Description: Low Power Spread Spectrum Frequency Multiplier
• Manufacturer: Pericom Semiconductor Corporation

Application Information
Two decoupling capacitors of 0.1uF and 1nF must be connected in parallel between VDD and GND. To opti-
mize device performance and to lower output noise, the coupling capacitors should be placed on the compo-
nent side of the board as close to these pins as possible. There should be no vias placed between the decou-
pling capacitors and VDD pin. The PCB trace to VDD pin should be as short as possible, and no vias should
be placed between VDD and the capacitors in the decoupling circuit.
Crystal Load Capacitor
If a crystal is used with the device, two external trim capacitors, CLtrim, are used to adjust the effective capac-
itance to match the required crystal load capacitance. The CLtrim value can be derived from formula CLtrim =
2*CL – (Cs + Ci). The typical CLtrim = 28pF when crystal load = 18pF, stray capacitance Cs = 3pF and XTAL
pins capacitance = 5pF.
Decoupling Capacitor
0.1uF 1nF
S0,S1,
SSON
VDD
Strapping to low
C
Ltrim
X1
7
Low Power Spread Spectrum Frequency Multiplier
0.1uF 1nF
Crystal
X2
S0,S1,
VDD
SSON
C
Ltrim
VDD
Strapping to high
SSCG-GP Family
PS8939A
PI6C3622
01/29/08