HD151TS307ARP Datasheet, PDF (5/9 Pages) Renesas Technology Corp – Spread Spectrum Clock for EMI Solution

HD151TS307ARP
SSCCLKOUT
tcycle n
tcycle n+1
t _CCS = (tcycle n) - (tcycle n+1)
Figure 1 Cycle to cycle jitter
Application Information
1. Recommended Circuit Configuration
The power supply circuit of the optimal performance on the application of a system should refer to Fig. 2.
VDD decoupling is important to both reduce Jitter and EMI radiation.
The C1 decoupling capacitor should be placed as close to the VDD pin as possible, otherwise the increased trace
inductance will negate its decoupling capability.
The C2 decoupling capacitor shown should be a tantalum type.
XIN
(Crystal or
1
Reference input)
XOUT
(Crystal or
2
Not connection)
SEL1 3
8
VDD
C1 C2
7 SEL0 _{GND GND}
R1
6
SSCCLKOUT
NC 4
5
Notes:
C1 = High frequency supply decoupling capacitor.
(0.1 µF recommended)
C2 = Low frequency supply decoupling capacitor.
(22 µF tantalum type recommended)
R1 = Match value to line impedance.
(22 Ω Reference value)
GND
Figure 2 Recommended circuit configuration
Rev.4.00 Jul. 08, 2004 page 5 of 8