IDT5V50009 Datasheet, PDF (1/8 Pages) Integrated Device Technology – SPREAD SPECTRUM CLOCK GENERATOR

SPREAD SPECTRUM CLOCK GENERATOR
DATASHEET
IDT5V50009
Description
The IDT5V50009 generates a low EMI output clock and a
reference clock from a clock or crystal input. The part is
designed to lower EMI through the application of spreading
a clock. Using IDT’s proprietary mix of analog and digital
Phase-Locked Loop (PLL) technology, the device spreads
the frequency spectrum of the output, reducing the
frequency amplitude peaks by several dB depending on
spread range. The IDT5V50009 offers a range of down
spread from a high speed clock or crystal input. The
IDT5V50009 generates one modulated (SSCLK) and
unmodulated (REFCLK) clock. The modulated clock is
controlled by the select pin, and the unmodulated clock has
the same frequency as the input clock or crystal.
Features
• Packaged in 8-pin SOIC
• Available in Pb (lead) free package
• Input frequency range 20- 40 MHz
• Provides modulated and unmodulated clocks
• Accepts a clock or crystal input
• Provides down spread modulation
• Provides power down function
• Reduce electromagnetic interference (EMI) by
8-16 db
• Operating voltage of 3.3 V
• Advanced, low-power CMOS process
Block Diagram
VDD
PD
S0
X1/CLK
X2
External caps required for
with crystal for accurate
tuning of the clock
Clock Buffer/
Crystal
Ocsillator
PLL Clock
Synthesis and
Spread
Spectrum
Circuitry
GND
REFCLK
SSCLK
IDT™ SPREAD SPECTRUM CLOCK GENERATOR
1
IDT5V50009 REV C 040609