器件名称: IDT5V50009
功能描述: SPREAD SPECTRUM CLOCK GENERATOR
文件大小: 181.98KB 共8页
简 介:DATASHEET
SPREAD SPECTRUM CLOCK GENERATOR 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.
IDT5V50009
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 PLL Clock Synthesis and Spread Spectrum Circuitry REFCLK
X1/CLK Clock Buffer/ Crystal Ocsillator X2 External caps required for with crystal for accurate tuning of the clock
SSCLK
GND
IDT SPREAD SPECTRUM CLOCK GENERATOR
1
IDT5V50009
REV C 040609
IDT5V50009 SPREAD SPECTRUM CLOCK GENERATOR
SSCG
Pin Assignment
X1/ICLK GND S0 SSCLK 1 ……