
DATASHEET
SPREAD SPECTRUM CLOCK SYNTHESIZER
ICS650-44
IDT / ICS SPREAD SPECTRUM CLOCK SYNTHESIZER
1
ICS650-44
REV E 051310
Description
The ICS650-44 is a spread spectrum clock synthesizer
intended for video projector and digital TV applications. It
generates three copies of an EMI optimized 50 MHz clock
signal (EMI peak reduction of 7 to 14 dB on 3rd through
19th harmonics) through the use of Spread Spectrum
techniques from a 25 MHz crystal or clock input. The
modulation rate is 50 kHz.
Features
Packaged in 16-pin TSSOP (173 mil)
Supply voltages: VDD = 3.3 V, VDDO = 2.5 V
Peak-to-peak jitter: ±125 ps typ
Output duty cycle 45/55% (worst case)
25 MHz crystal or reference clock input
Zero (0) ppm frequency error on all output clocks
Advanced, low-power CMOS process
Industrial temperature range (-40 to +85°C)
Pb (lead) free package
Block Diagram
Crystal
OSC
GND
2
3
VDD
Control
Logic
50M
X2
25 MHz crystal
or clock input
External capacitors are
required with a crystal
input.
X1/CLKIN
50M
FS3:0
VDDO
PDTS
PLL with
Spread
Spectrum
50M