ICS650-44

SPREAD SPECTRUM CLOCK SYNTHESIZER DATASHEET ICS650-44 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 25 MHz crystal or clock input X1/CLKIN X2 External capacitors are required with a crystal input. FS3:0 Crystal OSC Control Logic VDD 3 VDDO PLL with Spread Spectrum 50M 50M 50M GND 2 PDTS IDT™ / ICS™ SPREAD SPECTRUM CLOCK SYNTHESIZER 1 ICS650-44 REV E 051310 ICS650-44 SPREAD SPECTRUM CLOCK SYNTHESIZER Pin Assignment X1/ CLKIN FS0 FS1 50M VDD GND FS3 50M 1 2 3 4 5 6 7 8 16 X2 15 VDD 14 PDTS 13 FS2 12 VDD 11 GND 10 VDDO 9 50M 16-pin ( 173 mil) TSSOP CLOCK SYNTHESIZER Spread Spectrum and Output Configuration Table FS3 FS2 FS1 FS0 000 0 000 1 001 0 001 1 010 0 010 1 011 0 011 1 100 0 100 1 101 0 101 1 110 0 110 1 111 0 111 1 Spread Type Center Center Center Center Cent...