ICS650G-44

P R E L I M I N A R Y I N F O R M AT I O N ICS650-44 Spread Spectrum Clock Synthesizer 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) Available in Pb (lead) free package Block Diagram VDD 3 25 MHz crystal or clock input X1/CLKIN Crystal OSC X2 External capacitors are required with a crystal input. VDDO 50M PLL with Spread Spectrum Control Logic 50M FS3:0 50M GND 2 PDTS MDS 650-44 C Integrated Circuit Systems, Inc. ● 1 525 Race Street, San Jose, CA 95126 ● Revision 080305 tel (408) 297-1201 ● www.icst.com P R E L I M I N A R Y I N F O R M AT I O N 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 15 14 13 12 11 10 9 X2 VDD PDTS FS2 VDD GND VDDO 50M Spread Spectrum and Output Configuration Table FS3 FS2 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 ...