ICS650-47

P R E L I M I N A R Y I N F O R M AT I O N ICS650-47 Spread Spectrum Clock Synthesizer Description The ICS650-47 is a spread spectrum clock synthesizer intended for video projector applications. It generates an EMI optimized 50 MHz clock signal through the use of Spread Spectrum techniques from a 25 MHz crystal or clock input. For the 50 MHz output, 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) Guarantees +85°C operational condition 25 MHz crystal or reference clock input Zero (0) ppm frequency error on all output clocks Advanced, low-power CMOS process Industrial temperature range (0 to +85°C) Block Diagram VDD 25 MHz crystal or clock input X1/CLKIN Crystal OSC X2 External capacitors are required with a crystal input. VDDO 3 PLL with Spread Spectrum 50M FS3:0 SS_EN Control Logic 2 GND PDTS MDS 650-47 B Integrated Circuit Systems, Inc. ● 1 525 Race Street, San Jose, CA 95126 ● Revision 082305 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 ICS650-47 Spread Spectrum Clock Synthesizer Pin Assignment X1/CLKIN FS0 FS1 SS_EN VDD GND FS3 NC 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 0 1 1 1 1 0 0 0 0 1 1 1 1 FS1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 FS0 0 1 0 1 ...