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ICS149317 Datasheet(PDF) 1 Page - Integrated Circuit Systems |
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ICS149317 Datasheet(HTML) 1 Page - Integrated Circuit Systems |
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1 / 11 page  ICS1493-17 MDS 1493-17 A 1 Revision 101005 Integrated Circuit Sy stems ● 5 25 Race Street, San Jo se, CA 9 512 6 ● tel (40 8) 2 97-12 01● www.ics t.co m Clock Synthesizer for Portable Systems PRELIM INAR Y INFORMA T ION Description The ICS1493-17 is a low-power, low-jitter clock synthesizer designed to replace multiple crystals and oscillators in portable audio/video systems. The device generates a 37 MHz processor clock, a 48 MHz USB clock, a fixed 22.5792 MHz audio clock, a selectable 24.576 MHz or 22.5792 MHz audio clock, and a 27MHz reference clock for video. Using ICS’ proprietary mix of analog and digital Phase-Locked Loop (PLL) technology, the device spreads the frequency spectrum of the 37 MHz output, reducing the peak amplitude of by up to 16 dB. An output enable (OE) pin lowers the chip power consumption while tri-stating all outputs. Features • Extremely low operating current (11 mA) • Packaged in 20-pin QFN (Pb-free) • Input crystal or clock frequency of 27 MHz • Output reference frequency of 27 MHz • Fixed output frequencies of 37 MHz, 48 MHz and 22.5792 MHz • Selectable output frequency of either 22.5792 MHz or 24.576 MHz • Configurable spread spectrum on 37 MHz output • Operating core voltage of 1.8 V • Output voltage of 1.8 V or 2.5 V • Advanced, low-power CMOS process Block Diagram X1 X2 PLL1 (Spread) PLL2 Crystal Oscillator/ Clock Buffer 27 MHz clock or crystal input Optional tuning capacitors VDD GND 27M 37M 3 5 PLL3 22/24M PLL4 22M SCK 48M IIC Control Logic SDATA OE VDDO 2 |
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