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ICS3727XP Datasheet(PDF) 1 Page - Integrated Circuit Systems |
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ICS3727XP Datasheet(HTML) 1 Page - Integrated Circuit Systems |
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1 / 7 page  ICS3727XP MDS 3727XP A 1 Revision 102004 Integrat ed Circuit Systems ● 525 Race Stre et, San Jo se, CA 9 5126 ● te l (40 8 ) 2 97-12 01 ● www.ics t.co m LOW COST 24 TO 36 MHZ 3.3 VOLT VCXO PRELIMINARY INFORMATION Description The ICS3727XP combines the functions of a VCXO (Voltage Controlled Crystal Oscillator) and PLL (Phase-Locked Loop) frequency doubler onto a single chip. It is designed primarily for data and clock recovery applications within end products such as set-top box receivers. The ICS3727XP exhibits a moderate VCXO gain of 200 ppm/V typical, when used with a high quality external pullable quartz crystal. The frequency of the on-chip VCXO is adjusted by an external control voltage input into pin VIN. Because VIN is a high impedance input, it can be driven directly from an PWM RC integrator circuit. Frequency output increases with VIN voltage input. The usable range of VIN is 0 to 3.3 V. Features • ICS3727XP offers 24 to 36 MHz output frequency range (output frequency = 2x crystal frequency) and improved power supply noise rejection • Uses an inexpensive 12 to 18 MHz external crystal • Ideal for DV CODEC applications using 27 MHz external pullable crystal with extended pull range to generate locked 27 MHz clock transport video clock • On-chip VCXO with guaranteed pull range of ±200 ppm minimum • VCXO input tuning voltage 0 to 3.3 V • Packaged in 8-pin SOIC (150 mil wide) Block Diagram 24-36 MHz (2x Crystal Frequency) X1 X2 Voltage Controlled Crystal Oscillator PLL Frequency Doubler VIN 12-18 MHz Pullable Crystal |
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