MK3720

MK3720 27 MHz and 54 MHz 3.3 Volt VCXO Description The MK3720 is a low cost, low jitter, high performance 3.3 Volt VCXO and PLL clock synthesizer designed to replace expensive 13.5, 27, or 54MHz VCXOs. The patented on-chip Voltage Controlled Crystal Oscillator accepts a 0 to 3.3 V input voltage to cause the output clocks to vary by ±100 ppm. Using our patented VCXO and analog/digital Phase-Locked Loop (PLL) techniques, the device uses an inexpensive external 13.5 MHz pullable crystal input to produce output clocks of 13.5 MHz, 27 MHz, and 54 MHz . The MK3720A is a drop-in replacement to the earlier MK3720S. Features Packaged in 8 pin SOIC 3.3 V only operating voltage Output clocks of 54, 27, and 13.5MHz Uses an inexpensive 13.500 MHz external crystal On-chip patented VCXO with pull range of 200ppm (minimum) VCXO tuning voltage of 0 to 3.3 V 12 mA output drive capability at TTL levels Advanced, low power, sub-micron CMOS process The A version is the latest, manufactured in a smaller geometry process. The MK3720A gives a wider pull range than the MK3720S, and so is recommended for all new designs, and cost reductions of existing designs. Block Diagram VIN 13.5 MHz pullable crystal X1 Output Buffer Voltage Controlled Crystal Oscillator PLL/Clock Synthesis Circuitry Output Buffer Output Buffer 54 MHz Clock 27 MHz Clock 13.5 MHz Clock X2 1 Revision 053100 Printed 11/16/00 Integrated Circuit Systems, Inc. 525 Race Street San Jose CA 95126 (408)295-98...