The MK3725 is a low cost, high-performance, two output 3.3 Volt VCXO and PLL clock synthesizer designed to replace expensive VCXOs and crystals. 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 115 ppm minimum. Using our analog Phase Locked Loop (PLL) techniques, the device uses an external, fundamental mode pullable crystal input to produce output clocks of 2x the input frequency.