描述 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 .

特性 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.