The Epson VG-4513CB uses a high-frequency fundamental crystal to achieve output frequencies up to 500 MHz with no spurs and very low phase noise and low jitter.
The company said its new device is 87% smaller than existing VCXOs. It can deliver output frequencies up to 500 MHz without using a PLL or frequency multiplier.
http://www5.epsondevice.com/en/quartz/index.html