Hittite has launched two new SMT packaged wideband PLLs (phase locked loops) with integrated VCOs - the HMC833LP6GE and the HMC834LP6GE. The devices are well suited for a wide range of applications including high-performance cellular/4G WiMax infrastructure, repeaters and femtocells, communications test equipment, CATV equipment, very high data rate radios, phased array and DDS replacement applications.
The HMC833LP6GE is a low-noise, wideband, fractional-N PLL that features an integrated VCO (voltage controlled oscillator) with a fundamental frequency of 1500 MHz–3000 MHz, and an integrated VCO output divider (divide by 1/2/4/6.../60/62) and doubler. These features allow it to generate frequencies from 25 MHz to 6000 MHz.
The HMC834LP6GE features an integrated VCO with a fundamental frequency of 2800 MHz–4200 MHz, and an integrated VCO output divider (divide by 1/2/4/6.../60/62) and doubler, that together allow it to generate frequencies from 45 MHz to 1050 MHz, from 1400 MHz to 2100 MHz, from 2800 MHz to 4200 MHz, and from 5600 MHz to 8400 MHz.
The devices feature excellent phase noise and spurious performance across all frequencies, which minimises blocker effects and improves receiver sensitivity and transmitter spectral purity. The noise floor of less than -170 dBc/Hz makes them ideal for a variety of applications such as LO for RF mixers, a clock source for high-frequency data-converters, or a tuneable reference source for ultra-low spurious applications.
The HMC833LP6GE and the HMC834LP6GE also feature 9 dB of programmable RF output power control (3 dB steps) and an output mute function with over 40 dB of isolation across the entire operating frequency range. Both devices feature an ‘exact frequency mode’ that enables users to generate output frequencies with 0 Hz frequency error. An integrated phase detector feature and a delta-sigma modulator, which is capable of operating up to 100 MHz, enable wider loop-bandwidths with excellent spectral performance.
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