Hittite Microwave Corporation has announced the release of a new PLL chip set. The HMC983LP5E DC to 7 GHz Fractional-N divider and frequency sweeper and the HMC984LP4E digital phase-frequency detector and charge pump are targeted for PLL and frequency modulated continuous wave (FMCW) sweeper applications.
The HMC983LP5E integrates a programmable 48-bit Delta-Sigma Modulator which allows the combined PLL to achieve fractional frequency resolution of 180 nHz. A built-in frequency sweeper helps generate identical, coherent, FMCW sweeps that can be linear, user-defined, automatic or triggered.
The HMC984LP4E provides a low noise phase detector and charge pump capable of operating at high phase detector frequencies of 125 MHz in fractional mode, and 175 MHz in integer mode. The company states that the PLL chip set’s wider loop bandwidths result in better phase noise performance, faster PLL locking times, and faster frequency sweeps. The PLL chip set phase noise Figure of Merit performance is -231 dBc/Hz in integer mode and -227 dBc/Hz in fractional mode.
Hittite further claims that the HMC983LP5E and the HMC984LP4E can be used in stand-alone applications, but partitioning the PLL building blocks achieves isolation and spurious emissions performance exceeding -60 dBc/Hz inside the loop bandwidth. Both are housed in plastic leadless surface mount packages for temperature stability over the -40 °C to 85 °C operating range.
Samples and evaluation PC boards for all SMT packaged products are available from stock and can be ordered via the company’s e-commerce site or via direct purchase order.
For released data sheets: