Phase Frequency Detectors
Hittite introduces two HBT Digital Phase-Frequency Detectors (PFD) intended for use in low noise, Phase Lock Loop (PLL) applications for inputs from 10 to 1300 MHz. Synthesizer designers can choose either the HMC439QS16G single Function PFD or the HMC440QS16G PFD with an integrated DC to 2800 MHz 5-Bit counter. The counter offers continuous division from 2 to 32. Both products are housed in a plastic SMT 16-lead QSOP packages that have an exposed base for excellent RF and thermal performance. Combining an operating frequency of 10 to 1300 MHz, along with an SSB phase noise floor of 153 dBc / Hz @ 10 kHz offset, both the HMC439QS16G and the HMC440QS16G make synthesizers with wide loop bandwidth and low N possible. When used in conjunction with a differential loop amplifier, both PFDs generate an output voltage of 2Vpk-pk typical that can be used to phase lock a VCO to a reference oscillator.
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