- Buyers Guide
Hittite Microwave Corp. has launched two full-featured Fractional-N PLLs with integrated Voltage Controlled Oscillators (VCO). The HMC837LP6CE and HMC840LP6CE include a wideband, low noise VCO with auto-calibration subsystem, low noise PFD and dividers, and a precision charge-pump.
The HMC837LP6CE and HMC840LP6CE consume only 630 mW. Hittite says no other pre-packaged PLL solution is capable of reliably delivering this level of phase noise performance: -227 dBc/Hz Figure-Of-Merit (FOM) in fractional-N mode and -230 dBc/Hz FOM in integer-N mode. The integrated double side band phase noise for these products is lower than -50 dBc. The RMS jitter is less than 180 fs.
The phase detector (PD) features cycle slip prevention (CSP) technology to allow faster frequency hopping times. Ultra low in-close phase noise and low spurious also allows wider loop bandwidths for faster frequency hopping and low micro-phonics.
With common channel spacing (200 kHz, 20 kHz loop bandwidth), Spurious-Free Dynamic Range (SFDR) of 78 dB is typical. Even under worst case conditions, with the synthesizer tuned very close to an integer multiple of the comparison frequency, SFDR still exceeds 52 dB.
The HMC837LP6CE is tunable over three separate frequency bands: 1025 MHz to 1150 MHz, 2050 MHz to 2300 MHz, and 4100 MHz to 4600 MHz. The HMC840LP6CE is tunable over three separate frequency bands: 1310 MHz to 1415 MHz, 2620 MHz to 2830 MHz, and 5240 MHz to 5660 MHz.