Chelmsford, MA — Hittite Microwave Corporation has released three ultra low phase noise synthesizer ICs for use in cellular, broadband, microwave radio, satellite and military applications that operate at frequencies up to 9 GHz. These innovative integer-N and fractional-N synthesizers are an ideal choice for use in transceiver infrastructure, test and measurement or military radio systems where ultra low phase noise and fast frequency switching is paramount.
The HMC700LP4E is a 8 GHz Fractional-N synthesizer IC (9 GHz Integer mode) that features a 16-bit fractional divider, 24-bit delta-sigma modulator, 14-bit reference path divider, ultra low noise phase frequency detector (PFD), a precision controlled charge pump as well as extensive access to various modes of operation via a read/writable serial port. An ideal choice for PLL architectures, this designer friendly part achieves typical phase noise performance of -108 dBc/Hz with Figures of Merit (FOM) on the order of -227 dBc. Reference spurious levels are less than -130 dBc and in-band fractional boundary spurious are typically well below the integrated phase noise. Additional features include cycle slip prevention (CSP) which is a mode that allows faster frequency hopping than conventional PLLs. The device can also alter its output phase in ultra fine micro degree steps, and is capable of direct FSK modulation.
The HMC698LP5E and HMC699LP5E are 7 GHz Integer-N synthesizer ICs with wideband reversible polarity digital PFDs and lock detect outputs. The integrated dividers operate unconditionally from 80 to 7000 MHz with a continuous integer division ratio of N=12 to 259 and N=56 to 519 respectively. Input reference frequencies can be as high as 1300 MHz and single sideband phase noise is measured at -153 dBc/Hz at10 kHz offset from a 100 MHz, 0 dBm signal. The high frequency operation of these two ICs along with ultra low phase noise floor make possible synthesized signal generation with wide loop bandwidth and low N, resulting in signals with fast settling, low spurious and very low phase noise.
All three devices are conveniently housed in 5-x 5-mm and 4- x 4-mm RoHS compliant QFN leadless packages and are specified for operation over -40 to +85 degrees Celsius. Samples and evaluation boards for all SMT packaged products are available.
A datasheet is available.
For further information visit www.hittite.com.
