Hittite offers clock divider and delay management IC

MMIC-based chip vendor Hittite Microwave Corp. has expanded its clocks and timing line with the HMC988LP3E clock divider and delay management IC.

MMIC-based chip vendor Hittite Microwave Corp. has expanded its clocks and timing line with the HMC988LP3E clock divider and delay management IC.

The HMC988LP3E clock divider and delay management IC is designed to provide user-selectable divider and phase adjust functions with best-in-class phase noise performance and rise and fall times, Hittite asserts. It accepts clock signals as high as 4 GHz and divides them by 1/2/4/8/16 and /32. The device is targeted at data converter (ADC/DAC) sample clock phase alignment and backplane clock skew management functions for such applications as networking, broadband, fiber-optic communications, cellular infrastructure, and test and measurement equipment.

The clock divider and delay management IC offers both coarse and fine delay phase-adjustment modes. Coarse adjustment enables delay settings in increments of one half-period of the input signal in any number of desired total increments. The fine delay adjustment, which works up to 1-GHz output frequencies, offers output phase control with 20-ps resolution in 60 steps. This feature particularly can benefit test and measurement and clock recovery applications.

Additional timing functions include clock synchronization, clock invert, and clock slip options, which provide a wide variety of phase control for data converter sample clocks. The HMC988LP3E features a standard differential LVPECL output and an input that designers can optimize for LVPECL, LVDS, CML, or CMOS signals. The device also features an optional on-chip power supply regulator with 85-dB PSRR. This feature improves performance in noisier power supply conditions and helps reduce power supply filtering requirements, according to Hittite.

The phase noise floor of -170dBc/Hz, 80-ps rise and fall times, and 20-ps phase adjustment resolution minimize the effects of aperture jitter in such applications as driving ADCs, DACs, and sample and hold amplifiers, Hittite says.

Up to 8 addressable HMC988LP3E devices can be used together on a SPI bus, and each device operates from a +3.3-V supply or a +5-V supply if the optional on-chip regulator is used. The lowest power supply current configuration of the HMC988LP3E draws 68 mA of supply current under typical conditions. It is housed in a 3x3-mm SMT QFN package.

Samples and evaluation PC boards for all SMT packaged products are available from stock.

For more information on communications ICs and suppliers, visit the Lightwave Buyer’s Guide.

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