Hittite announced the expansion of its clocks and timing product portfolio to include a new clock divider and delay management IC.
The HMC988LP3E provides user-selectable divider and phase adjust functions and offers leading phase noise performance as well as rise and fall times. The IC is ideal for data converter (ADC/DAC) sample clock phase alignment and backplane clock skew management functions for use in cellular infrastructure, networking, broadband and fibre-optic communications, as well as test and measurement equipment.
The HMC988LP3E can accept clock signals as high as 4 GHz which can then be divided by 1/2/4/8/16/32. It is a versatile device with two modes of phase adjustment: coarse and fine delay. Coarse adjustment allows for delay settings in increments of 1 half period of the input signal in any number of total increments desired. The fine delay adjustment, which works up to 1 GHz output frequencies, offers output phase control with 20 ps resolution in 60 steps.
Additional timing functions include clock synchronisation, 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 a flexible input which can be optimised for LVPECL, LVDS, CML or CMOS signals.
The phase noise floor of -170 dBc/Hz, 80 ps rise and fall times, and 20 ps phase adjustment resolution make the device well suited to driving ADCs, DACs and sample-and-hold amplifiers, minimising the affects of aperture jitter. Fine timing adjustment is also advantageous in test and measurement, as well as clock recovery applications.
The device also features an optional on-chip power supply regulator with 85 dB PSRR, which improves performance in noisier power supply conditions and helps reduce power supply filtering requirements.
Up to eight addressable HMC988LP3E ICs can be used together on an SPI bus, and each device operates from a +3,3 V supply, or a +5 V supply if the optional on-chip regulator is utilised. The lowest power supply current configuration of the device draws only 68 mA of supply current under typical conditions. It is housed in a 3 x 3 mm SMT QFN package.
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