Microwave Journal

Clock Generators: HMC1032LP6GE / HMC1034LP6GE

January 18, 2012

HMC1032LP6GEHittite Microwave Corp., a supplier of complete MMIC-based solutions for communication and military markets, has launched two SMT packaged clock generators, the HMC1032LP6GE and the HMC1034LP6GE. These devices are ideal for a wide range of cellular/4G infrastructure, fiber optic and networking applications

The HMC1032LP6GE and the HMC1034LP6GE offer programmable frequency synthesis from 125 MHz to 3 GHz in both integer- and fractional-N relationships to their reference clocks. The HMC1032LP6GE is ideal for clocking DSP, FPGA and high-performance processors, and operates from 125 to 350 MHz, while the HMC1034LP6GE is designed to meet the stringent requirements of high speed data converters and physical layer devices (PHY), and operates from 125 MHz to 3 GHz. The devices integrate PLL and VCO circuits and an advanced delta-sigma modulator with 24-bit step range that enables frequency resolution of 3 Hz and below. The serial programming interface (SPI), and Hittite’s easy-to-use configuration software allows for programming frequencies rapidly. A proprietary ‘Exact Frequency Mode’ of operation reduces frequency errors in fractional-N synthesis mode while maintaining the excellent noise and spur performance of the device.

The HMC1034LP6GE clock generator achieves a phase jitter performance of 78 fs RMS typical (12 kHz to 20 MHz integration bandwidth) when operating at 800 MHz, and improves link level jitter performance, interface bit-error-rates (BER) and eye diagram metrics. The device is ideal for low noise clock multiplication in networking, data center and storage applications.

The HMC1032LP6GE and the HMC1034LP6GE may be used to generate the sample clocks for high speed data converters (ADCs and DACs) in cellular infrastructure and fiber optic applications. With a phase noise floor of less than -165 dBc/Hz, the clock generators improve the signal-to-noise-ratio (SNR) performance of data converters by providing very clean sample and device clocks. Both devices provide an AC coupled, differential clock pair with two-bit adjustable output amplitude, and an output mute function, which may be set via the SPI interface. The HMC1032LP6GE and the HMC1034LP6GE clock generators expand Hittite’s clocks and timing product family, which also includes the recently released HMC987LP5E 1:9 fanout buffer with LVPECL signaling.

The HMC1032LP6GE and the HMC1034LP6GE are each assembled in 6 x 6 mm plastic leadless surface-mount packages, and support operation over the -40° to +85°C temperature range. Evaluation kits with easy-to-use USB programming capability and GUI-based programming software to set the desired register configuration are available from Hittite.

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