Ultralow noise 373-MHz to 5.79-GHz Integer-N synthesizers feature integrated VCO to boost system performance

Ultralow noise 373-MHz to 5.79-GHz Integer-N synthesizers feature integrated VCO to boost system performance

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By eeNews Europe

In a typical 900 MHz application, these performance attributes help to achieve a closed-loop phase noise of -100 dBc/Hz at 1 kHz offset. The LTC6946 is available in three frequency options: the LTC6946-1 tunes from 2.240 GHz to 3.740G Hz; the LTC6946-2 from 3.080 GHz to 4.910 GHz; and the LTC6946-3 covers 3.840 GHz to 5.790 GHz. In addition, each part has an on-chip output divider that is programmable from 1 through 6 to extend frequency coverage to as low as 373 MHz.

The new family of devices integrates a low noise 5.7 GHz phase-locked loop (PLL), which includes a reference divider, phase-frequency detector (PFD) with phase-locked indicator, ultralow noise charge pump, and integer feedback divider to attain very low noise PLL operation. The PLL circuit is tightly coupled to a low noise VCO as well as internal self-calibration to ensure optimum VCO resonator tuning for best phase noise performance. The VCO requires no external components. The on-chip SPI compatible bidirectional serial port allows frequency tuning and control, and read back of register and loop status information.

The low phase noise and spurious capabilities of this family of frequency synthesizers enhance the performance of multiband basestations supporting LTE, W-CDMA, UMTS, CDMA, GSM and WiMAX standards. Its high frequency capability also supports point-to-point broadband wireless access, military, avionics, and high performance test and measurement applications.

The PLLWizard comprehensive PC-based design tool software is available to facilitate interactive control and interface with the LTC6946’s evaluation board. Designers can perform simulations and optimization with the PLLWizard software, and then interactively verify their designs on the actual demonstration circuit. The PLLWizard design tool software is available for download free of charge from the Linear Technology website at

All versions of the LTC6946 are specified over the full case temperature range from -40 to 105°C. The products are available in a 4 mm x 5 mm, 28-lead plastic QFN package.

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