Linear Technology announces the LTC6945, a 6GHz integer-N frequency synthesizer. The device features a -226dBc/Hz normalized closed-loop in-band phase noise, -274dBc/Hz normalized in-band 1/f noise, a wideband phase noise floor of -157dBc/Hz and -102dBc spurious output. In a typical 900MHz application, these performance attributes enable a closed-loop phase noise of -100dBc/Hz at 1kHz offset. The LTC6945, designed to work with an external low noise VCO up to 6GHz, has an on-chip output divider that is programmable from 1 through 6 to extend the tuning frequency coverage to 350MHz.
The company claims the LTC6945 comprises a low noise reference buffer, a reference divider, phase-frequency detector (PFD) with phase-locked indicator, a noise programmable charge pump and an integer feedback divider for noise PLL operation. The on-chip SPI-compatible bidirectional serial port allows frequency tuning and control, and read back of the register and loop status information.
Further, Linear Technology states the LTC6945 will enhance the performance of RF and wireless equipment, including multiband base stations supporting LTE, W-CDMA, UMTS, CDMA, multicarrier GSM and WiMAX standards. Its wide frequency range also supports point-to-point broadband wireless access, military, avionics and performance test and measurements.
The LTC6945, with full case temperature range from -40°C to 105°C, is available from stock in a 4mm x 5mm, 28-lead plastic QFN package, priced starting at $4.95 each in 1,000-piece quantities.
The PLLWizard™, a PC-based design tool software for interactive control and interface with the LTC6945’s evaluation board, can be downloaded free of charge at www.linear.com/PLLWizard.
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