Industry’s 'lowest power' wideband RF synthesiser

Posted By : Nat Bowers
Industry’s 'lowest power' wideband RF synthesiser

Claimed to be the industry’s lowest power wideband RF synthesiser, the LMX2571 from Texas Instruments integrates an ultra-low-noise PLLatinum fractional-N PLL with a multicore VCO. This enables enabling low phase noise and spurs at only 39mA (128mW) and a PLL noise figure-of-merit of -231dBc/Hz, which is eight times better than the competition and enhances receiver sensitivity.

The LMX2571 enhances radio sensitivity and dynamic range for applications up to 1.34GHz such as low-power wireless communication, handheld oscilloscopes and signal analysers. An integrated frequency modulator enables the user to directly modulate the carrier to produce analogue Frequency Modulation (FM) or Frequency-Shift-Keying (FSK), benefiting portable wireless applications such as land mobile radios, software-defined radios and wireless microphones. An integrated FSK modulator with an easy-to-use I2S interface provides flexibility and performance.

The LMX2571 is also claimed to be the first RF synthesiser in the industry with an integrated feature to remove integer boundary spurs, allowing designers to eliminate spurious emissions and maximise use of radio channels in their wireless systems. The device also inetgrates LDOs, a 5V charge pump and a fast transmit/receive switch which reduce the BOM and solution footprint.

Engineers can quickly and easily evaluate the performance of the LMX2571 RF synthesiser with the LMX2571EVM evaluation module, available now for $249.

TI's WEBENCH Clock Architect online design tool simplifies the design process for the LMX2571. It can recommend a single- or multiple-device clock tree solution from a broad database of devices to meet system requirements and features PLL loop filter design, phase noise simulation and the ability for designers to optimise clock tree design for their performance and cost requirements.

Support is also available in the TI E2E Community Clocks and Timing forum, where engineers can search for solutions, get help, share knowledge and solve problems with fellow engineers and TI experts.

The LMX2571 PLLatinum RF synthesiser is available today in a 6x6mm QNF package for $5.50 in 1,000 unit quantities.


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