LMX2571NJKT

The LMX2571NJKT from Texas Instruments is a wideband PLLatinum RF synthesizer designed for high performance and low power consumption. It integrates a delta-sigma fractional N PLL, multiple core voltage-controlled oscillators (VCOs), and programmable output dividers.

This synthesizer offers a continuous output frequency range from 10 MHz to 1344 MHz. Key electrical specifications include a normalized PLL phase noise floor of -231 dBc/Hz and 1/f noise of -124 dBc/Hz at a 10-kHz offset from a 1-GHz carrier. It also features low phase noise and spurs, with values like -123 dBc/Hz at a 12.5 kHz offset and -145 dBc/Hz at a 1 MHz offset at 480 MHz. Spurious performance is better than -75 dBc/Hz.

The LMX2571NJKT supports direct digital FSK modulation with 2-, 4-, and 8-level or arbitrary level modulation. It has a typical current consumption of 39 mA in synthesizer mode with the internal VCO. The device operates over an extreme temperature range of -40°C to 85°C.

Packaged in a 36-WQFN (6x6 mm) with an exposed pad, the LMX2571NJKT is designed for surface mount applications. It requires an operating voltage between 3.15V and 3.45V. The device features a 24-bit fractional-N delta-sigma modulator and can accept crystal, XO, or differential reference clock inputs.