LMX2571NJKT

The LMX2571 is a low-power, high-performance, wideband PLLatinum™ radio frequency (RF) synthesizer that integrates a Δ-Σ fractional-N PLL, a multi-core voltage-controlled oscillator (VCO), a programmable output divider, and two output buffers. The VCO core operates at frequencies up to 5.376 GHz, with a continuous output frequency range from 10 MHz to 1344 MHz. The synthesizer can also be used with an external VCO. In this configuration, a dedicated 5V charge pump and output divider are required. The synthesizer also includes a unique programmable multiplier that helps eliminate glitches, allowing the system to use either channel even if the glitches fall on integer boundaries. Its output features an SPDT switch that can be used as a transmit/receive switch in FDD radio applications. Two switches can be turned on simultaneously to provide dual outputs. The LMX2571 supports direct digital FSK modulation through programming or corresponding pins. The device supports discrete-level FSK, pulse-shaped FSK, and analog FM modulation. The device uses a new FastLock technology that enables users to switch from one frequency to another in less than 1.5 ms, even when an external VCO is used with a narrowband loop filter.