TI's 500 MHz to 14 GHz wideband, low-noise fractional-N PLL with ramp/chirp generation
Texas Instruments' LMX2492/92-Q1 is a low-noise 14 GHz wideband delta-sigma fractional-N PLL with ramp and chirp generation. It consists of a phase frequency detector, programmable charge pump, and high-frequency input for the external VCO. The LMX2492/92-Q1 supports a broad and flexible class of ramping capabilities, including FSK, PSK, and configurable piecewise linear FM modulation profiles of up to 8 segments. It supports fine PLL resolution and fast ramp with up to a 200 MHz phase detector rate. The LMX2492/92-Q1 allows any of its registers to be read back. The LMX2492/92-Q1 can operate with a single 3.3 V supply. Moreover, supporting up to 5.25 V charge pump can eliminate the need of an external amplifier, leading to a simpler solution with improved phase-noise performance.