LMX2492 - 500MHz to 14GHz Wideband, Low Noise Fractional N PLL With Ramp/Chirp Generation

The 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 external amplifier, leading to a simpler solution with improved phase noise performance.

• –227 dBc/Hz Normalized PLL Noise
• 500 MHz – 14 GHz Wideband PLL
• 3.15 – 5.25 V Charge Pump PLL Supply
• Versatile Ramp / Chirp Generation
• 200 MHz Max Phase Detector Frequency
• FSK / PSK Modulation Pin
• Digital Lock Detect
• Single 3.3 V Supply Capability
• Automotive 125°C Q100 Grade 1 Qualification
• Non-Automotive (LMX2492) Option