Technology Front
New Clock and Timing Chip with 14-GHz Fractional-N PLL
Published: Jun 10,201424 Read
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.
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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.
Features:
－ -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
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