LMX2491 Texas instruments

LMX2491

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LMX2491

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Описание

The LMX2491 device is a low-noise, 6.4-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 LMX2491 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 LMX2491 allows any of its registers to be read back. The LMX2491 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 to 6.4-GHz Wideband PLL
3.15-V to 5.25-V Charge Pump PLL Supply
Versatile Ramp / Chirp Generation
200-MHz Maximum Phase Detector Frequency
FSK / PSK Modulation Pin
Digital Lock Detect
Single 3.3-V Supply Capability

Integrated VCO	No
Output frequency (min) (MHz)	500
Output frequency (max) (MHz)	6400
Normalized PLL phase noise (dBc/Hz)	-227
Current consumption (mA)	60
Features	Flexible ramp generation, Wideband
1/f noise (10-kHz offset at 1-GHz carrier) (dBc/Hz)	-120
Rating	Catalog
Operating temperature range (°C)	-40 to 85
Lock time (µs) (typ)	Loop BW dependent