LMX2572LP - 2-GHz Low Power Wideband RF Synthesizer With FSK Modulation

The LMX2572LP is a low-power, high-performance widebandsynthesizer that can generate one frequency from 12.5 MHz to 2 GHz without the use of an internal doubler. The PLLdelivers excellent performance while consuming just 70 mA from a single 3.3-V supply.

For applications like digital mobile radio (DMR) and wireless microphones, theLMX2572LP supports FSK modulation. Discrete level FSK andpulse-shaping FSK are supported. Direct digital FSK modulation is achievable through programming orpins.

The LMX2572LP allows users to synchronize the output ofmultiple devices and also enables applications that need deterministic delay between input andoutput. The LMX2572LP provides an option to adjust the phase withfine granularity to account for delay mismatch on the board or within devices. A frequency rampgenerator can synthesize up to two segments of ramp in an automatic ramp generation option or amanual option for maximum flexibility. The fast calibration algorithm allows the user to changefrequencies faster than 20 µs.

The LMX2572LP integrates LDOs from a single 3.3-V supply,thus eliminating the need for onboard low-noise LDOs.

• Output Frequency: 12.5 MHz to 2 GHz
• Low Power Consumption: 70 mA at 3.3-V Supply
• –124-dBc/Hz Phase Noise at 100-kHz Offset With 800-MHz Carrier
• PLL Figure of Merit: –232 dBc/Hz
• PLL Normalized 1/f Noise: –123.5 dBc/Hz
• 32-Bit Fractional-N Divider
• Remove Integer Boundary Spurs With Programmable Input Multiplier
• Synchronization of Output Phase Across Multiple Devices
• Support for Ramp and Chirp Functions
• Support for FSK Direct Digital Modulation
• Two Programmable Output Power Level Differential Outputs
• Fast VCO Calibration Speed: < 20 µs
• Single 3-V to 3.5-V Power Supply

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