1 Features
1• 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

2 Applications
• Test and Measurement Equipment
• Digital 2-Way Radios
• Low Power Radio Communication Systems
• Satellite Communication
• Wireless Microphones
• Propriety Wireless Connectivity
• MIMO
• High-Speed Data Converter Clocking

3 Description
The LMX2572LP is a low-power, high-performance
wideband synthesizer that can generate one
frequency from 12.5 MHz to 2 GHz without the use of
an internal doubler. The PLL delivers excellent
performance while consuming just 70 mA from a
single 3.3-V supply.
For applications like digital mobile radio (DMR) and
wireless microphones, the LMX2572LP supports FSK
modulation. Discrete level FSK and pulse-shaping
FSK are supported. Direct digital FSK modulation is
achievable through programming or pins.
The LMX2572LP allows users to synchronize the
output of multiple devices and also enables
applications that need deterministic delay between
input and output. The LMX2572LP provides an option
to adjust the phase with fine granularity to account for
delay mismatch on the board or within devices. A
frequency ramp generator can synthesize up to two
segments of ramp in an automatic ramp generation
option or a manual option for maximum flexibility. The
fast calibration algorithm allows the user to change
frequencies faster than 20 μs.
The LMX2572LP integrates LDOs from a single 3.3-V
supply, thus eliminating the need for onboard lownoise
LDOs.