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.