1 Features

1• Output frequency: 12.5 MHz to 6.4 GHz

• Low power consumption: 75 mA at 3.3-V supply

• –106-dBc/Hz Phase noise at 100-kHz offset with

6.4-GHz 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 JESD204B SYSREF with

programmable delay

• 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

• RADAR

• High-speed data converter clocking

3 Description

The LMX2572 is a low-power, high-performance

wideband synthesizer that can generate any

frequency from 12.5 MHz to 6.4 GHz without using an

internal doubler. The PLL delivers excellent

performance while consuming just 75 mA from a

single 3.3-V supply.

For applications like digital mobile radio (DMR) and

wireless microphones, the LMX2572 supports FSK

modulation. Discrete level FSK and pulse-shaping

FSK are supported. Direct digital FSK modulation is

achievable through programming or pins.

The LMX2572 allows users to synchronize the output

of multiple devices and also enables applications that

need deterministic delay between input and output.

The LMX2572 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 LMX2572 also supports

generating or repeating SYSREF (compliant to

JESD204B standard) making it an ideal low-power,

low-noise clock source for clocking high-speed data

converters. Fine delay adjustment is provided in this

configuration to account for delay differences of board

traces.

The LMX2572 integrates LDOs from a single 3.3-V

supply, thus eliminating the need for onboard lownoise

LDOs.