2-GHz low power wideband RF synthesizer with FSK modulation


Product details


Integrated VCO Yes Output frequency (Min) (MHz) 12.5 Output frequency (Max) (MHz) 2000 Normalized PLL phase noise (dBc/Hz) -232 Current consumption (mA) 70 1/f noise (10-kHz offset at 1-GHz carrier) (dBc/Hz) -123.5 open-in-new Find other RF PLLs & synthesizers

Package | Pins | Size

VQFN (RHA) 40 36 mm² 6 x 6 open-in-new Find other RF PLLs & synthesizers


  • 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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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 low-noise LDOs.

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Technical documentation

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Type Title Date
* Data sheet LMX2572LP 2-GHz Low Power Wideband RF Synthesizer With FSK Modulation datasheet May 24, 2018
Application note LMX2571 Using a Programmable Input Multiplier to Minimize Integer Boundary Spurs Jan. 12, 2016

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide
This Evaluation Module (EVM) is for the LMX2572LP, which is a low-power high-performance wideband synthesizer that can generate any frequency from 12.5 MHz to 2 GHz without using an internal doubler. The PLL delivers excellent performance while consuming just 70 mA from a single 3.3-V supply. By (...)
  • 12.5-MHz to 2-GHz output frequency 
  • -124 dBc/Hz Phase noise at 100-kHz offset with 800-MHz carrier
  • 70-mA operation current with one direct VCO output
  • Two differential outputs with programmable output power
  • This EVM has the complete circuit for the synthesizer, optimized and tested for performance, and (...)

Software development

Texas Instruments PLLatinum Simulator Tool
PLLATINUMSIM-SW The PLLATINUMSIM-SW simulator tool lets you create detailed designs and simulations of our PLLATINUM™ integrated circuits which include the LMX series of PLLs and synthesizers.
  • Part selection based on current, cost, phase noise and package
  • Filter design up for passive and active filters up to 4th-order
  • Simulation of phase noise including PLL, fractional engine, voltage-controlled oscillator (VCO), input, dividers, and loop filter
  • Simulation of spurs including phase detector (...)
Texas Instruments Clocks and Synthesizers (TICS) Pro Software
TICSPRO-SW The TICS Pro software is used to program the evaluation modules (EVMs) for device numbers with these prefixes: CDC, LMK and LMX. These devices include PLLs and voltage-controlled oscillators (PLL+VCO), synthesizers and clocking devices.
  • Program EVMs through the USB2ANY Interface Adaptor or onboard USB interface.
  • Export programming configurations for use in end application.

Design tools & simulation

Clock tree architect programming software
CLOCK-TREE-ARCHITECT Clock tree architect is a clock tree synthesis tool that streamlines your design process by generating clock tree solutions based on your system requirements. The tool pulls data from an extensive database of clocking products to generate a system-level multi-chip clocking solution.
  • Accepts customer specific design requirements such as input frequencies, output frequencies, clock formats and clock counts
  • Generates clock trees by taking into account a variety of advanced specifications, such as noise floor and phase determinism requirements
  • Presents clear and intuitive block (...)

CAD/CAE symbols

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VQFN (RHA) 40 View options

Ordering & quality

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