LMX2541

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Ultra-low noise PLLatinum frequency synthesizer with integrated VCO

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Product details

Parameters

Integrated VCO Yes Output frequency (Min) (MHz) 32 Output frequency (Max) (MHz) 4000 Normalized PLL phase noise (dBc/Hz) -226 Current consumption (mA) 120 1/f noise (10-kHz offset at 1-GHz carrier) (dBc/Hz) -125 open-in-new Find other RF PLLs & synthesizers

Features

  • Multiple Frequency Options Available
    (See Device Comparison Table)
  • Frequencies from 31.6 MHz to 4000 MHz
  • Very Low RMS Noise and Spurs
  • –225 dBc/Hz Normalized PLL Phase Noise
  • Integrated RMS Noise (100 Hz – 20 MHz)
    • 2 mRad (100 Hz – 20 MHz) at 2.1 GHz
    • 3.5 mRad (100 Hz - 20 MHz) at 3.5 GHz
  • Ultra Low-Noise Integrated VCO
  • External VCO Option (Internal VCO Bypassed)
  • VCO Frequency Divider 1 to 63 (all values)
  • Programmable Output Power
  • Up to 104-MHz Phase Detector Frequency
  • Integrated Low-Noise LDOs
  • Programmable Charge Pump Output
  • Partially Integrated Loop Filter
  • Digital Frequency Shift Keying (FSK) Modulation Pin
  • Integrated Reference Crystal Oscillator Circuit
  • Hardware and Software Power Down
  • FastLock Mode and VCO-Based Cycle Slip Reduction
  • Analog and Digital Lock Detect
  • 1.6-V Logic Compatibility
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Description

The LMX2541 is an ultra low-noise frequency synthesizer which integrates a high performance delta-sigma fractional N PLL, a VCO with fully integrated tank circuit, and an optional frequency divider. The PLL offers an unprecedented normalized noise floor of -225 dBc/Hz and can be operated with up to 104 MHz of phase-detector rate (comparison frequency) in both integer and fractional modes. The PLL can also be configured to work with an external VCO.

The LMX2541 integrates several low-noise, high precision LDOs and output driver matching network to provide higher supply noise immunity and more consistent performance, while reducing the number of external components. When combined with a high quality reference oscillator, the LMX2541 generates a very stable, ultra low-noise signal.

The LMX2541 is offered in a family of 6 devices with varying VCO frequency range from 1990 MHz up to 4 GHz. Using a flexible divider, the LMX2541 can generate frequencies as low as 31.6 MHz.

The LMX2541 is a monolithic integrated circuit, fabricated in a proprietary BiCMOS process. Device programming is facilitated using a three-wire MICROWIRE interface that can operate down to 1.6 volts. Supply voltage ranges from 3.15 V to 3.45 V. The LMX2541 is available in a 36-pin 6-mm × 6-mm × 0.8-mm WQFN Package.

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Technical documentation

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Type Title Date
* Data sheet LMX2541 Ultra-Low Noise PLLatinum Frequency Synthesizer With Integrated VCO datasheet (Rev. J) Dec. 31, 2014
User guide LMX2541xxxx Evaluation Board User's Guide (Rev. B) Oct. 06, 2014

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
399
Description

The LMX2541 Evaluation Board simplifies the evaluation of the LMX2541 device. There is a different evaluation board for each option of the LMX2541 device, but they all use the same instructions and software.

EVALUATION BOARD Download
document-generic User guide
399
Description

The LMX2541 Evaluation Board simplifies the evaluation of the LMX2541 device. There is a different evaluation board for each option of the LMX2541 device, but they all use the same instructions and software.

EVALUATION BOARD Download
document-generic User guide
399
Description

The LMX2541 Evaluation Board simplifies the evaluation of the LMX2541 device. There is a different evaluation board for each option of the LMX2541 device, but they all use the same instructions and software.

EVALUATION BOARD Download
document-generic User guide
399
Description

The LMX2541 Evaluation Board simplifies the evaluation of the LMX2541 device. There is a different evaluation board for each option of the LMX2541 device, but they all use the same instructions and software.

EVALUATION BOARD Download
document-generic User guide
399
Description

The LMX2541 Evaluation Board simplifies the evaluation of the LMX2541 device. There is a different evaluation board for each option of the LMX2541 device, but they all use the same instructions and software.

Software development

APPLICATION SOFTWARE & FRAMEWORK Download
Clock Design Tool - Loop Filter & Device Configuration + Simulation
CLOCKDESIGNTOOL The Clock Design Tool software helps with part selection, loop filter design and simulation of timing device solutions. When you enter desired output frequencies and a reference frequency (optional), the tool provides TI devices to meet the specified requirements, divider values and a recommended (...)
APPLICATION SOFTWARE & FRAMEWORK Download
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.
Features
  • 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 (...)
APPLICATION SOFTWARE & FRAMEWORK Download
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.
Features
  • Program EVMs through the USB2ANY Interface Adaptor or onboard USB interface.
  • Export programming configurations for use in end application.
IDE, CONFIGURATION, COMPILER OR DEBUGGER Download
CodeLoader Software for device register programming
CODELOADER The CodeLoader 4 software is used to program the LMX PLLs and LMK timing devices through either the USB or line print terminal (LPT) port of a computer. This software also provides information on how to program the device by showing the bits that are actually sent.


Which software do I use?

Product

Loop (...)

Design tools & simulation

SIMULATION MODEL Download
SNOM472.ZIP (40 KB) - IBIS Model
DESIGN TOOL Download
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.
Features
  • 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

Package Pins Download
(NJK) 36 View options

Ordering & quality

Information included:
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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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