LMX2531

WQFN (NJG)

36

36 mm² 6 x 6

WQFN (NJH)

36

36 mm² 6 x 6

Multiple Frequency Options Available
- See Device Information Table
- Frequencies From: 553 MHz to 3132 MHz
PLL Features
- Fractional-N Delta-Sigma Modulator Order
  Programmable up to Fourth Order
- FastLock/Cycle Slip Reduction with Timeout
  Counter
- Partially Integrated, Adjustable Loop Filter
- Very Low Phase Noise and Spurs
VCO Features
- Integrated Tank Inductor
- Low Phase Noise
Other Features
- 2.8-V to 3.2-V Operation
- Low Operating Current
- Low Power-Down Current
- 1.8-V MICROWIRE Support
- 36-Pin 6-mm × 6-mm × 0.8-mm WQFN Package

Multiple Frequency Options Available
- See Device Information Table
- Frequencies From: 553 MHz to 3132 MHz
PLL Features
- Fractional-N Delta-Sigma Modulator Order
  Programmable up to Fourth Order
- FastLock/Cycle Slip Reduction with Timeout
  Counter
- Partially Integrated, Adjustable Loop Filter
- Very Low Phase Noise and Spurs
VCO Features
- Integrated Tank Inductor
- Low Phase Noise
Other Features
- 2.8-V to 3.2-V Operation
- Low Operating Current
- Low Power-Down Current
- 1.8-V MICROWIRE Support
- 36-Pin 6-mm × 6-mm × 0.8-mm WQFN Package

The LMX2531 is a low-power, high-performance frequency synthesizer system which includes a fully integrated delta-sigma PLL and VCO with fully integrated tank circuit. The third and fourth poles are also integrated and adjustable. Ultra-low noise and high-precision LDOs are integrated for the PLL and VCO, which yield higher supply-noise immunity and more consistent performance. When combined with a high-quality reference oscillator, the LMX2531 device generates very stable, low-noise local-oscillator signals for up and down conversion in wireless communication devices. The LMX2531 device is a monolithic integrated circuit, fabricated in an advanced BiCMOS process. Several different versions of this product accommodate different frequency bands.

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Technical documentation

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	Type	Title	Date
*	Data sheet	LMX2531 High-Performance Frequency Synthesizer System With Integrated VCO datasheet (Rev. S)	31 Dec 2014
	Application note	AN-1879 Fractional N Frequency Synthesis (Rev. B)	18 Nov 2021
	User guide	LMX2531-xxxx Evaluation Board User’s Guide (Rev. A)	26 Nov 2013
	Application note	AN-1558 Clocking High-Speed A/D Converters (Rev. B)	01 May 2013
	Application note	AN-1821 CPRI Repeater System (Rev. A)	26 Apr 2013
	Application note	Selecting Amplifiers, ADCs, and Clocks for High-Performance Signal Paths	13 Sep 2007
	Application note	Generating Precision Clocks for Time- Interleaved ADCs	02 Aug 2007

Design & development

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

Evaluation board

LMX25311226EVAL — High Performance Frequency Synthesizer System with Integrated VCO (592 - 634 MHz, 1184 - 1268 MHz)

The LMX2531 is a low power, high performance frequency synthesizer system which includes a fully integrated delta-sigma PLL and VCO with fully integrated tank circuit. The third and fourth poles are also integrated and also adjustable. Also included are integrated ultra-low noise and high precision (...)

In stock

Limit: 2

Evaluation board

LMX25312080EVAL — High Performance Frequency Synthesizer System with Integrated VCO (952 - 1137 MHz, 1904 - 2274 MHz)

The LMX2531 is a low power, high performance frequency synthesizer system which includes a fully integrated delta-sigma PLL and VCO with fully integrated tank circuit. The third and fourth poles are also integrated and also adjustable. Also included are integrated ultra-low noise and high (...)

In stock

Limit: 2

Evaluation board

LMX25312265EVAL — High Performance Frequency Synthesizer System with Integrated VCO (1089 - 1200 MHz, 2178 - 2400 MHz)

The LMX2531 is a low power, high performance frequency synthesizer system which includes a fully integrated delta-sigma PLL and VCO with fully integrated tank circuit. The third and fourth poles are also integrated and also adjustable. Also included are integrated ultra-low noise and high precision (...)

In stock

Limit: 2

Evaluation board

LMX25312820EVAL — High Performance Frequency Synthesizer System with Integrated VCO (1355 - 1462 MHz, 2710 - 2925 MHz)

The LMX2531 is a low power, high performance frequency synthesizer system which includes a fully integrated delta-sigma PLL and VCO with fully integrated tank circuit. The third and fourth poles are also integrated and also adjustable. Also included are integrated ultra-low noise and high precision (...)

In stock

Limit: 2

Evaluation board

LMX25313010EVAL — High Performance Frequency Synthesizer System with Integrated VCO (1455 - 1566 MHz, 2910 - 3132 MHz)

The LMX2531 is a low power, high performance frequency synthesizer system which includes a fully integrated delta-sigma PLL and VCO with fully integrated tank circuit. The third and fourth poles are also integrated and also adjustable. Also included are integrated ultra-low noise and high precision (...)

In stock

Limit: 2

Application software & framework

CLOCKDESIGNTOOL — Clock Design Tool - Loop Filter & Device Configuration + Simulation

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

PLLATINUMSIM-SW — Texas Instruments PLLatinum Simulator Tool

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.

Application software & framework

TICSPRO-SW — Texas Instruments Clocks and Synthesizers (TICS) Pro Software

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.

IDE, configuration, compiler or debugger

CODELOADER — CodeLoader Software for device register programming

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

(...)

Design tool

CLOCK-TREE-ARCHITECT — Clock tree architect programming software

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.

Design now

Reference designs

TIDA-00479 — Optimal Clock Sources for GSPS ADCs Reference Design

The ADC12D1600RFRB reference design provides a platform to demonstrate a high speed digitizer application which incorporates clocking, power management, and signal processing. The reference design utilizes the 1.6 GSPS ADC12D1600RF device, onboard FPGA Xilinx Virtex 4, and high performance clock (...)