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LMX2531
  • LMX2531
  • LMX2531
  • LMX2531
  • LMX2531
  • LMX2531
  • LMX2531

LMX2531

ACTIVE

High performance frequency synthesizer system with integrated VCO

Texas Instruments LMX2531 Product Info

1 April 2026 3

Parameters

Frequency (max) (MHz)

3132

Frequency (min) (MHz)

553

Normalized PLL phase noise (dBc/Hz)

-212

1/f noise (10-kHz offset at 1-GHz carrier) (dBc/Hz)

-104

Features

Integrated VCO

Current consumption (mA)

34

Integrated VCO

Yes

Operating temperature range (°C)

-40 to 85

Rating

Catalog

Lock time (µs) (typ) (s)

300

Package

WQFN (NJG)-36-36 mm² 6 x 6

Features

  • 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

Description

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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