Detalles del producto

Frequency (max) (MHz) 1344 Frequency (min) (MHz) 10 Normalized PLL phase noise (dBc/Hz) -231 1/f noise (10-kHz offset at 1-GHz carrier) (dBc/Hz) -124 Features FSK modulation, Integer-boundary spurs (IBS) removal, Integrated VCO, Wideband Current consumption (mA) 39 Integrated VCO Yes Operating temperature range (°C) -40 to 85 Rating Catalog Lock time (µs) (typ) (s) 0.00014
Frequency (max) (MHz) 1344 Frequency (min) (MHz) 10 Normalized PLL phase noise (dBc/Hz) -231 1/f noise (10-kHz offset at 1-GHz carrier) (dBc/Hz) -124 Features FSK modulation, Integer-boundary spurs (IBS) removal, Integrated VCO, Wideband Current consumption (mA) 39 Integrated VCO Yes Operating temperature range (°C) -40 to 85 Rating Catalog Lock time (µs) (typ) (s) 0.00014
WQFN (NJK) 36 36 mm² 6 x 6
  • Any Frequency from 10 MHz to 1344 MHz
  • Low Phase Noise and Spurs
    • –123 dBc/Hz at 12.5 kHz Offset at 480 MHz
    • –145 dBc/Hz at 1 MHz Offset at 480 MHz
    • Normalized PLL Noise Floor of –231 dBc/Hz
    • Spurious Better Than –75 dBc/Hz
  • New FastLock to Reduce Lock Time
  • A Novel Technique to Remove Integer Boundary
    Spurs
  • Integrated 5-V Charge Pump and Output Divider
    for External VCO Operation
  • 2-, 4- and 8-Level or Arbitrary Level Direct Digital
    FSK Modulation
  • One TX/RX Output or Two Fanout Outputs
  • Crystal, XO or Differential Reference Clock Input
  • Low Current Consumption
    • 39-mA Typical Synthesizer Mode (Internal
      VCO)
    • 9-mA Typical PLL Mode (External VCO)
  • 24-Bit Fractional-N Delta Sigma Modulator
  • Any Frequency from 10 MHz to 1344 MHz
  • Low Phase Noise and Spurs
    • –123 dBc/Hz at 12.5 kHz Offset at 480 MHz
    • –145 dBc/Hz at 1 MHz Offset at 480 MHz
    • Normalized PLL Noise Floor of –231 dBc/Hz
    • Spurious Better Than –75 dBc/Hz
  • New FastLock to Reduce Lock Time
  • A Novel Technique to Remove Integer Boundary
    Spurs
  • Integrated 5-V Charge Pump and Output Divider
    for External VCO Operation
  • 2-, 4- and 8-Level or Arbitrary Level Direct Digital
    FSK Modulation
  • One TX/RX Output or Two Fanout Outputs
  • Crystal, XO or Differential Reference Clock Input
  • Low Current Consumption
    • 39-mA Typical Synthesizer Mode (Internal
      VCO)
    • 9-mA Typical PLL Mode (External VCO)
  • 24-Bit Fractional-N Delta Sigma Modulator

The LMX2571 is a low-power, high-performance, wideband PLLatinum RF synthesizer that integrates a delta-sigma fractional N PLL, multiple core voltage-controlled oscillator (VCO), programmable output dividers and two output buffers. The VCO cores work up to 5.376 GHz resulting in continuous output frequency range of 10 MHz to 1344 MHz.

This synthesizer can also be used with an external VCO. To that end, a dedicated 5-V charge pump and an output divider are available for this configuration.

A unique programmable multiplier is also incorporated to help improve spurs, allowing the system to use every channel even if it falls on an integer boundary.

The output has an integrated SPDT switch that can be used as a transmit/receive switch in FDD radio application. Both outputs can also be turned on to provide 2 outputs at the same time.

The LMX2571 supports direct digital FSK modulation through programming or pins. Discrete level FSK, pulse shaping FSK, and analog FM modulation are supported.

A new FastLock technique can be used allowing the user to step from one frequency to the next in less than 1.5 ms even when an external VCO is used with a narrow band loop filter.

The LMX2571 is a low-power, high-performance, wideband PLLatinum RF synthesizer that integrates a delta-sigma fractional N PLL, multiple core voltage-controlled oscillator (VCO), programmable output dividers and two output buffers. The VCO cores work up to 5.376 GHz resulting in continuous output frequency range of 10 MHz to 1344 MHz.

This synthesizer can also be used with an external VCO. To that end, a dedicated 5-V charge pump and an output divider are available for this configuration.

A unique programmable multiplier is also incorporated to help improve spurs, allowing the system to use every channel even if it falls on an integer boundary.

The output has an integrated SPDT switch that can be used as a transmit/receive switch in FDD radio application. Both outputs can also be turned on to provide 2 outputs at the same time.

The LMX2571 supports direct digital FSK modulation through programming or pins. Discrete level FSK, pulse shaping FSK, and analog FM modulation are supported.

A new FastLock technique can be used allowing the user to step from one frequency to the next in less than 1.5 ms even when an external VCO is used with a narrow band loop filter.

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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Fecha
* Data sheet LMX2571 Low-Power, High-Performance PLLatinum RF Synthesizer with FSK Modulation datasheet (Rev. A) PDF | HTML 01 jun 2016
Application note Practical Clocking Considerations That Give Your Next High-Speed Converter Design an Edge (Rev. A) PDF | HTML 11 abr 2025
Application brief Compilation of RF Synthesizer Resources PDF | HTML 22 oct 2024
Technical article How to implement FM modulation PDF | HTML 03 ago 2017
Application note Frequency Shift Keying with LMX2571 30 may 2017
Application note LMX2571 Using a Programmable Input Multiplier to Minimize Integer Boundary Spurs 12 ene 2016
Technical article Timing is Everything: Improving integer boundary spurs in fractional PLL synthesiz PDF | HTML 05 ago 2015

Diseño y desarrollo

Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.

Placa de evaluación

LMX2571EVM — Módulo de evaluación LMX2571 para sintetizador RF de 1.34 GHz, baja potencia y temperatura extrema

The LMX2571EVM is an evaluation board for the LMX2571 which is a frequency synthesizer with low noise, high performance integrated VCO. The VCO core is a low noise 5GHz VCO, after the output channel divider, the divided down frequencies are 10MHz to 1400MHz.

The internal VCO is bypassable, allowing (...)

Guía del usuario: PDF
Soporte de software

TICSPRO-SW TICS Pro GUI and Live Programming Tool for Clocking Devices

Texas Instruments clocks and synthesizers (TICS) pro software is used to program the evaluation modules (EVMs) for product numbers with these prefixes: CDC, LMK and LMX. These products include phase-locked loops and voltage-controlled oscillators (PLL+VCO), synthesizers and clocking devices.

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Herramienta de diseño

CLOCK-TREE-ARCHITECT — Software de programación de diseño de árbol de reloj

La herramienta de síntesis de tipo árbol de reloj “arquitecto de tipo árbol de reloj” agiliza el proceso de diseño al generar soluciones de árbol de reloj en función de los requisitos del sistema. La herramienta extrae datos de una amplia base de datos de productos de relojes para generar una (...)
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PLLATINUMSIM-SW PLL loop filter, phase noise, lock time, and spur simulation tool

PLLATINUMSIM-SW is a simulation tool that allows users to create detailed designs and simulations of our PLLatinum™ integrated circuits, which include the LMX series of phase-locked loops (PLLs) and synthesizers.

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Diseños de referencia

TIDA-00886 — Diseño de referencia del sintetizador RF PLL de baja potencia que funciona desde una batería de una

El TIDA-00886 está compuesto por el LMX2571, un sintetizador RF de baja potencia, alto rendimiento y banda ancha de la familia PLLatinum™, alimentado por una batería de una celda única mediante el convertidor CC/CC buck-boost TPS63050.  El TIDA-00886 muestra que el convertidor buck-boost CC/CC (...)
Design guide: PDF
Esquema: PDF
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WQFN (NJK) 36 Ultra Librarian

Pedidos y calidad

Información incluida:
  • RoHS
  • REACH
  • Marcado del dispositivo
  • Acabado de plomo/material de la bola
  • Clasificación de nivel de sensibilidad a la humedad (MSL)/reflujo máximo
  • Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
  • Contenido del material
  • Resumen de calificaciones
  • Monitoreo continuo de confiabilidad
Información incluida:
  • Lugar de fabricación
  • Lugar de ensamblaje

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Soporte y capacitación

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