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PLL y sintetizadores de RF

LMX2485E

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PLL doble de baja potencia delta sigma de 50 MHz a 3 GHz para comunicaciones personales de RF

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LMX2485E

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Detalles del producto

Frequency (max) (MHz) 3000 Frequency (min) (MHz) 50 Normalized PLL phase noise (dBc/Hz) -210 1/f noise (10-kHz offset at 1-GHz carrier) (dBc/Hz) -104 Features Advanced delta-sigma fractional compensation, Cycle slip reduction, Dual PLL, Fastlock, Integrated timeout counter, On-chip input frequency doubler Current consumption (mA) 3.3 Integrated VCO No Operating temperature range (°C) -40 to 85 Rating Catalog Lock time (µs) (typ) (s) Loop BW dependent
Frequency (max) (MHz) 3000 Frequency (min) (MHz) 50 Normalized PLL phase noise (dBc/Hz) -210 1/f noise (10-kHz offset at 1-GHz carrier) (dBc/Hz) -104 Features Advanced delta-sigma fractional compensation, Cycle slip reduction, Dual PLL, Fastlock, Integrated timeout counter, On-chip input frequency doubler Current consumption (mA) 3.3 Integrated VCO No Operating temperature range (°C) -40 to 85 Rating Catalog Lock time (µs) (typ) (s) Loop BW dependent
WQFN (RTW) 24 16 mm² 4 x 4
  • Quadruple Modulus Prescaler for Lower Divides
    • RF PLL: 8/9/12/13 or 16/17/20/21
    • IF PLL: 8/9 or 16/17
  • Advanced Delta-Sigma Fractional Compensation
    • 12-Bit or 22-Bit Selectable Fractional Modulus
    • Up to 4th Order Programmable Delta-Sigma
      Modulator
  • Features for Improved Lock Time
    • Fastlock / Cycle Slip Reduction With Integrated
      Time-Out Counter Which Requires Only a
      Single-Word Write
  • Wide Operating Range
    • LMX2485 RF PLL: 500 MHz to 3.0 GHz
    • LMX2485E RF PLL: 50 MHz to 3.0 GHz
  • Useful Features
    • Digital Lock Detect Output
    • Hardware and Software Power-Down Control
    • On-Chip Input Frequency Doubler.
    • RF Phase Detector Frequency up to 50 MHz
    • 2.5 to 3.6 V Operation With ICC = 5.0 mA
  • Quadruple Modulus Prescaler for Lower Divides
    • RF PLL: 8/9/12/13 or 16/17/20/21
    • IF PLL: 8/9 or 16/17
  • Advanced Delta-Sigma Fractional Compensation
    • 12-Bit or 22-Bit Selectable Fractional Modulus
    • Up to 4th Order Programmable Delta-Sigma
      Modulator
  • Features for Improved Lock Time
    • Fastlock / Cycle Slip Reduction With Integrated
      Time-Out Counter Which Requires Only a
      Single-Word Write
  • Wide Operating Range
    • LMX2485 RF PLL: 500 MHz to 3.0 GHz
    • LMX2485E RF PLL: 50 MHz to 3.0 GHz
  • Useful Features
    • Digital Lock Detect Output
    • Hardware and Software Power-Down Control
    • On-Chip Input Frequency Doubler.
    • RF Phase Detector Frequency up to 50 MHz
    • 2.5 to 3.6 V Operation With ICC = 5.0 mA

The LMX2485 device is a low power, high performance delta-sigma fractional-N PLL with an auxiliary integer-N PLL. The device is fabricated using Texas Instruments’ advanced process.

With delta-sigma architecture, fractional spurs at lower offset frequencies are pushed to higher frequencies outside the loop bandwidth. The ability to push close in spur and phase noise energy to higher frequencies is a direct function of the modulator order. Unlike analog compensation, the digital feedback technique used in the LMX2485 is highly resistant to changes in temperature and variations in wafer processing. The LMX2485 delta-sigma modulator is programmable up to fourth order, which allows the designer to select the optimum modulator order to fit the phase noise, spur, and lock time requirements of the system.

Serial data for programming the LMX2485 is transferred through a three-line, high-speed (20-MHz) MICROWIRE interface. The LMX2485 offers fine frequency resolution, low spurs, fast programming speed, and a single-word write to change the frequency. This makes it ideal for direct digital modulation applications, where the N-counter is directly modulated with information. The LMX2485 is available in a 24-lead 4.0 × 4.0 × 0.8 mm WQFN package.

The LMX2485 device is a low power, high performance delta-sigma fractional-N PLL with an auxiliary integer-N PLL. The device is fabricated using Texas Instruments’ advanced process.

With delta-sigma architecture, fractional spurs at lower offset frequencies are pushed to higher frequencies outside the loop bandwidth. The ability to push close in spur and phase noise energy to higher frequencies is a direct function of the modulator order. Unlike analog compensation, the digital feedback technique used in the LMX2485 is highly resistant to changes in temperature and variations in wafer processing. The LMX2485 delta-sigma modulator is programmable up to fourth order, which allows the designer to select the optimum modulator order to fit the phase noise, spur, and lock time requirements of the system.

Serial data for programming the LMX2485 is transferred through a three-line, high-speed (20-MHz) MICROWIRE interface. The LMX2485 offers fine frequency resolution, low spurs, fast programming speed, and a single-word write to change the frequency. This makes it ideal for direct digital modulation applications, where the N-counter is directly modulated with information. The LMX2485 is available in a 24-lead 4.0 × 4.0 × 0.8 mm WQFN package.
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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Fecha
* Data sheet LMX2485x 3-GHz Delta-Sigma Low-Power Dual PLLatinum Frequency Synthesizer datasheet (Rev. G) PDF | HTML 13 ene 2016
Application note AN-1879 Fractional N Frequency Synthesis (Rev. B) 18 nov 2021

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.

Herramienta de programación de software

CODELOADER — CodeLoader Device Register Programming v4.19.0

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.

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Soporte de software

CLOCKDESIGNTOOL — Clock Design Tool Software

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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

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Herramienta de diseño

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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Encapsulado Pines Símbolos CAD, huellas y modelos 3D
WQFN (RTW) 24 Ultra Librarian
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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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