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RF PLL 與合成器

LMX2485E

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適用 RF 個人通訊的 50MHz 至 3GHz ΔΣ 低功耗雙 PLL

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產品規格表

LMX2485E

現行
產品規格表 立即訂購

產品詳細資料

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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重要文件 類型 標題 格式選項 日期
* Data sheet LMX2485x 3-GHz Delta-Sigma Low-Power Dual PLLatinum Frequency Synthesizer datasheet (Rev. G) PDF | HTML 2016年 1月 13日
Application note AN-1879 Fractional N Frequency Synthesis (Rev. B) 2021年 11月 18日

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軟體程式設計工具

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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CLOCKDESIGNTOOL — Clock Design Tool Software

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 (...)

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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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CLOCK-TREE-ARCHITECT — 時鐘樹架構程式設計軟體

時鐘樹架構是一款時鐘樹合成工具，可根據您的系統需求產生時鐘樹解決方案，進而簡化您的設計流程。此工具可從廣泛的計時產品資料庫中汲取資料，產生系統級多晶片計時解決方案。
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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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WQFN (RTW) 24 Ultra Librarian
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