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RF PLL 與合成器

LMX2571

現行

具頻移鍵控 (FSK) 調變的 1.34-GHz、低功耗、極端溫度射頻合成器

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產品規格表

LMX2571

現行
產品規格表 立即訂購

產品詳細資料

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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技術文件

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重要文件 類型 標題 格式選項 日期
* Data sheet LMX2571 Low-Power, High-Performance PLLatinum RF Synthesizer with FSK Modulation datasheet (Rev. A) PDF | HTML 2016年 6月 1日
Application note Practical Clocking Considerations That Give Your Next High-Speed Converter Design an Edge (Rev. A) PDF | HTML 2025年 4月 11日
Application brief Compilation of RF Synthesizer Resources PDF | HTML 2024年 10月 22日
Technical article How to implement FM modulation PDF | HTML 2017年 8月 3日
Application note Frequency Shift Keying with LMX2571 2017年 5月 30日
Application note LMX2571 Using a Programmable Input Multiplier to Minimize Integer Boundary Spurs 2016年 1月 12日
Technical article Timing is Everything: Improving integer boundary spurs in fractional PLL synthesiz PDF | HTML 2015年 8月 5日

設計與開發

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開發板

LMX2571EVM — 適用於 1.34-GHz、低功耗、極端溫度射頻合成器的 LMX2571 評估模組

LMX2571EVM 是一款適用於 LMX2571 的評估板，其為具低雜訊、高效能整合式 VCO 的頻率合成器。VCO 核心是低雜訊 5GHz VCO，在輸出通道分頻器之後，分配的頻率是 10MHz 至 1400MHz。

內部 VCO 是可由支線疏運的，允許使用外部 VCO。分離式 5V 充電幫浦專供外部 VCO 使用，不再需要支援 5V VCO 的運算放大器。外部 VCO 的輸出也可透過另一個輸出通道分頻器進行路由。

LMX2571EVM 可透過 (1) SPI 程式設計、(2) I2S 程式設計和 (3) PIN 模式進行編程。PIN 模式支援最高 8 階 FSK 調變。電路板可透過由 5V (...)

使用指南: PDF
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支援軟體

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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設計工具

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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設計工具

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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參考設計

TIDA-00886 — 採用單節電池供電的低功耗射頻 PLL 合成器參考設計

TIDA-00886 包含 LMX2571、高性能、寬頻 PLLatinum™ 低功率 RF 合成器，並由使用 TPS63050 DC-DC 降壓升壓轉換器的單芯電池供電。  TIDA-00886 展現 DC-DC 降壓升壓轉換器對 LMX2571 的相位雜訊性能影響極小，甚至可忽略不計。  LMX2571 在 2 路無線電應用以及手持式測試和測量設備中非常受歡迎。雖然這是低電流消耗裝置（合成器模式下的 39mA（內部 VCO）和 PLL 模式下的 9mA（外部 VCO）），但效率對電池供電應用而言至關重要。
Design guide: PDF
電路圖: PDF
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WQFN (NJK) 36 Ultra Librarian
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