產品詳細資料

Rating Catalog Operating temperature range (°C) -40 to 85
Rating Catalog Operating temperature range (°C) -40 to 85
WQFN (RSG) 28 25 mm² 5 x 5
  • Stereo filterless Class D amplifier
  • Selectable OCL/CC headphone amplifier
  • Headphone sense ability
  • National’s 3D Enhancement
  • RF suppression
  • I 2 C control interface
  • 32-step digital volume control
  • 6 Operating Modes
  • Output short circuit protection and thermal shutdown protection
  • Minimum external components
  • Click and Pop suppression
  • Micro-power shutdown
  • Independent speaker and headphone volume controls
  • Available in space-saving 28 pin LLP package

  • Stereo filterless Class D amplifier
  • Selectable OCL/CC headphone amplifier
  • Headphone sense ability
  • National’s 3D Enhancement
  • RF suppression
  • I 2 C control interface
  • 32-step digital volume control
  • 6 Operating Modes
  • Output short circuit protection and thermal shutdown protection
  • Minimum external components
  • Click and Pop suppression
  • Micro-power shutdown
  • Independent speaker and headphone volume controls
  • Available in space-saving 28 pin LLP package

  • The LM49270 is a fully integrated audio subsystem designed for stereo multimedia applications. The LM49270 combines a 2.2W stereo Class D amplifier with a 155mW stereo headphone amplifier, volume control, headphone sense, and National’s unique 3D sound enhancement into a single device. The LM49270 uses flexible I 2C control interface for multiple application requirements.

    The filterless stereo class D amplifiers delivers 2.2W/channel into a 4Ω load with less than 10% THD+N with a 5V supply. The headphone amplifier features National’s Output Capacitor-less (OCL) architecture that eliminates the output coupling capacitors required by traditional headphone amplifiers.

    The IC features a headphone sense input (HPS) that automatically detects the presence of a headphone and configures the device accordingly. The LM49270 can automatically switch from OCL headphone output to a line driver output. If the VOC pin is pulled to GND, the VOC amplifier is disabled and the VOC pin is internally set to GND. This feature allows the LM49270 to be used as a line driver in OCL mode without a GND conflict on the headphone jack sleeve. Additionally, the headphone amplifier can be configured as capacitively coupled (CC).

    The LM49270 features a 32 step volume control for the headphone and stereo outputs. The device mode select and volume are controlled through an I 2C compatible interface.

    Output short circuit and thermal shutdown protection prevent the device from being damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM49270 is available in a space saving 28-pin, 5x5mm LLP package.


    Key Specifications

    Stereo Class D Amplifier Efficiency:  
    VDD = 3.3V, 450mW/Ch into 8Ω 84%
    VDD = 5V, 1W/Ch into 8Ω 84%
    Quiescent Power Supply Current, VDD = 3.3V
    Speaker Mode 5.5mA
    Headphone Mode (OCL) 4mA
    Power Output/Channel, VDD = 5V  
    Class D Speaker amplifier:  
     RL = 4Ω, THD+N = 10% 2.2W
     RL = 8Ω, THD+N = 1% 1.06W
    Headphone amplifier:  
     RL = 16Ω, THD+N = 1% 155mW
     RL = 32Ω, THD+N = 1% 90mW
    Shutdown current 0.02μA

    The LM49270 is a fully integrated audio subsystem designed for stereo multimedia applications. The LM49270 combines a 2.2W stereo Class D amplifier with a 155mW stereo headphone amplifier, volume control, headphone sense, and National’s unique 3D sound enhancement into a single device. The LM49270 uses flexible I 2C control interface for multiple application requirements.

    The filterless stereo class D amplifiers delivers 2.2W/channel into a 4Ω load with less than 10% THD+N with a 5V supply. The headphone amplifier features National’s Output Capacitor-less (OCL) architecture that eliminates the output coupling capacitors required by traditional headphone amplifiers.

    The IC features a headphone sense input (HPS) that automatically detects the presence of a headphone and configures the device accordingly. The LM49270 can automatically switch from OCL headphone output to a line driver output. If the VOC pin is pulled to GND, the VOC amplifier is disabled and the VOC pin is internally set to GND. This feature allows the LM49270 to be used as a line driver in OCL mode without a GND conflict on the headphone jack sleeve. Additionally, the headphone amplifier can be configured as capacitively coupled (CC).

    The LM49270 features a 32 step volume control for the headphone and stereo outputs. The device mode select and volume are controlled through an I 2C compatible interface.

    Output short circuit and thermal shutdown protection prevent the device from being damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM49270 is available in a space saving 28-pin, 5x5mm LLP package.


    Key Specifications

    Stereo Class D Amplifier Efficiency:  
    VDD = 3.3V, 450mW/Ch into 8Ω 84%
    VDD = 5V, 1W/Ch into 8Ω 84%
    Quiescent Power Supply Current, VDD = 3.3V
    Speaker Mode 5.5mA
    Headphone Mode (OCL) 4mA
    Power Output/Channel, VDD = 5V  
    Class D Speaker amplifier:  
     RL = 4Ω, THD+N = 10% 2.2W
     RL = 8Ω, THD+N = 1% 1.06W
    Headphone amplifier:  
     RL = 16Ω, THD+N = 1% 155mW
     RL = 32Ω, THD+N = 1% 90mW
    Shutdown current 0.02μA

    下載 觀看有字幕稿的影片 影片

    技術文件

    star =TI 所選的此產品重要文件
    找不到結果。請清除您的搜尋條件,然後再試一次。
    檢視所有 2
    類型 標題 日期
    * Data sheet Filterless 2.2W Stereo Class D w/OCL Headphone Amp, 3D Enhance & Headphone Sense datasheet (Rev. B) 2007年 3月 17日
    User guide AN-1638 LM49270 Demonstration Board (Rev. A) 2013年 5月 1日

    設計與開發

    如需其他條款或必要資源,請按一下下方的任何標題以檢視詳細頁面 (如有)。

    開發模組 (EVM) 的 GUI

    SNAC030 Audio subsystem with stereo, filterless 2.2W class D speaker drivers SW

    支援產品和硬體

    支援產品和硬體

    產品
    喇叭放大器
    LM49270 具 155-mW 耳機放大器和 3D 強化功能的 2.3 W 立體聲 D 類音訊放大器
    模擬工具

    PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具

    PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
    封裝 針腳 CAD 符號、佔位空間與 3D 模型
    WQFN (RSG) 28 Ultra Librarian

    訂購與品質

    內含資訊:
    • RoHS
    • REACH
    • 產品標記
    • 鉛塗層/球物料
    • MSL 等級/回焊峰值
    • MTBF/FIT 估算值
    • 材料內容
    • 認證摘要
    • 進行中持續性的可靠性監測
    內含資訊:
    • 晶圓廠位置
    • 組裝地點

    支援與培訓

    內含 TI 工程師技術支援的 TI E2E™ 論壇

    內容係由 TI 和社群貢獻者依「現狀」提供,且不構成 TI 規範。檢視使用條款

    若有關於品質、封裝或訂購 TI 產品的問題,請參閱 TI 支援。​​​​​​​​​​​​​​

    影片