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データシートサーチシステム |
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データシートサーチシステム |
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LM4938 データシート(PDF) 1 Page - National Semiconductor (TI) |
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LM4938 データシート(HTML) 1 Page - National Semiconductor (TI) |
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1 / 26 page  LM4938 Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain General Description The LM4938 is a monolithic integrated circuit that provides DC volume control, and stereo bridged audio power amplifi- ers capable of producing 2W into 4 Ω (Note 1) with less than 1.0% THD or 2.2W into 3 Ω (Note 2) with less than 1.0% THD. Boomer® audio integrated circuits were designed specifically to provide high quality audio while requiring a minimum amount of external components. The LM4938 incorporates a DC volume control, stereo bridged audio power amplifiers and a selectable gain or bass boost, making it optimally suited for multimedia monitors, portable radios, desktop, and portable computer applications. The LM4938 features an externally controlled, low-power consumption shutdown mode, and both a power amplifier and headphone mute for maximum system flexibility and performance. Note 1: When properly mounted to the circuit board, LM4938MH will deliver 2W into 4 Ω. See Application Information section Exposed-DAP package PCB Mounting Considerations for more information. Note 2: An LM4938MH that has been properly mounted to the circuit board and forced-air cooled will deliver 2.2W into 3 Ω. Key Specifications n P O at 1% THD+N n into 3 Ω 2.2W (typ) n into 4 Ω 2.0W (typ) n into 8 Ω 1.3W (typ) n Single-ended mode - THD+N at 92mW into 32 Ω 1.0%(typ) n Shutdown current 0.5µA (typ) Features n Improved click and pop circuitry virtually eliminates noise during turn on/off transitions n DC Volume Control Interface n System Beep Detect n Stereo switchable bridged/single-ended power amplifiers n Selectable internal/external gain and bass boost n Thermal shutdown protection circuitry n Unity gain stable Applications n Flat Panel Displays n Portable and Desktop Computers n Multimedia Monitors n Portable Radios, PDAs, and Portable TVs Block Diagram Boomer® is a registered trademark of NationalSemiconductor Corporation. 20095601 FIGURE 1. LM4938 Block Diagram February 2005 © 2005 National Semiconductor Corporation DS200956 www.national.com |
同様の部品番号 - LM4938 |
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同様の説明 - LM4938 |
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