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LM4838ITL Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4838ITL Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 36 page  LM4838 Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain General Description The LM4838 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 LM4838 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 LM4838 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, the LM4838LQ and LM4838MTE will deliver 2W into 4 Ω. The LM4838MT and LM4838ITL will deliver 1.1W into 8 Ω. See Application Information section Exposed-DAP package PCB Mounting Considerations for more information. Note 2: An LM4838LQ and LM4838MTE that have 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 (LQ & MTE) 2.2W (typ) n into 4 Ω (LQ & MTE) 2.0W (typ) n into 8 Ω (MT, MTE, ITL, & LQ) 1.1W (typ) n Single-ended mode - THD+N at 85mW into 32 Ω 1.0%(typ) n Shutdown current 0.7µA (typ) Features 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 “Click and pop” suppression circuitry n Thermal shutdown protection circuitry Applications 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. 20013301 FIGURE 1. LM4838 Block Diagram January 2003 © 2003 National Semiconductor Corporation DS200133 www.national.com |
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