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LM4832 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4832 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 22 page  LM4832 Digitally Controlled Tone and Volume Circuit with Stereo Audio Power Amplifier, Microphone Preamp Stage and National 3D Sound General Description The LM4832 is a monolithic integrated circuit that provides volume and tone (bass and treble) controls as well as a ste- reo audio power amplifier capable of producing 250 mW (typ) into 8 Ω or 90 mW (typ) into 32Ω with less than 1.0% THD. In addition, a two input microphone preamp stage, with volume control, capable of drivinga1k Ω load is imple- mented on chip. The LM4832 also features National’s 3D Sound circuitry which can be externally adjusted via a simple RC network. For maximum system flexibility, the LM4832 has an exter- nally controlled, low-power consumption shutdown mode, and an independent mute for power and microphone ampli- fiers . Boomer® audio integrated circuits were designed specifically to provide high quality audio while requiring few external components. Since the LM4832 incorporates tone and vol- ume controls, a stereo audio power amplifier and a micro- phone preamp stage, it is optimally suited to multimedia monitors and desktop computer applications. Key Specifications n Output Power at 10% into: 8 Ω 32 Ω 350 mW(typ) 100 mW(typ) n THD+Nat75mW into 32 Ω at 1 kHz 0.5%(max) n Microphone Input Referred Noise 7 µV(typ) n Supply Current 13 mA(typ) n Shutdown Current 4 µA(max) Features n Independent Left and Right Output Volume Controls n Treble and Bass Control n National 3D Sound n I 2C Compatible Interface n Two Microphone Inputs with Selector n Software Controlled Shutdown Function Applications n Multimedia Monitors n Portable and Desktop Computers Block Diagram Connection Diagram Boomer® is a registered trademark of National Semiconductor Corporation. DS100014-1 FIGURE 1. LM4832 Block Diagram DS100014-2 Top View Order Number LM4832N, LM4832M See NS Package Number N28B for DIP See NS Package Number M28B for SOIC February 1998 © 1998 National Semiconductor Corporation DS100014 www.national.com |
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