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LM4832 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM4832
Description  Digitally Controlled Tone and Volume Circuit with Stereo Audio Power Amplifier, Microphone Preamp Stage and National 3D Sound
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4832 Datasheet(HTML) 1 Page - National Semiconductor (TI)

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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
32
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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