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PDF LM4832N Data sheet ( Hoja de datos )
| Número de pieza | LM4832N | |
| Descripción | Digitally Controlled Tone and Volume Circuit with Stereo Audio Power Amplifier/ Microphone Preamp Stage and National 3D Sound | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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February 1998
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 8Ω 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 driving a 1 kΩ 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:
8Ω
32Ω
n THD + N at 75 mW into
32Ω at 1 kHz
n Microphone Input Referred
Noise
n Supply Current
n Shutdown Current
350 mW(typ)
100 mW(typ)
0.5%(max)
7 µV(typ)
13 mA(typ)
4 µA(max)
Features
n Independent Left and Right Output Volume Controls
n Treble and Bass Control
n National 3D Sound
n I2C 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
FIGURE 1. LM4832 Block Diagram
Boomer® is a registered trademark of National Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100014
DS100014-2
DS100014-1
Top View
Order Number LM4832N, LM4832M
See NS Package Number N28B for DIP
See NS Package Number M28B for SOIC
www.national.com
1 page  
Pin Description
LEFT 3D (1)
RIGHT 3D
(28)
BYPASS (2)
POWER
AMP OUT
LEFT (3)
RIGHT (26)
POWER
GND (4)
LOOP OUT
(8, 21)
LOOP IN (5,
24)
TONE OUT
(6, 23)
TONE IN
(7, 22)
INPUTS
(9, 20)
ANALOG
GND (10)
MIC
INPUTS
(11, 12)
MIC OUT
(14)
VDD
(13, 25)
ADDRESS
BITS (15,
16)
An external RC network is connected
across these pins. This function provides
left-right channel cross coupling and
cancellation to create an enhanced
stereo channel separation effect.
A 0.1 µF capacitor is placed between
this pin and ground to provide an AC
ground for the internal half-supply
voltage reference. The capacitor at this
pin affects “click-pop” and THD
performance. Turn-on and turn-off times
are also determined by this capacitor.
Refer to the Application Information
section for more information.
These outputs are intended to drive 8Ω
speakers or 32Ω headphones. These
outputs should be AC-coupled to the
loads. Refer to the Application
Information section for more information.
This pin provides the high current return
for the power output stage MOSFETs
and digital circuitry.
These pins allow an external signal
processor access to the stereo signal.
Please see the Application Information
section for more information.
These pins are connected to the tone
control op amp outputs and drive the
power amplifier inputs. Refer to the
Application Information section for more
information.
These pins are connected to the inputs
of the tone control op amps. A capacitor
between the Tone In and Tone Out pins
sets the frequency response of the tone
functions. Please refer to the Application
Information section for more information.
These pins are the stereo inputs for the
LM4832. These pins should be
AC-coupled to the input signals.
This pin is the AC analog ground for the
line level AC signal inputs.
These pins are the two independent
selectable microphone inputs. These
pins should be AC-coupled.
This pin is the output for the microphone
amplifier and should be AC-coupled to
the load.
These pins are for the 5V supply. These
pins should be separately bypassed by
0.1 µF, or higher, film capacitors. The 5V
supply should be bypassed by a 10 µF,
or higher, tantalum or aluminum
electrolytic capacitor.
These pins are used to determine the
I2C address for the LM4832.
CLOCK (17)
DATA (18)
GENERAL
PURPOSE
OUTPUT
(19)
RESET (27)
This pin is the input for the I2C clock
signal.
This pin is the input for the I2C data
signal.
This pin provides a general purpose
TTL/CMOS output. Please refer to the
Application Information section for more
information.
This pin is a TTL/CMOS input which is
used to reset the chip logic and states.
5 www.national.com
5 Page 
Truth Tables (Continued)
Treble Control
MSB
LSB
Level (dB)
0 1 0 X 0 0 0 0 −12
0 1 0 X 0 0 0 1 −10
0 1 0 X 0 0 1 0 −8
0 1 0 X 0 0 1 1 −6
0 1 0 X 0 1 0 0 −4
0 1 0 X 0 1 0 1 −2
0 1 0 X0 1 1 0 0
0 1 0 X0 1 1 1 2
0 1 0 X1 0 0 0 4
0 1 0 X1 0 0 1 6
0 1 0 X1 0 1 0 8
0 1 0 X 1 0 1 1 10
0 1 0 X 1 1 0 0 12
Treble Control
Power Up State
X 0 1 1 0 Treble Control is Flat
Left Volume Control
MSB
100
100
100
100
100
100
Left Volume Control
Power Up State
LSB
Function
0 0 0 0 0 20
0 0 0 0 1 18
... ... ... ... ... ...
1 1 1 0 1 −38
1 1 1 1 0 −40
1 1 1 1 1 Left Channel Mute
1 1 1 1 1 Left Channel is Muted
General Control
MSB
LSB
Function
111
0 Chip On
111
1 Chip Shutdown
111
0 G.P.O. Output Low
111
1 G.P.O. Output High
1 1 1 0 Stereo Enhance Off
1 1 1 1 Stereo Enhance On
111
0
Stereo Operation
111
1
Mono Force On
1110
External Loop Disable
1111
External Loop Enable
General Control
Power Up State
00000
11 www.national.com
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet LM4832N.PDF ] | |
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