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National Semiconductor Electronic Components Datasheet

LM4832 Datasheet

Digitally Tone/Volume

No Preview Available !

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 8or 90 mW (typ) into 32with less than 1.0%
THD. In addition, a two input microphone preamp stage, with
volume control, capable of driving a 1 kload 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
n THD + N at 75 mW into
32at 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


National Semiconductor Electronic Components Datasheet

LM4832 Datasheet

Digitally Tone/Volume

No Preview Available !

Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
Storage Temperature
Input Voltage
Power Dissipation (Note 3)
ESD Susceptibility (Note 4)
ESD Susceptibility (Note 5)
Junction Temperature
Soldering Information
Small Outline Package
Vapor Phase (60 sec.)
6.0V
−65˚C to +150˚C
−0.3V to VDD +0.3V
Internally limited
2000V
250V
150˚C
215˚C
Infrared (15 sec.)
220˚C
See AN-450 Surface Mounting and their Effects on
Product Reliabilityfor other methods of soldering
surface mount devices.
θJC (typ)—N28B
θJA (typ)—N28B
θJC (typ)—M28B
θJA (typ)—M28B
21˚C/W
62˚C/W
15˚C/W
69˚C/W
Operating Ratings
Temperature Range
TMIN TA TMAX
Supply Voltage
−40˚C TA 85˚C
4.5 VDD 5.5V
Electrical Characteristics for Entire IC(Notes 1, 2)
The following specifications apply for VDD = 5V unless otherwise noted. Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
LM4832
Typical Limit
(Note 6) (Note 7)
VDD Supply Voltage
VIN = 0V, IO = 0A
4.5
5.5
IDD Quiescent Power Supply Current
ISD Shutdown Current
INPUT ATTENUATORS
13 21
2.5 9
AR Attenuator Range
Attenuation at 0 dB Setting
Attenuation at −14 dB Setting
1
−15
AS Step Size
Gain Step Size Error
0 dB to −14 dB
2
0.1
ET Channel to Channel Tracking Error
BASS CONTROL
0.15
AR Bass Control Range
f = 100 Hz, VIN = 0.25V
±12 −14
14
AS Bass Step Size
ESE Bass Step Size Error
ET Bass Tracking Error
TREBLE CONTROL
2
0.5
0.15
AR Treble Control Range
fIN = 10 kHz, VIN = 0.25V
±12 −13
13
AS Treble Step Size
ESE Treble Step Size Error
ET Treble Tracking Error
OUTPUT ATTENUATORS
2
0.1
0.15
AR Attenuator Range
AS Step Size
Step Size Error
Gain at +20 dB Setting
Attenuation at −40 dB Setting
+20 dB to −40 dB
21
−42
2
0.1
ET Channel to Channel Tracking Error
AUDIO PATH
0.1
VOS Output Offset Voltage
VIN = 0V
3 50
Units
(Limits)
V (min)
V (max)
mA (max)
µA (max)
dB (max)
dB (min)
dB
dB (max)
dB (max)
dB (min)
dB (max)
dB
dB (max)
dB (max)
dB (min)
dB (max)
dB
dB (max)
dB (max)
dB (max)
dB (min)
dB
dB (max)
dB (max)
mV (max)
www.national.com
2


Part Number LM4832
Description Digitally Tone/Volume
Maker National Semiconductor
PDF Download

LM4832 Datasheet PDF






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