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National Semiconductor Electronic Components Datasheet

LM4831 Datasheet

Multimedia Computer Audio-Chip

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November 1998
LM4831
Multimedia Computer Audio Chip
General Description
The LM4831 is a monolithic integrated circuit that provides a
stereo three input mixer, two stereo input analog multiplexer,
a stereo line out and a dual 1W bridged audio power ampli-
fier. In addition, a low noise microphone preamp is included
on-chip.
The LM4831 is ideal for multimedia computers since it incor-
porates an input mixer, analog multiplexer, and configurable
stereo audio power amplifier, as well as a microphone
preamp stage. This combination allows for all of the analog
audio processing to be enclosed in a 44-pin TQFP package.
The LM4831 features an externally controlled, low-power
consumption shutdown mode, as well as both headphone
and docking station modes. To temporarily override the shut-
down mode and allow audio signals to be amplified, the
LM4831 provides four “beep” pins.
Key Specifications
n THD+N at 1W into 8
n Microphone Input Referred Noise
n Supply Current - Bridged Mode
n Shutdown Current
0.6% (typ)
10µV (typ)
16mA (typ)
2µA (typ)
Features
n Stereo 1W audio power amplifier
n “Click and pop” suppression circuitry
n Stereo three input mixer
n Shutdown mode
n Multiple operating modes — bridged, single-ended and
docking station modes
n Internal mux for switching in/out external filter
n Beep circuitry for “wake-up” while in shutdown
n 44 Pin TQFP Packaging
Applications
n Portable and Desktop Computers
Block Diagram
Connection Diagram
DS100057-1
FIGURE 1. LM4831 Block Diagram
Boomer® is a registered trademark of National Semiconductor Corporation.
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100057
Top View
Order Number LM4831VF
See NS Package Number VEJ44A
DS100057-3
www.national.com


National Semiconductor Electronic Components Datasheet

LM4831 Datasheet

Multimedia Computer Audio-Chip

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
6.0V
−65˚C to 150˚C
−0.3V to VDD +0.3V
Internally limited
2500V
200V
150˚C
Vapor Phase (60 sec.)
215˚C
Infrared (15 sec.)
220˚C
See AN-450 “Surface Mounting and their Effects on
Product Reliability” for other methods of soldering
surface mount devices.
Thermal Resistance
θJC (typ)
θJA (typ)
15˚C/W
62˚C/W
Operating Ratings
Temperature Range
Supply Voltage
−40˚C to 85˚C
2.7 VDD 5.5V
Electrical Characteristics
(Notes 1, 2) The following specifications apply for VDD = 5V, RL = 8and f = 1 kHz, unless otherwise specified. Distortion
measurements represent the full audio chain from Input A of each channel to their respective output. Limits apply for
TA = 25˚C.
Symbol
Parameter
Conditions
LM4831
Typical
(Note
6)
Limit
(Note
7)
Units
(Limits)
General Characteristics For Entire IC
VDD Supply Voltage
2.7 V (min)
5.5 V (max)
I DD Quiescent Power Supply Bridged Mode, IO = 0 mA
Current
Single-Ended Mode, IO = 0 mA
16 50 mA (max)
10.5
mA
Docking Station Mode, IO = 0 mA
7
mA
ISD Shutdown Current
VPIN-43 = 5V, V PIN-41 = VPIN-42 = 0V
2
50 µA (max)
VDD/2
Half Supply Bypass Voltage
VIN = 0V, VPin-43 = 0V
2.45
2.4
V (min)
2.6 V (max)
Power Amplifiers
PO
THD
Output Power - Bridged
Mode
Output Power -
Single-Ended Mode
Total Harmonic Distortion
VOS
ENoise
Output Offset Voltage
Input Referred Noise
RL = 8,THD = 1%
1.1 1 W (min)
RL = 4, THD = 1%
1.5
W
RL = 8, THD = 1% 300 mW
RL = 4, THD = 1% 550 mW
Bridged Mode, PO = 1W, RL = 8
0.5 2.0 % (Max)
Single-Ended Mode, PO = 225mW,
RL = 8
0.15
%
VIN = 0V
5 50 mV (Max)
A-Weighted Filter, VIN = 0V,
RL = 8
Bridged Output
45 100 µV (max)
Single-Ended Output
35 100 µV (max)
PSRR
Power Supply Rejection
Ratio
f = 1kHz, CB = 0.5µF, RL = 8
Bridged Output
47
dB
Single-Ended Output
45
dB
XTALK
Channel to Channel
Crosstalk
f = 1kHz, PO = 1W, RL = 8
Right to Left
−82
dB
Left to Right
−73 dB
ITS
TRI-STATE® Current-Single
VPIN-41 = 4.0V, L_PA+OUT =
Ended Mode
R_PA+OUT = VDD or GND
80 100 µA (max)
www.national.com
2


Part Number LM4831
Description Multimedia Computer Audio-Chip
Maker National Semiconductor
PDF Download

LM4831 Datasheet PDF





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