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National Semiconductor Electronic Components Datasheet

LM4834 Datasheet

1.75W Audio Power Amplifier

No Preview Available !

November 1997
LM4834
1.75W Audio Power Amplifier with DC Volume Control
and Microphone Preamp
General Description
The LM4834 is a monolithic integrated circuit that provides
DC volume control, and a bridged audio power amplifier ca-
pable of producing 1.75W into 4with less than 1.0%
(THD). In addition, the headphone/lineout amplifier is ca-
pable of driving 70 mW into 32with less than 0.1%(THD).
The LM4834 incorporates a volume control and an input mi-
crophone preamp stage capable of driving a 1 kload im-
pedance.
Boomer® audio integrated circuits were designed specifically
to provide high quality audio while requiring a minimum
amount of external components in surface mount packaging.
The LM4834 incorporates a DC volume control, a bridged
audio power amplifier and a microphone preamp stage,
making it optimally suited for multimedia monitors and desk-
top computer applications.
The LM4834 features an externally controlled, low-power
consumption shutdown mode, and both a power amplifier
and headphone mute for maximum system flexibility and
performance.
Key Specifications
n THD at 1.1W continuous average
output power into 8at 1 kHz
n Output Power into 4at 1.0%
THD+N
n THD at 70mW continuous average
output power into 32at 1 kHz
n Shutdown Current
n Supply Current
0.5%(max)
1.75W(typ)
0.1%(typ)
1.0µA(max)
17.5mA(typ)
Features
n PC98 Compliant
n “Click and Pop” suppression circuitry
n Stereo line level outputs with mono input capability for
system beeps
n Microphone preamp with buffered power supply
n DC Volume Control Interface
n Thermal shutdown protection circuitry
Applications
n Multimedia Monitors
n Desktop and Portable Computers
Block Diagram
Connection Diagram
SSOP Package
DS100015-1
FIGURE 1. LM4834 Block Diagram
Boomer® is a registered trademark of NationalSemiconductor Corporation.
© 1997 National Semiconductor Corporation DS100015
DS100015-2
Top View
Order Number LM4834MS
See NS Package Number MSA028CB for SSOP
www.national.com


National Semiconductor Electronic Components Datasheet

LM4834 Datasheet

1.75W Audio Power Amplifier

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
ESD Susceptibility (Note 4)
Pin 5
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
1500V
200V
150˚C
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.
θJC (typ) — MSA028CB
θJA (typ) — MSA028CB
29˚C/W
95˚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
LM4834
Typical
(Note 6)
Limit
(Note 7)
VDD Supply Voltage
4.5
5.5
IDD
Quiescent Power Supply Current
VIN = 0V, IO= 0A
ISD Shutdown Current
V pin13 = VDD
17.5
0.6
26
2.0
Units
(Limits)
V (min)
V (max)
mA (max)
µA (max)
Electrical Characteristics for Volume Attenuators
(Notes 1, 2)
The following specifications apply for VDD = 5V. Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
CRANGE Attenuator Range
AM Mute Attenuation
Gain with Vpin 22 = 5V
Attenuation with Vpin 22 = 0V
Vpin 15 = 5V, Sum Out
Vpin 15 = 5V, Line Out/Headphone
Amp
LM4834
Typical
(Note 6)
Limit
(Note 7)
2.6 3.65
-75 -88
-92 -105
-92 -105
Units
(Limits)
dB (max)
dB (min)
dB (max)
dB (max)
Electrical Characteristics for Microphone Preamp and Power Supply
(Notes 1, 2)
The following specifications apply forVDD = 5V unless otherwise noted. Limits apply for TA= 25˚C.
Symbol
Parameter
Conditions
LM4834
Typical
(Note 6)
Limit
(Note 7)
VOS
SNR
Offset Voltage
Signal to Noise Ratio
VSWING
ENO
PSRR
Output Voltage Swing
Input Referred Noise
Power Supply Rejection Ratio
VS Mic Power Supply
VIN = 0V
VDD = 5V, RL = 1k, f = 1 kHz, VOUT =
4.7V, A-Wtd Filter
f = 1 kHz, THD < 1.0%, RL = 1 k
A-Weighted Filter
f = 120 Hz, VRIPPLE= 200 mVrms,
CB=1µF
RL = 1 k, Bias In = 2.5V
0.9
123
4.72
1.2
28
2.5
2.5
Units
(Limits)
mV
dB
V
µV
dB
V (min)
www.national.com
2


Part Number LM4834
Description 1.75W Audio Power Amplifier
Maker National Semiconductor
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LM4834 Datasheet PDF






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