IC, AUDIO PWR AMP CLASS AB 1.75W SSOP-28

LM4834MS

Manufacturer Part NumberLM4834MS
DescriptionIC, AUDIO PWR AMP CLASS AB 1.75W SSOP-28
ManufacturerNational Semiconductor
LM4834MS datasheet
 


Specifications of LM4834MS

Amplifier ClassABNo. Of Channels1
Output Power1.75WSupply Voltage Range4.5V to 5.5V
Load Impedance8ohmOperating Temperature Range-40°C to +85°C
Amplifier Case StyleSSOPRohs CompliantNo
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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
capable of producing 1.75W into 4Ω with less than 1.0%
(THD). In addition, the headphone/lineout amplifier is ca-
pable of driving 70 mW into 32Ω with less than 0.1%(THD).
The LM4834 incorporates a volume control and an input
microphone preamp stage capable of driving a 1 kΩ load
impedance.
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.
Block Diagram
FIGURE 1. LM4834 Block Diagram
Boomer
®
is a registered trademark of NationalSemiconductor Corporation.
© 2004 National Semiconductor Corporation
Key Specifications
n THD at 1.1W continuous average output power into 8Ω
at 1kHz
n Output Power into 4Ω at 1.0% THD+N
n THD at 70mW continuous average output power into
32Ω at 1kHz
n Shutdown Current
n Supply Current
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
Connection Diagram
See NS Package Number MSA028CB for SSOP
10001501
DS100015
August 2000
0.5% (max)
1.75W (typ)
0.1% (typ)
1.0µA (max)
17.5mA (typ)
SSOP Package
10001502
Top View
Order Number LM4834MS
www.national.com

LM4834MS Summary of contents

  • Page 1

    ... Thermal shutdown protection circuitry Applications n Multimedia Monitors n Desktop and Portable Computers Connection Diagram See NS Package Number MSA028CB for SSOP 10001501 DS100015 August 2000 0.5% (max) 1.75W (typ) 0.1% (typ) 1.0µA (max) 17.5mA (typ) SSOP Package 10001502 Top View Order Number LM4834MS www.national.com ...

  • Page 2

    ... Absolute Maximum Ratings 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 ...

  • Page 3

    ... 1.0 µ 120 Hz,V B RIPPLE 200 mVmrs 1.1W OUT A-Wtd Filter − T )/θ .For the LM4834MS 150˚C, and the typical junction-to-ambient thermal resistance, when board A JA JMAX 3 = 25˚C. A LM4834 Typical Limit (Note 6) (Note 7) 2.5 2.5 LM4834 ...

  • Page 4

    Typical Application Truth Table for Logic Inputs Mode Mute www.national.com FIGURE 2. Typical Application Circuit HP Sense DC Vol. Control Line/HP Left 0 Adjustable Fixed Level 1 Adjustable ...

  • Page 5

    External Components Description Components Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also creates a high i pass filter with explanation of how to determine the value ...

  • Page 6

    Typical Performance Characteristics THD+N vs Frequency Bridge Power Amp THD+N vs Frequency Line Out/HP Amplifiers THD+N vs Output Power Bridged Power Amp www.national.com (Continued) THD+N vs Frequency Line Out/HP Amplifiers 10001506 THD+N vs Frequency Line Out/HP Amplifiers 10001508 THD+N vs ...

  • Page 7

    Typical Performance Characteristics THD+N vs Output Power Bridged Power Amp THD+N vs Output Power Line Out/HP Amplifiers Output Power vs Load Resistance Bridged Power Amp (Continued) THD+N vs Output Power 10001512 THD+N vs Output Power 10001514 10001516 7 Line Out/HP ...

  • Page 8

    Typical Performance Characteristics Volume Control Characteristics Noise Floor Line Out/HP Amp Power Supply Rejection Ratio Bridged Power Amp www.national.com (Continued) 10001525 10001520 Line Out/HP Amplifiers 10001522 8 Noise Floor Bridged Power Amp 10001519 Noise Floor Mic Preamp 10001521 Power Supply ...

  • Page 9

    Typical Performance Characteristics Power Supply Rejection Ratio Mic Preamp Power Dissipation vs Output Power Line Out/HP Amplifiers Power Derating Curve (Continued) 10001524 Low Frequency Enhancement 10001526 10001528 9 Power Dissipation vs Output Power Bridged Power Amp 10001518 Characteristics Bridged Power ...

  • Page 10

    Typical Performance Characteristics Crosstalk Line Out/HP Amplifiers www.national.com (Continued) 10001530 10 ...

  • Page 11

    Application Information BEEP IN FUNCTION The Beep In pin (pin 14 mono input, for system beeps, that is mixed into the left and right input. This Beep In pin will allow an input signal to pass through to ...

  • Page 12

    Application Information amplifiers are set at a gain of 1.4 (2.9dB). The attenuation of the amplifiers increase until 0V is reached. The attenuator range is from 2.9dB (pin22 = 4V) to -75dB (pin22 = 0V). Any DC voltage greater than ...

  • Page 13

    Application Information ability to reproduce signals below 100 Hz–150 Hz. In this case, usinga large input or output capacitor may not in- crease system performance. In addition to system cost and size, click and pop perfor- mance is effected by ...

  • Page 14

    ... Deutsch Tel: +49 (0) 69 9508 6208 English www.national.com Français Tel: +33 ( 8790 SSOP Package Order Number LM4834MS NS Package Number MSA028CB for SSOP 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness ...