LM4830M National Semiconductor, LM4830M Datasheet

IC AMP AUDIO PWR 2W MONO 24SOIC

LM4830M

Manufacturer Part Number
LM4830M
Description
IC AMP AUDIO PWR 2W MONO 24SOIC
Manufacturer
National Semiconductor
Type
Class ABr
Datasheet

Specifications of LM4830M

Output Type
1-Channel (Mono) with Mono Headphones
Max Output Power X Channels @ Load
2W x 1 @ 4 Ohm; 100mW x 1 @ 32 Ohm
Voltage - Supply
2.7 V ~ 5.5 V
Features
Microphone, Shutdown, Thermal Protection, Volume Control
Mounting Type
Surface Mount
Package / Case
24-SOIC (7.5mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
*LM4830M

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM4830MX
Manufacturer:
NS/国半
Quantity:
20 000
© 2000 National Semiconductor Corporation
LM4830
Two-Way Audio Amplification System
with Volume Control
General Description
The LM4830 is an integrated solution for two-way audio am-
plification. It contains a bridge-connected audio power ampli-
fier capable of delivering 1W of continuous average power to
an 8
It also has the capability of driving 100 mW into a
single-ended 32
is a 30 dB attenuator in front of a bridged power amplifier
with 6 dB of gain. The attenuation is controlled through 4 bits
of parallel digital control; 15 steps of 2 dB each.
The device also contains a microphone preamp with two se-
lectable inputs. Mic2 is selected when HS is high and A1 is in
single-ended mode. Mic1 is selected when HS is low and A1
is in bridged mode. This configuration is optimum for switch-
ing between an internal system speaker and external head-
set with microphone. The device also incorporates a buffer
used for driving capacitive loads.
The LM4830 also provides a low-current consumption shut-
down mode making it optimally suited for low-power portable
systems. In addition, the device has an internal thermal shut-
down protection mechanism.
Connection Diagram
load with less than 1% THD from a 5V power supply.
impedance for headset operation. There
DS012677
See NS Package Number M24B for SO
See NS Package Number N24A for DIP
Small Outline Packages
Order Number LM4830M
Order Number LM4830N
Dual-In-Line and
Top View
Key Specifications
n THD at 1W cont. avg P
n Instantaneous peak output power: 1.4W
n Shutdown current: 0.5 µA (typ)
n Supply voltage range: 2.7V
Features
n 4-bit digital control for 30 dB of volume attenuation
n Two selectable microphone inputs
n High performance microphone preamp
n Extra buffer for driving long cables
n No bootstrap capacitors or snubber circuits are
n Small Outline (SO) packaging
n Thermal shutdown protection circuitry
Applications
n Hands-free phone systems
n Mobile phone accessories
n Desktop conference phones
n Portable computers
n Teleconference computer applications
necessary
DS012677-2
O
into 8 :
V
DD
1% (max)
5.5V
January 1999
www.national.com

Related parts for LM4830M

LM4830M Summary of contents

Page 1

... Mobile phone accessories n Desktop conference phones n Portable computers n Teleconference computer applications Dual-In-Line and Small Outline Packages DS012677-2 Top View Order Number LM4830M See NS Package Number M24B for SO Order Number LM4830N See NS Package Number N24A for DIP DS012677 January 1999 into (max) ...

Page 2

Typical Application www.national.com FIGURE 1. Typical Application Circuit 2 DS012677-1 ...

Page 3

... 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 (Note 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction Temperature Soldering Information Small Outline Package Vapor Phase (60 sec ...

Page 4

... kHz DDAC IHF-A Weighting Filter mW kHz Power Amp 1W kHz O L − the number given in the Absolute Maximum Ratings, whichever is lower. For the LM4830M resistor 25˚C. A LM4830 (Limits) Typical Limit (Note 6) (Note 7) − 2.0 5.8 0.5 − and the ambient temperature, T ...

Page 5

Computer Application Circuit FIGURE 2. 5 DS012677-4 www.national.com ...

Page 6

Typical Performance Characteristics Output Power vs Supply Voltage DS012677-5 Output Power vs Supply Voltage DS012677-8 THD + N vs Output Power DS012677-11 THD + N vs Output Power DS012677-14 www.national.com (Power Amp-Bridged) Wideband Noise Floor DS012677-6 Output Power vs Supply ...

Page 7

Typical Performance Characteristics THD + N vs Output Power DS012677-17 THD + N vs Output Power DS012677-20 THD + N vs Output Power DS012677-23 THD + N vs Output Power DS012677-26 (Power Amp-Bridged) (Continued) THD + N vs Output Power ...

Page 8

Typical Performance Characteristics THD + N vs Output Power DS012677-29 Wideband Noise Floor DS012677-32 Output Attenuation in Shutdown Mode DS012677-35 Supply Current vs Supply Voltage DS012677-38 www.national.com (Power Amp-Bridged) (Continued) Power Amp Crosstalk to Preamp and Buffer DS012677-30 Wideband Noise ...

Page 9

Application Information POWER AMPLIFIER HANDSFREE MODE As shown in Figure 1 , amplifier A1 can be used in one of two modes, bridged output or single-ended output. This IC was intended to be used in systems requiring both internal speaker ...

Page 10

Application Information ground return lines should not be tied together with AC input reference ground return lines. In addition, the layout of these ground lines should be physically located as far as reason- ably possible from each other so that ...

Page 11

Application Information This feature is especially useful when the IC is used in por- table battery operated systems where energy conservation is imperative. In many applications, a microcontroller or microprocessor output interfaces to the LM4830 shutdown pin, providing a quick, ...

Page 12

... Physical Dimensions 24-Lead (0.300" Wide) Molded Small Outline Package, JEDEC 24-Lead (0.600" Wide) Molded Dual-In-Line Package www.national.com inches (millimeters) unless otherwise noted Order Number LM4830M NS Package Number M24B Order Number LM4830N NS Package Number N24A 12 ...

Page 13

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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