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LM4830M Datasheet

  • LM4830M

  • National Semiconductor [Two-Way Audio Amplification System ...

  • 461.53KB

  • NSC

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LM4830 Two-Way Audio Amplification System with Volume Control
January 1999
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鈩?load with less than 1% THD from a 5V power supply.
It also has the capability of driving 100 mW into a
single-ended 32鈩?impedance for headset operation. There
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.
Key Specifications
n
n
n
n
THD at 1W cont. avg P
O
into 8鈩? 1% (max)
Instantaneous peak output power: 1.4W
Shutdown current: 0.5 碌A(chǔ) (typ)
Supply voltage range: 2.7V
鈮?/div>
V
DD
鈮?/div>
5.5V
Features
4-bit digital control for 30 dB of volume attenuation
Two selectable microphone inputs
High performance microphone preamp
Extra buffer for driving long cables
No bootstrap capacitors or snubber circuits are
necessary
n
Small Outline (SO) packaging
n
Thermal shutdown protection circuitry
n
n
n
n
n
Applications
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n
n
Hands-free phone systems
Mobile phone accessories
Desktop conference phones
Portable computers
Teleconference computer applications
Connection Diagram
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
漏 1999 National Semiconductor Corporation
DS012677
www.national.com

LM4830M PDF文件相關(guān)型號(hào)

LM4830N

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