LM4938MH Datasheet

IC型號：
LM4938MH
PDF描述：
National Semiconductor [Stereo 2W Audio Power Amplifiers wi...
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LM4938 Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain

February 2005

LM4938

Stereo 2W Audio Power Amplifiers

with DC Volume Control and Selectable Gain

General Description

The LM4938 is a monolithic integrated circuit that provides

DC volume control, and stereo bridged audio power amplifi-

ers capable of producing 2W into 4鈩?(Note 1) with less than

1.0% THD or 2.2W into 3鈩?(Note 2) with less than 1.0%

THD.

Boomer

廬

audio integrated circuits were designed specifically

to provide high quality audio while requiring a minimum

amount of external components. The LM4938 incorporates a

DC volume control, stereo bridged audio power amplifiers

and a selectable gain or bass boost, making it optimally

suited for multimedia monitors, portable radios, desktop, and

portable computer applications.

The LM4938 features an externally controlled, low-power

consumption shutdown mode, and both a power amplifier

and headphone mute for maximum system flexibility and

performance.

Note 1:

When properly mounted to the circuit board, LM4938MH will deliver

2W into 4鈩? See

Application Information

section

Exposed-DAP package

PCB Mounting Considerations

for more information.

Note 2:

An LM4938MH that has been properly mounted to the circuit board

and forced-air cooled will deliver 2.2W into 3鈩?

Key Specifications

at 1% THD+N

into 3鈩?/div>

into 4鈩?/div>

into 8鈩?/div>

Single-ended mode - THD+N at 92mW into

32鈩?/div>

Shutdown current

2.2W (typ)

2.0W (typ)

1.3W (typ)

1.0%(typ)

0.5碌A(chǔ) (typ)

Features

Improved click and pop circuitry virtually eliminates

noise during turn on/off transitions

DC Volume Control Interface

System Beep Detect

Stereo switchable bridged/single-ended power amplifiers

Selectable internal/external gain and bass boost

Thermal shutdown protection circuitry

Unity gain stable

Applications

Flat Panel Displays

Portable and Desktop Computers

Multimedia Monitors

Portable Radios, PDAs, and Portable TVs

Block Diagram

20095601

FIGURE 1. LM4938 Block Diagram

Boomer

廬

is a registered trademark of NationalSemiconductor Corporation.

漏 2005 National Semiconductor Corporation

DS200956

www.national.com

制造商
National Semiconductor (TI)
產(chǎn)品
Class-AB
輸出功率
2.2 W x 2 at 3 Ohms, 0.092 W x 2 at 32 Ohms
輸出類型
2-Channel Stereo
THD + 噪聲
0.05 %
工作電源電壓
3 V, 5 V
最大工作溫度
+ 85 C
安裝風格
SMD/SMT
封裝 / 箱體
TSSOP EP
封裝
Tube
音頻負載電阻
32 Ohms
輸入信號類型
Single
最小工作溫度
- 20 C
輸出信號類型
Differential, Single
電源類型
Single
Supply Voltage - Max
5.5 V
Supply Voltage - Min
2.7 V

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LM4938MH Datasheet

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