Datasheet > LM4922

LM4922

更新时间： 2024-01-23 02:03:17

品牌	Logo	应用领域
美国国家半导体 - NSC		放大器
页数	文件大小	规格书
21页	1233K
描述
Ground-Referenced, Ultra Low Noise, Fixed Gain, 80mW Stereo Headphone Amplifier

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LM4922 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
包装说明：	FBGA, BGA14,4X4,20	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.33.00.01
Factory Lead Time：	1 week	风险等级：	5.81
商用集成电路类型：	AUDIO AMPLIFIER	JESD-30 代码：	S-PBGA-B14
JESD-609代码：	e1	湿度敏感等级：	1
功能数量：	2	端子数量：	14
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	FBGA
封装等效代码：	BGA14,4X4,20	封装形状：	SQUARE
封装形式：	GRID ARRAY, FINE PITCH	峰值回流温度（摄氏度）：	260
电源：	3 V	认证状态：	Not Qualified
子类别：	Audio/Video Amplifiers	最大压摆率：	10 mA
表面贴装：	YES	技术：	CMOS
温度等级：	INDUSTRIAL	端子面层：	Tin/Silver/Copper (Sn/Ag/Cu)
端子形式：	BALL	端子节距：	0.5 mm
端子位置：	BOTTOM	处于峰值回流温度下的最长时间：	NOT SPECIFIED
Base Number Matches：	1

LM4922 数据手册

December 2005

LM4922

Ground-Referenced, Ultra Low Noise, Fixed Gain, 80mW

Stereo Headphone Amplifier

General Description

Key Specifications

The LM4922 is a ground referenced, fixed-gain audio power

amplifier capable of delivering 80mW of continuous average

power into a 16Ω single-ended load with less than 1%

THD+N from a 3V power supply.

Improved PSRR at 217Hz

Power Output at V_DD= 3V,

R_L= 16Ω, THD % 1%

Shutdown Current

70dB (typ)

80mW (typ)

0.01µA (typ)

1.5V/V (typ)

1.6V to 4.2V

The LM4922 features a new circuit technology that utilizes a

charge pump to generate a negative reference voltage. This

allows the outputs to be biased about ground, thereby elimi-

nating output-coupling capacitors typically used with normal

single-ended loads.

Internal Fixed Gain

Operating Voltage

The LM4922 features an Automatic Standby Mode circuitry

(patent pending). In the absence of an input signal, after

approximately 12 seconds, the LM4922 goes into low cur-

rent standby mode. The LM4922 recovers into full power

operating mode immediately after a signal is applied to either

the left or right input pins. This feature saves power supply

current in battery operated applications.

Features

n Fixed Logic Levels

n Ground referenced outputs

n High PSRR

n Available in space-saving micro SMD package

n Ultra low current shutdown mode

n Improved pop & click circuitry eliminates noises during

turn-on and turn-off transitions

n No output coupling capacitors, snubber networks,

bootstrap capacitors, or gain-setting resistors required

n Shutdown either channel independently

Boomer audio power amplifiers were designed specifically to

provide high quality output power with a minimal amount of

external components. The LM4922 does not require output

coupling capacitors or bootstrap capacitors, and therefore is

ideally suited for mobile phone and other low voltage appli-

cations where minimal power consumption is a primary re-

quirement.

Applications

n Notebook PCs

n Mobile Phone

n PDAs

n Portable electronic devices

n MP3 Players

The LM4922 features a low-power consumption shutdown

mode selectable for either channel separately. This is ac-

complished by driving either the SD_RC (Shutdown Right

Channel) or SD_LC (Shutdown Left Channel) (or both) pins

with logic low, depending on which channel is desired shut-

down. Additionally, the LM4922 features an internal thermal

shutdown protection mechanism.

The LM4922 contains advanced pop & click circuitry that

eliminates noises which would otherwise occur during

turn-on and turn-off transitions.

The LM4922 has an internal fixed gain of 1.5V/V.

Boomer^®is a registered trademark of National Semiconductor Corporation.

DS201582

www.national.com

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