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参数资料
| 型号： | LM4894MWC |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, UUC |
| 封装： | WAFER |
| 文件页数： | 1/21页 |
| 文件大小： | 781K |
| 代理商： | LM4894MWC |
LM4894
1 Watt Fully Differential Audio Power Amplifier With
Shutdown Select
General Description
The LM4894 is a fully differential audio power amplifier
primarily designed for demanding applications in mobile
phones and other portable communication device applica-
tions. It is capable of delivering 1 watt of continuous average
power to an 8
BTL load with less than 1% distortion
(THD+N) from a 5V
DC power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4894 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.
The LM4894 features a low-power consumption shutdown
mode. To facilitate this, Shutdown may be enabled by either
logic high or low depending on mode selection. Driving the
shutdown mode pin either high or low enables the shutdown
select pin to be driven in a likewise manner to enable Shut-
down. Additionally, the LM4894 features an internal thermal
shutdown protection mechanism.
The LM4894 contains advanced pop & click circuitry which
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4894 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
j Improved PSRR at 217Hz
80dB(typ)
j Power Output at 5.0V & 1% THD
1.0W(typ)
j Power Output at 3.3V & 1% THD
400mW(typ)
j Shutdown Current
0.1A(typ)
Features
n
Fully differential amplification
n
Available in space-saving packages micro SMD, MSOP,
and LLP
n
Ultra low current shutdown mode
n
Can drive capacitive loads up to 500 pF
n
Improved pop & click circuitry eliminates noises during
turn-on and turn-off transitions
n
2.2 - 5.5V operation
n
No output coupling capacitors, snubber networks or
bootstrap capacitors required
n
Unity-gain stable
n
External gain configuration capability
n
Shutdown high or low selectivity
n
High CMRR
Applications
n
Mobile phones
n
PDAs
n
Portable electronic devices
Typical Application
Boomer is a registered trademark of National Semiconductor Corporation.
20013701
FIGURE 1. Typical Audio Amplifier Application Circuit
July 2002
LM4894
1
W
att
Fully
Differential
Audio
Power
Amplifier
W
ith
Shutdown
Select
2002 National Semiconductor Corporation
DS200137
www.national.com
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| LM4895MDC | 0.35 W, 1 CHANNEL, AUDIO AMPLIFIER, UUC |
| LM4895MWC | 0.35 W, 1 CHANNEL, AUDIO AMPLIFIER, UUC |
| LM4895MM/NOPB | 0.35 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO10 |
| LM4895LD/NOPB | 1.4 W, 1 CHANNEL, AUDIO AMPLIFIER, DSO10 |
| LM4895MMX/NOPB | 0.35 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO10 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4895 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:1 Watt Fully Differential Audio Power Amplifier With Shutdown Select and Fixed 6dB Gain |
| LM4895A E WAF | 制造商:Texas Instruments 功能描述: |
| LM4895IBP | 制造商:NSC 制造商全称:National Semiconductor 功能描述:1 Watt Fully Differential Audio Power Amplifier With Shutdown Select and Fixed 6dB Gain |
| LM4895IBP/NOPB | 功能描述:IC AMP AUDIO PWR 1.4W MONO 9USMD RoHS:是 类别:集成电路 (IC) >> 线性 - 音頻放大器 系列:Boomer® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:DirectDrive® 类型:H 类 输出类型:耳机，2-通道（立体声） 在某负载时最大输出功率 x 通道数量:35mW x 2 @ 16 欧姆 电源电压:1.62 V ~ 1.98 V 特点:I²C，麦克风，静音，短路保护，音量控制 安装类型:表面贴装 供应商设备封装:25-WLP（2.09x2.09） 封装/外壳:25-WFBGA，WLCSP 包装:带卷 (TR) |
| LM4895IBPX | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
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