您的位置：维库电子市场网 > Datasheet > LM4949TL

LM4949TL Datasheet

  • LM4949TL

  • National Semiconductor [Stereo Class D Audio Subsystem with...

  • 1776.00KB

  • NSC

阅览下载 纠错 0

扫码查看芯片数据手册

上传产品规格书

PDF预览

LM4949 Stereo Class D Audio Subsystem with OCL Headphone Amplifier
September 2006
LM4949
Stereo Class D Audio Subsystem with OCL Headphone
Amplifier
General Description
The LM4949 is a fully integrated audio subsystem designed
for stereo cell phone applications. The LM4949 combines a
2.5W stereo Class D amplifier plus a separate 190mW ste-
reo headphone amplifier, volume control, and input mixer
into a single device. The filterless class D amplifiers deliver
1.19W/channel into an 8鈩?load with
<
1% THD+N from a 5V
supply. The headphone amplifier features National鈥檚 Output
Capacitor-less (OCL) architecture that eliminates the output
coupling capacitors required by traditional headphone ampli-
fiers. Additionally, the headphone amplifiers can be config-
ured with capacitively coupled (CC)loads, or used to drive an
external headphone amplifier. When configured for an exter-
nal amplifier, the V
DD
/2 output (VOC) controls the external
amplifier鈥檚 shutdown input.
For improved noise immunity, the LM4949 features fully
differential left, right and mono inputs. The three inputs can
be mixed/multiplexed to either the speaker or headphone
amplifiers. The left and right inputs can be used as separate
single-ended inputs, mixing multiple stereo audio sources.
The mixer, volume control, and device mode select are
controlled through an I
2
C compatible interface.
Output short circuit and thermal shutdown protection prevent
the device from being damaged during fault conditions. Su-
perior click and pop suppression eliminates audible tran-
sients on power-up/down and during shutdown.
Key Specifications
j
Efficiency V
DD
= 3.6V, 400mW into 8鈩?/div>
j
Efficiency V
DD
= 5V, 1W into 8鈩?/div>
j
Quiescent Power Supply Current
@
3.6V
j
Power Output at V
DD
= 5V
86.5%
87.4%
9.36mA
Speaker:
R
L
= 4鈩? THD+N
鈮?/div>
1%
R
L
= 8鈩? THD+N
鈮?/div>
1%
R
L
= 4鈩? THD+N
鈮?/div>
10%
Headphone:
R
L
= 16鈩? THD+N
鈮?/div>
1%
R
L
= 32鈩? THD+N
鈮?/div>
1%
j
Shutdown Current
2W
1.19W
2.5W
153mW
89mW
0.1碌A
Features
n
n
n
n
n
n
n
n
n
n
n
n
Output Short Circuit Protection
Thermal Shutdown
Stereo filterless Class D operation
Selectable OCL/CC Headphone Drivers
RF Suppression
I
2
C Control Interface
32-step digital volume control
Independent Speaker and Headphone Gain Settings
Minimum external components
Click and Pop suppression
Micro-power shutdown
Available in space-saving 25 bump 碌SMD package
Applications
n
Mobile phones
n
PDAs
n
Laptops
Boomer
庐
is a registered trademark of National Semiconductor Corporation.
漏 2006 National Semiconductor Corporation
DS202001
www.national.com

LM4949TL相关型号PDF文件下载

  • 型号
    版本
    描述
    厂商
    下载
  • LM494
    英文版
    Pulse Width Modulated Control Circuit
    NSC
    LM494
  • LM494
    英文版
    Pulse Width Modulated Control Circuit
    national
    LM494
  • LM4900
    英文版
    265mW at 3.3V Supply Audio Power Amplifier with Shutdown Mod...
    NSC
    LM4900
  • LM4900
    英文版
    265mW at 3.3V Supply Audio Power Amplifier with Shutdown Mod...
    NATIONAL
    LM4900
  • LM4901
    英文版
    ETC
    LM4901
  • LM4901
    英文版
    1.6 Watt Audio Power Amplifier with Selectable Shutdown Logi...
    NSC
    LM4901
  • LM4901
    英文版
    1.6 Watt Audio Power Amplifier with Selectable Shutdown Logi...
    NATIONAL
    LM4901
  • LM4902
    英文版
    265mW at 3.3V Supply Audio Power Amplifier with Shutdown Mod...
    NSC
    LM4902
  • LM4902
    英文版
    265mW at 3.3V Supply Audio Power Amplifier with Shutdown Mod...
    NATIONAL
    LM4902
  • LM4903
    英文版
    1 Watt Audio Power Amplifier
    NSC
    LM4903
  • LM4903
    英文版
    1 Watt Audio Power Amplifier
    NATIONAL
    LM4903
  • LM4904
    英文版
    1 Watt Audio Power Amplifier
    NSC
    LM4904
  • LM4904
    英文版
    1 Watt Audio Power Amplifier
    NATIONAL
    LM4904
  • LM4905
    英文版
    1 Watt Audio Power Amplifier
    NSC
    LM4905
  • LM4905
    英文版
    1 Watt Audio Power Amplifier
    LM4905
  • LM4906
    英文版
    1W, Bypass-Capacitor-less Audio Amplifier with Internal Sele...
    NSC
    LM4906
  • LM4906
    英文版
    1W, Bypass-Capacitor-less Audio Power Amplifier with Interna...
    LM4906
  • LM4907
    英文版
    National Semiconductor [1 Watt Audio Power Amplifier]
    NSC
    LM4907
  • LM4908
    英文版
    10kV ESD Rated, Dual 120 mW Headphone Amplifier
    NSC
    LM4908
  • LM4908
    英文版
    LM4908 10kV ESD Rated Dual 120mW Headphone Amplifier
    NATIONAL
    LM4908

您可能感兴趣的PDF文件资料

热门IC型号推荐

©2025 维库电子市场网（www.dzsc.com）　备案号：浙B2-20050339-1 经营许可证：浙B2-20210386版权声明
买家服务热线：0571-85317607 | 买家服务部QQ： QQ:1609526468
卖家服务热线：0571-85317607 | 卖家服务部QQ： QQ:331652727

扫码下载APP，
一键连接广大的电子世界。

在线人工客服

买家服务：
卖家服务：
技术客服：

0571-85317607

网站技术支持

13606545031

客服在线时间周一至周五
9:00-17:30

关注官方微信号，
第一时间获取资讯。

建议反馈
返回顶部

建议反馈

联系人：

联系方式：

按住滑块，拖拽到最右边
>>
感谢您向阿库提出的宝贵意见，您的参与是维库提升服务的动力！意见一经采纳，将有感恩红包奉上哦！

PDF纠错X

投诉电话：0571-85317607 投诉QQ：

如选匿名将无法为您反馈投诉结果，建议实名投诉！