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LM4549AVHX/NOPB PDF预览

LM4549AVHX/NOPB

更新时间： 2024-01-13 02:17:54
品牌 Logo 应用领域
德州仪器 - TI 商用集成电路
页数 文件大小 规格书
28页 537K
描述
IC,SOUNDCARD CIRCUITS,QFP,48PIN,PLASTIC

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中文翻译

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LM4549AVHX/NOPB 技术参数

是否Rohs认证：符合生命周期：Obsolete
包装说明：QFP, QFP48,.35SQ,20Reach Compliance Code：compliant
风险等级：5.84Is Samacsys：N
商用集成电路类型：CONSUMER CIRCUITJESD-30 代码：S-PQFP-G48
JESD-609代码：e3湿度敏感等级：3
端子数量：48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：QFP封装等效代码：QFP48,.35SQ,20
封装形状：SQUARE封装形式：FLATPACK
电源：5 V认证状态：Not Qualified
子类别：Other Consumer ICs表面贴装：YES
温度等级：INDUSTRIAL端子面层：Matte Tin (Sn)
端子形式：GULL WING端子节距：0.5 mm
端子位置：QUADBase Number Matches：1

LM4549AVHX/NOPB 数据手册

 浏览型号LM4549AVHX/NOPB的Datasheet PDF文件第2页浏览型号LM4549AVHX/NOPB的Datasheet PDF文件第3页浏览型号LM4549AVHX/NOPB的Datasheet PDF文件第4页浏览型号LM4549AVHX/NOPB的Datasheet PDF文件第5页浏览型号LM4549AVHX/NOPB的Datasheet PDF文件第6页浏览型号LM4549AVHX/NOPB的Datasheet PDF文件第7页 
May 2004  
LM4549A  
AC ’97 Rev 2.1 Multi-Channel Audio Codec with Sample  
Rate Conversion and National 3D Sound  
General Description  
Key Specifications  
n Analog Mixer Dynamic Range  
n DAC Dynamic Range  
97 dB (typ)  
89 dB (typ)  
90 dB (typ)  
The LM4549A is an audio codec for PC systems which is  
fully PC99 compliant and performs the analog intensive  
functions of the AC ’97 Rev 2.1 architecture. Using 18-bit  
Sigma-Delta ADCs and DACs, the LM4549A provides 90 dB  
of Dynamic Range.  
n ADC Dynamic Range  
Features  
The LM4549A was designed specifically to provide a high  
quality audio path and provide all analog functionality in a PC  
audio system. It features full duplex stereo ADCs and DACs  
and analog mixers with access to 4 stereo and 4 mono  
inputs. Each mixer input has separate gain, attenuation and  
mute control and the mixers drive 1 mono and 2 stereo  
outputs, each with attenuation and mute control. The  
LM4549A supports National’s 3D Sound stereo enhance-  
ment and a comprehensive sample rate conversion capabil-  
ity. The sample rate for the ADCs and DACs can be pro-  
grammed separately with a resolution of 1 Hz to convert any  
rate in the range 4 kHz – 48 kHz. Sample timing from the  
ADCs and sample request timing for the DACs are com-  
pletely deterministic to ease task scheduling and application  
software development. These features together with an ex-  
tended temperature range also make the LM4549A suitable  
for non-PC codec applications.  
n AC ’97 Rev 2.1 compliant  
n High quality Sample Rate Conversion from 4 kHz to 48  
kHz in 1 Hz increments  
n Multiple codec support  
n True Line Level Output with separate gain control  
n National’s 3D Sound stereo enhancement circuitry  
n Advanced power management support  
n External Amplifier Power Down (EAPD) control  
n PC-Beep passthrough to Line Out during Initialization or  
Cold Reset  
n Digital 3.3V and 5V supply options  
n Extended Temperature: −40˚C ≤ TA ≤ 85˚C  
Applications  
n Desktop PC audio systems on PCI cards, AMR cards, or  
with motherboard chips sets featuring AC Link  
n Portable PC systems as on MDC cards, or with a  
chipset or accelerator featuring AC Link  
The LM4549A features the ability to connect several codecs  
together using the Extended AC Link configuration of one  
dedicated serial data signal to the Controller per codec.  
LM4549A systems support up to 8 simultaneous channels of  
streaming data on Input Frames (Codec to Controller) while  
Output Frames (Controller to Codec) carry 2 streams to  
multiple codecs. The LM4549A may also be used in systems  
with the National LM4550 to support up to 6 simultaneous  
channels of streaming data on Output Frames.  
n General and Multi-channel audio frequency systems  
The AC ’97 architecture separates the analog and digital  
functions of the PC audio system allowing both for system  
design flexibility and increased performance.  
© 2004 National Semiconductor Corporation  
DS200299  
www.national.com  
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