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LM4548 PDF预览

LM4548

更新时间: 2024-01-04 12:34:50
品牌 Logo 应用领域
美国国家半导体 - NSC 解码器编解码器
页数 文件大小 规格书
18页 325K
描述
AC ’97 Rev 2 Codec with Sample Rate Conversion and National 3D Sound

LM4548 技术参数

是否Rohs认证: 符合生命周期:Obsolete
包装说明:LFQFP, QFP48,.35SQ,20Reach Compliance Code:compliant
HTS代码:8542.39.00.01风险等级:5.68
商用集成电路类型:CONSUMER CIRCUITJESD-30 代码:S-PQFP-G48
JESD-609代码:e3长度:7 mm
湿度敏感等级:3功能数量:1
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:LFQFP封装等效代码:QFP48,.35SQ,20
封装形状:SQUARE封装形式:FLATPACK, LOW PROFILE, FINE PITCH
峰值回流温度(摄氏度):260电源:5 V
认证状态:Not Qualified座面最大高度:1.6 mm
子类别:Other Consumer ICs最大供电电压 (Vsup):5.5 V
最小供电电压 (Vsup):4.2 V表面贴装:YES
技术:CMOS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:QUAD
处于峰值回流温度下的最长时间:NOT SPECIFIED宽度:7 mm
Base Number Matches:1

LM4548 数据手册

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February 1999  
LM4548  
AC ’97 Rev 2 Codec with Sample Rate Conversion and  
National 3D Sound  
General Description  
Key Specifications  
The LM4548 is an audio codec for PC systems which is fully  
PC98 compliant and performs the analog intensive functions  
of the AC97 Rev2 architecture. Using 18-bit Sigma-Delta  
A/D’s and D/A’s, the LM4548 provides 90dB of Dynamic  
Range.  
n Analog Mixer Dynamic Range  
n D/A Dynamic Range  
97dB (typ)  
89dB (typ)  
90dB (typ)  
n A/D Dynamic Range  
The LM4548 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 A/D’s and D/A’s  
and an analog mixer with 4 stereo and 3 mono inputs, each  
of which has separate gain, attenuation and mute control.  
The LM4548 also provides the additional True Line-Level  
output and National’s 3D Sound stereo enhancement.  
Features  
n AC’97 Rev2 compliant  
n National’s 3D Sound circuitry  
n High quality Sample Rate Conversion (SRC) from 4kHz  
to 48kHz in 1Hz increments.  
n Multiple Codec Support  
n True Line Level Output with volume control in addition to  
standard Line Out  
n Advanced power management support  
n Digital 3V and 5V compliant  
The LM4548 supports variable sample rate conversion as  
defined in the AC97 Rev2 specification. The sample rate for  
the A/D and D/A can be programmed separately to convert  
any rate between 4kHz - 48kHz with a resolution of 1Hz. The  
AC97 architecture separates the analog and digital functions  
of the PC audio system allowing both for system design flex-  
ibility and increased performance.  
Applications  
n Desktop PC Audio Systems  
n Portable PC Systems  
n Mobile PC Systems  
Block Diagram  
DS100987-1  
FIGURE 1. LM4548 Block Diagram  
© 1999 National Semiconductor Corporation  
DS100987  
www.national.com  

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