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LM4545 PDF预览

LM4545

更新时间: 2024-02-17 23:52:13
品牌 Logo 应用领域
美国国家半导体 - NSC 解码器编解码器放大器
页数 文件大小 规格书
16页 330K
描述
AC ’97 Codec with Stereo Headphone Amplifier and National 3D Sound

LM4545 技术参数

是否Rohs认证: 不符合生命周期:Obsolete
包装说明:LFQFP, QFP48,.35SQ,20Reach Compliance Code:unknown
HTS代码:8542.39.00.01风险等级:5.75
商用集成电路类型:CONSUMER CIRCUITJESD-30 代码:S-PQFP-G48
JESD-609代码:e0长度:7 mm
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):NOT SPECIFIED
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):4.5 V
表面贴装:YES技术:CMOS
温度等级:INDUSTRIAL端子面层:Tin/Lead (Sn/Pb)
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 mmBase Number Matches:1

LM4545 数据手册

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PRELIMINARY  
July 1999  
LM4545  
AC ’97 Codec with Stereo Headphone Amplifier and  
National 3D Sound  
General Description  
Key Specifications  
The LM4545 is an audio codec for PC systems which per-  
forms the analog-intensive function of the Analog Codec ’97  
Rev 1.03 Architecture. Using 18-Bit Σ∆ A/D and D/A convert-  
ers, the LM4545 provides 90dB of dynamic range.  
n Analog Mixer Dynamic Range  
n D/A Dynamic Range  
95dB (typ)  
89dB (typ)  
90dB (typ)  
0.02% (typ)  
n A/D Dynamic Range  
The LM4545 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. In  
addition, the LM4545 provides a stereo headphone amplifier  
with an independent gain control and National’s 3D Sound  
stereo enhancement technology.  
n Headphone THD+N at 50mW into 32Ω  
Features  
n Audio Codec ’97 compliant  
n Stereo 18-Bit Σ∆ A/D’s and D/A’s with 128X  
oversampling  
n Stereo headphone amp with separate gain control  
n National’s 3D Sound circuitry  
n Power management support  
The LM4545 features AC-Link, a synchronous, fixed rate se-  
rial bus for connection to the digital AC ’97 Controller. The  
separation of the analog and digital functions of the AC ’97  
architecture allows for system design flexibility and in-  
creased overall performance.  
n Digital Interface 3V and 5V compliant  
Applications  
n Desktop PC Audio Systems  
n Portable PC Audio Systems  
n Mobile PC Audio Solutions  
Block Diagram  
DS100069-1  
FIGURE 1. LM4545 Block Diagram  
© 1999 National Semiconductor Corporation  
DS100069  
www.national.com  

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