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LM1973M PDF预览

LM1973M

更新时间: 2024-01-02 22:14:57
品牌 Logo 应用领域
美国国家半导体 - NSC 衰减器
页数 文件大小 规格书
11页 309K
描述
レPot⑩3-Channel 76dB Audio Attenuator with Mute

LM1973M 技术参数

是否Rohs认证: 符合生命周期:Obsolete
包装说明:DIP, DIP20,.3Reach Compliance Code:compliant
HTS代码:8542.39.00.01风险等级:5.59
商用集成电路类型:CONSUMER CIRCUITJESD-30 代码:R-PDIP-T20
JESD-609代码:e3湿度敏感等级:1
端子数量:20最高工作温度:70 °C
最低工作温度:封装主体材料:PLASTIC/EPOXY
封装代码:DIP封装等效代码:DIP20,.3
封装形状:RECTANGULAR封装形式:IN-LINE
电源:+-6 V认证状态:Not Qualified
子类别:Audio Control ICs最大压摆率:5 mA
表面贴装:NO技术:CMOS
温度等级:COMMERCIAL端子面层:Matte Tin (Sn)
端子形式:THROUGH-HOLE端子节距:2.54 mm
端子位置:DUALBase Number Matches:1

LM1973M 数据手册

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December 1994  
LM1973  
µPot 3-Channel 76dB Audio Attenuator with Mute  
General Description  
Key Specifications  
n Total Harmonic Distortion + Noise:  
n Frequency response:  
n Attenuation range (excluding mute):  
n Differential attenuation:  
0.003% (max)  
100 kHz (−3dB) (min)  
76dB (typ)  
The LM1973 is a digitally controlled 3-channel 76dB audio  
attenuator fabricated on a CMOS process. Each channel  
has attenuation steps of 0.5dB from 0dB–15.5dB, 1.0dB  
steps from 16dB–47dB, and 2.0dB steps from 48dB– 76dB,  
with a mute function attenuating 104dB. Its logarithmic at-  
tenuation curve can be customized through software to fit  
the desired application.  
±
0.25dB (max)  
110dB (min)  
110dB (typ)  
n Signal-to-noise ratio (ref. 4 Vrms):  
n Channel separation:  
The performance of a µPot is demonstrated through its ex-  
Features  
cellent Signal-to-Noise Ratio, extremely low (THD+N), and  
high channel separation. Each µPot contains a mute function  
that disconnects the input signal from the output, providing a  
minimum attenuation of 96dB. Transitions between any at-  
tenuation settings are pop free.  
n 3-wire serial interface  
n Daisy-chain capability  
n 104dB mute attenuation  
n Pop and click free attenuation changes  
The LM1973’s 3-wire serial digital interface is TTL and  
CMOS compatible; receiving data that selects a channel and  
the desired attenuation level. The Data-Out pin of the  
LM1973 allows multiple µPots to be daisy-chained together,  
reducing the number of enable and data lines to be routed  
for a given application.  
Applications  
n Automated studio mixing consoles  
n Music reproduction systems  
n Sound reinforcement systems  
n Electronic music (MIDI)  
n Personal computer audio control  
Typical Application  
Connection Diagram  
Dual-In-Line Plastic or  
Surface Mount Package  
DS011958-1  
FIGURE 1. Typical Audio Attenuator  
Application Circuit  
DS011958-2  
Top View  
Order Number LM1973M or LM1973N  
See NS Package Number M20B or N20A  
µPot and Overture are trademarks of National Semiconductor Corporation.  
© 1999 National Semiconductor Corporation  
DS011958  
www.national.com  

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