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LM1972M PDF预览

LM1972M

更新时间: 2024-11-22 22:51:55
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 304K
描述
Pot 2-Channel 78dB Audio Attenuator with Mute

LM1972M 技术参数

是否Rohs认证: 不符合生命周期:Transferred
包装说明:SOP, SOP20,.4Reach Compliance Code:not_compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:3.56商用集成电路类型:CONSUMER CIRCUIT
JESD-30 代码:R-PDSO-G20JESD-609代码:e0
长度:12.8 mm湿度敏感等级:2A
功能数量: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:SOP
封装等效代码:SOP20,.4封装形状:RECTANGULAR
封装形式:SMALL OUTLINE峰值回流温度(摄氏度):220
电源:+-6 V认证状态:Not Qualified
座面最大高度:2.642 mm子类别:Audio Control ICs
最大压摆率:4 mA最大供电电压 (Vsup):12 V
最小供电电压 (Vsup):4.5 V表面贴装:YES
技术:CMOS温度等级:COMMERCIAL
端子面层:Tin/Lead (Sn/Pb)端子形式:GULL WING
端子节距:1.27 mm端子位置:DUAL
处于峰值回流温度下的最长时间:30宽度:7.49 mm
Base Number Matches:1

LM1972M 数据手册

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April 1995  
LM1972  
µPot 2-Channel 78dB Audio Attenuator with Mute  
n Frequency response:  
n Attenuation range (excluding mute):  
n Differential attenuation:  
n Signal-to-noise ratio (ref. 4 Vrms):  
n Channel separation:  
100 kHz (−3dB) (min)  
78dB (typ)  
General Description  
The LM1972 is a digitally controlled 2-channel 78dB audio  
attenuator fabricated on a CMOS process. Each channel  
has attenuation steps of 0.5dB from 0dB–47.5dB, 1.0dB  
steps from 48dB–78dB, with a mute function attenuating  
104dB. Its logarithmic attenuation curve can be customized  
through software to fit the desired application.  
±
0.25dB (max)  
110dB (min)  
100dB (min)  
Features  
The performance of a µPot is demonstrated through its ex-  
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  
Applications  
The LM1972’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  
LM1972 allows multiple µPots to be daisy-chained together,  
reducing the number of enable and data lines to be routed  
for a given application.  
n Automated studio mixing consoles  
n Music reproduction systems  
n Sound reinforcement systems  
n Electronic music (MIDI)  
n Personal computer audio control  
Key Specifications  
n Total Harmonic Distortion + Noise:  
0.003% (max)  
Typical Application  
Connection Diagram  
Dual-In-Line Plastic or  
Surface Mount Package  
DS011978-1  
FIGURE 1. Typical Audio Attenuator Application Circuit  
DS011978-2  
Top View  
Order Number LM1972M or LM1972N  
See NS Package Number M20B or N20A  
µPot and Overture are trademarks of National Semiconductor Corporation.  
© 1999 National Semiconductor Corporation  
DS011978  
www.national.com  

LM1972M 替代型号

型号 品牌 替代类型 描述 数据表
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