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LM1972

更新时间： 2023-09-03 20:31:04
品牌 Logo 应用领域
德州仪器 - TI 衰减器
页数 文件大小 规格书
23页 880K
描述
具有静音功能的 μPot 2 通道 78dB 音频衰减器

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LM1972 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：5.61
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：4 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

LM1972 数据手册

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LM1972  
www.ti.com  
SNAS094D –APRIL 1995–REVISED MARCH 2013  
LM1972 μPot 2-Channel 78dB Audio Attenuator with Mute  
Check for Samples: LM1972  
1
FEATURES  
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.  
2
•
•
•
•
3-Wire Serial Interface  
Daisy-Chain Capability  
104dB Mute Attenuation  
Pop and Click Free Attenuation Changes  
APPLICATIONS  
The performance of a μPot is demonstrated through  
its excellent Signal-to-Noise Ratio, extremely low  
(THD+N), and high channel separation. Each μPot  
contains a mute function that disconnects the input  
•
•
•
•
•
Automated Studio Mixing Consoles  
Music Reproduction Systems  
Sound Reinforcement Systems  
Electronic Music (MIDI)  
signal from the output, providing  
a
minimum  
attenuation of 96dB. Transitions between any  
attenuation settings are pop free.  
Personal Computer Audio Control  
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.  
KEY SPECIFICATIONS  
•
Total Harmonic Distortion +  
Noise: 0.003 % (max)  
•
•
Frequency response: 100 kHz (−3dB) (min)  
Attenuation range (excluding  
mute): 78 dB (typ)  
•
•
Differential attenuation: ±0.25 dB (max)  
Signal-to-noise ratio  
(ref. 4 Vrms): 110 dB (min)  
•
Channel separation: 100 dB (min)  
Typical Application  
Connection Diagram  
Figure 1. Typical Audio Attenuator Application  
Circuit  
Figure 2. 20-Lead SOIC - Top View  
See DW Package  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
All trademarks are the property of their respective owners.  
2
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 1995–2013, Texas Instruments Incorporated  
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