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LM1971

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	251K
描述
LM1971 Overture⑩ Audio Attenuator Series Digitally Controlled 62 dB Audio Attenuator with/Mute

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LM1971 数据手册

May 1999

vOutre

™

LM1971Overture Audio Attenuator Series

Digitally Controlled 62 dB Audio Attenuator with/Mute

General Description

Key Specifications

n Total harmonic distortion

n Frequency response

n Attenuation range (excluding mute)

n Dynamic range

0.0008% (typ)

200 kHz (−3 dB) (typ)

62 dB (typ)

The LM1971 is a digitally controlled single channel audio at-

tenuator fabricated on a CMOS process. Attenuation is vari-

able in 1 dB steps from 0 dB to −62 dB. A mute function dis-

connects the input from the output, providing over 100 dB of

attenuation.

115 dB (typ)

102 dB (typ)

n Mute attenuation

The performance of the device is exhibited by its ability to

change attenuation levels without audible clicks or pops. In

addition, the LM1971 features a low Total Harmonic Distor-

tion (THD) of 0.0008%, and a Dynamic Range of 115 dB,

making it suitable for digital audio needs. The LM1971 is

available in both 8-pin plastic DIP or SO packages.

Features

n 3-wire serial interface

n Mute function

n Click and pop free attenuation changes

n 8-pin plastic DIP and SO packages available

The LM1971 is controlled by a TTL/CMOS compatible 3-wire

serial digital interface. The active low LOAD line enables the

data input registers while the CLOCK line provides system

timing. Its DATA pin receives serial data on the rising edge of

each CLOCK pulse, allowing the desired attenuation setting

to be selected.

Applications

n Communication systems

n Cellular Phones and Pagers

n Personal computer audio control

n Electronic music (MIDI)

n Sound reinforcement systems

n Audio mixing automation

Typical Application

DS012353-1

FIGURE 1. Typical Audio Attenuator Application Circuit

™

Overture is a trademark of National Semiconductor Corporation.

DS012353

www.national.com

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LM1971M	NSC	获取价格	LM1971 Overture⑩ Audio Attenuator Series Digi
LM1971M	TI	获取价格	LM1971 Overture Audio Attenuator Series Digitally Controlled 62 dB Audio Attenuator
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LM1971MWC	TI	获取价格	SPECIALTY CONSUMER CIRCUIT, UUC, WAFER
LM1971MX	TI	获取价格	LM1971 Overture Audio Attenuator Series Digitally Controlled 62 dB Audio Attenuator
LM1971MX/NOPB	NSC	获取价格	IC SPECIALTY CONSUMER CIRCUIT, PDSO8, 0.150 INCH, PLASTIC, SOP-8, Consumer IC:Other
LM1971MX/NOPB	TI	获取价格	Overture Audio Attenuator Series Digitally Controlled 62 dB Audio Attenuator
LM1971N	NSC	获取价格	LM1971 Overture⑩ Audio Attenuator Series Digi