Datasheet > LM1973N

LM1973N

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	309K
描述
レPot⑩3-Channel 76dB Audio Attenuator with Mute

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LM1973N 数据手册

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.

DS011958

www.national.com

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LM1973N 替代型号

型号	品牌	替代类型	描述	数据表
LM1973NNOPB	TI	功能相似	SPECIALTY CONSUMER CIRCUIT, PDIP20, PLASTIC, DIP-20

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