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LM1972N

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

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LM1972N 数据手册

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.

DS011978

www.national.com

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