LM1973MNOPB National Semiconductor, LM1973MNOPB Datasheet

LM1973MNOPB

Manufacturer Part Number

LM1973MNOPB

Description

SOP20

Manufacturer

National Semiconductor

Datasheet

1.LM1973MNOPB.pdf (12 pages)

Specifications of LM1973MNOPB

Date_code

09+

Current page: 1 of 12
Download datasheet (353Kb)

LM1973

µPot

General Description

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.

The performance of a µPot

excellent 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 be-

tween any attenuation settings are pop free.

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.

Typical Application

µPot

™

and Overture

™

FIGURE 1. Typical Audio Attenuator

™

3-Channel 76dB Audio Attenuator with Mute

are trademarks of National Semiconductor Corporation.

Application Circuit

™

is demonstrated through its

DS011958

01195801

Key Specifications

n Total Harmonic Distortion + Noise:

n Frequency response:

n Attenuation range (excluding mute):

n Differential attenuation:

n Signal-to-noise ratio (ref. 4 Vrms):

n Channel separation:

Features

n 3-wire serial interface

n Daisy-chain capability

n 104dB mute attenuation

n Pop and click free attenuation changes

Applications

n Automated studio mixing consoles

n Music reproduction systems

n Sound reinforcement systems

n Electronic music (MIDI)

n Personal computer audio control

Connection Diagram

See NS Package Number M20B or N20A

Order Number LM1973M or LM1973N

Surface Mount Package

Dual-In-Line Plastic or

Top View

100 kHz (−3dB) (min)

December 1994

01195802

0.003% (max)

0.25dB (max)

www.national.com

110dB (min)

110dB (typ)

76dB (typ)

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