LM1971M National Semiconductor, LM1971M Datasheet

LM1971M

Manufacturer Part Number

LM1971M

Description

Audio Attenuator

Manufacturer

National Semiconductor

Datasheets

1.LM1971M.pdf (11 pages)

2.LM1971M.pdf (11 pages)

3.LM1971M.pdf (11 pages)

Specifications of LM1971M

Peak Reflow Compatible (260 C)

Ic Function

Audio Attenuator

Termination Type

SMD

Supply Voltage Max

15V

Leaded Process Compatible

No. Of Control Channels

Mounting Type

Surface Mount

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Available stocks

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Part Number

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Quantity

Price

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Bonase Electronics (HK) Co., Limited

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Bonase Electronics (HK) Co., Limited

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Meier Automation Equipment Co., Limited

Part Number:

LM1971MX

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Company:

Bonase Electronics (HK) Co., Limited

Part Number:

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LM1971Overture

Digitally Controlled 62 dB Audio Attenuator with/Mute

General Description

The LM1971 is a digitally controlled single channel audio

attenuator fabricated on a CMOS process. Attenuation is

variable in 1 dB steps from 0 dB to −62 dB. A mute function

disconnects the input from the output, providing over 100 dB

of 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.

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.

Key Specifications

n Total harmonic distortion

n Frequency response

Typical Application

Overture

™

is a trademark of National Semiconductor Corporation.

FIGURE 1. Typical Audio Attenuator Application Circuit

™

200 kHz (−3 dB) (typ)

DS012353

Audio Attenuator Series

0.0008% (typ)

n Attenuation range (excluding mute)

n Dynamic range

n Mute attenuation

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

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

01235301

September 2002

www.national.com

102 dB (typ)

115 dB (typ)

62 dB (typ)

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