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PDF LM1971M Data sheet ( Hoja de datos )
| Número de pieza | LM1971M | |
| Descripción | LM1971 Overture Audio Attenuator Series Digitally Controlled 62 dB Audio Attenuator with/Mute | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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May 1999
LM1971Overture™ Audio Attenuator Series
Digitally Controlled 62 dB Audio Attenuator with/Mute
General Description
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.
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
0.0008% (typ)
n Frequency response
> 200 kHz (−3 dB) (typ)
n Attenuation range (excluding mute)
62 dB (typ)
n Dynamic range
115 dB (typ)
n Mute attenuation
102 dB (typ)
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
Typical Application
DS012353-1
FIGURE 1. Typical Audio Attenuator Application Circuit
Overture™ is a trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS012353
www.national.com
1 page  
Typical Performance Characteristics (Continued)
THD + N vs Amplitude
THD + N vs Amplitude
Mute Attenuation
vs Frequency
DS012353-16
THD vs Freq by FFT
DS012353-17
THD vs Freq by FFT
DS012353-18
Output Impedance vs
Attenuation Level
DS012353-19
DS012353-20
DS012353-21
5 www.national.com
5 Page 
Notes
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
National Semiconductor
Corporation
Americas
Tel: 1-800-272-9959
Fax: 1-800-737-7018
Email: [email protected]
www.national.com
National Semiconductor
Europe
Fax: +49 (0) 1 80-530 85 86
Email: [email protected]
Deutsch Tel: +49 (0) 1 80-530 85 85
English Tel: +49 (0) 1 80-532 78 32
Français Tel: +49 (0) 1 80-532 93 58
Italiano Tel: +49 (0) 1 80-534 16 80
National Semiconductor
Asia Pacific Customer
Response Group
Tel: 65-2544466
Fax: 65-2504466
Email: [email protected]
National Semiconductor
Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LM1971M.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LM1971 | LM1971 Overture Audio Attenuator Series Digitally Controlled 62 dB Audio Attenuator with/Mute | National Semiconductor |
| LM1971 | LM1971 Overture Audio Atten Series Dig Controlled 62 dB Audio Attenuator w/Mute (Rev. B) |  Texas Instruments |
| LM1971M | LM1971 Overture Audio Attenuator Series Digitally Controlled 62 dB Audio Attenuator with/Mute | National Semiconductor |
| LM1971N | LM1971 Overture Audio Attenuator Series Digitally Controlled 62 dB Audio Attenuator with/Mute | National Semiconductor |
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