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LM1971M Datasheet

  • LM1971M

  • National Semiconductor [LM1971 Overture⑩ Audio Attenuator ...

  • 251.40KB

  • NSC

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LM1971
Overture
Audio Attenuator Series Digitally Controlled 62 dB Audio Attenuator with Mute
May 1999
LM1971Overture
鈩?/div>
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 鈭?2 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
n
n
n
n
Total harmonic distortion
0.0008%
>
200 kHz (鈭? dB)
Frequency response
Attenuation range (excluding mute)
62 dB
Dynamic range
115 dB
Mute attenuation
102 dB
(typ)
(typ)
(typ)
(typ)
(typ)
Features
n
n
n
n
3-wire serial interface
Mute function
Click and pop free attenuation changes
8-pin plastic DIP and SO packages available
Applications
n
n
n
n
n
n
Communication systems
Cellular Phones and Pagers
Personal computer audio control
Electronic music (MIDI)
Sound reinforcement systems
Audio mixing automation
Typical Application
DS012353-1
FIGURE 1. Typical Audio Attenuator Application Circuit
Overture
鈩?/div>
is a trademark of National Semiconductor Corporation.
漏 1999 National Semiconductor Corporation
DS012353
www.national.com

LM1971M PDF文件相關(guān)型號(hào)

LM1971N

LM1971M 產(chǎn)品屬性

  • National Semiconductor (TI)

  • Tube

  • 95

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