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LM1971 bảng dữ liệu(PDF) 1 Page - National Semiconductor (TI)

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LM1971
OvertureAudio 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
Overtureis a trademark of National Semiconductor Corporation.
DS012353-1
FIGURE 1. Typical Audio Attenuator Application Circuit
May 1999
© 1999 National Semiconductor Corporation
DS012353
www.national.com


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