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LM1971MX 데이터시트(PDF) 1 Page - Texas Instruments

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부품명 LM1971MX
상세설명  Overture Audio Attenuator Series Digitally Controlled 62 dB Audio Attenuator
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LM1971
www.ti.com
SNAS104B – FEBRUARY 1995 – REVISED APRIL 2013
LM1971 Overture™ Audio Attenuator Series Digitally Controlled 62 dB Audio Attenuator
with/Mute
Check for Samples: LM1971
1
FEATURES
DESCRIPTION
The LM1971 is a digitally controlled single channel
23
3-Wire Serial Interface
audio attenuator fabricated on a CMOS process.
Mute Function
Attenuation is variable in 1 dB steps from 0 dB to
−62
Click and Pop Free Attenuation Changes
dB. A mute function disconnects the input from the
output, providing over 100 dB of attenuation.
8-Pin Plastic PDIP and SOIC Packages
Available
The performance of the device is exhibited by its
ability to change attenuation levels without audible
APPLICATIONS
clicks or pops. In addition, the LM1971 features a low
Total Harmonic Distortion (THD) of 0.0008%, and a
Communication Systems
Dynamic Range of 115 dB, making it suitable for
Cellular Phones and Pagers
digital audio needs. The LM1971 is available in both
Personal Computer Audio Control
8-pin plastic PDIP or SOIC packages.
Electronic Music (MIDI)
The LM1971 is controlled by a TTL/CMOS compatible
3-wire serial digital interface. The active low LOAD
Sound Reinforcement Systems
line enables the data input registers while the CLOCK
Audio Mixing Automation
line provides system timing. Its DATA pin receives
serial data on the rising edge of each CLOCK pulse,
KEY SPECIFICATIONS
allowing
the
desired
attenuation
setting
to
be
selected.
Total Harmonic Distortion 0.0008 % (Typ)
Frequency Response > 200 kHz (
−3 dB) (Typ)
Attenuation Range (Excluding Mute) 62 dB
(Typ)
Dynamic Range 115 dB (Typ)
Mute Attenuation 102 dB (Typ)
Typical Application
Figure 1. Typical Audio Attenuator Application Circuit
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
Overture is a trademark of dcl_owner.
3
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 1995–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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