Digitally Controlled 62dB Audio Attenuator
LM1971
www.ti.com
SNAS104B – FEBRUARY 1995 – REVISED APRIL 2013
LM1971 Overture™ Audio Attenuator Series Digitally Co...
Description
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
FEATURES
1
23 3-Wire Serial Interface Mute Function Click and Pop Free Attenuation Changes 8-Pin Plastic PDIP and SOIC Packages
Available
APPLICATIONS
Communication Systems Cellular Phones and Pagers Personal Computer Audio Control Electronic Music (MIDI) Sound Reinforcement Systems Audio Mixing Automation
KEY SPECIFICATIONS
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)
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 Distortion (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 PDIP or SOIC 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 ...
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