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LMC1983CIV Datasheet

  • LMC1983CIV

  • Digitally-Controlled Stereo Tone and Volume Circuit with Thr...

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LMC1983 Digitally-Controlled Stereo Tone and Volume Circuit with Three Selectable Stereo
Inputs
August 1992
LMC1983
Digitally-Controlled Stereo Tone and Volume Circuit with
Three Selectable Stereo Inputs
General Description
The LMC1983 is a monolithic integrated circuit that provides
volume, balance, tone (bass and treble), loudness controls
and selection between three pairs of stereo inputs. These
functions are digitally controlled through a three-wire com-
munication interface. There are two digital inputs for easy in-
terface to other audio peripherals such as stereo decoders.
The LMC1983 is designed for line level input signals
(300 mV鈥?V) and has a maximum gain of 鈭?.5 dB. Volume
is set at minimum and tone controls are flat when supply volt-
age is first applied.
Low noise and distortion result from using analog switches
and poly-silicon resistor networks in the signal path.
Additional tone control can be achieved using the LMC835
stereo 7-band graphic equalizer connected to the
LMC1983鈥檚 SELECT OUT/SELECT IN external processor
loop.
n
n
n
n
n
n
n
n
n
n
n
Three pairs of stereo inputs
Loudness compensation
40 position 2 dB/step volume attenuator plus mute
Independent left and right volume controls
Low noise-suitable for use with DNR
廬
and Dolby
廬
noise
reduction
External processor loop
Signal handling suitable for compact discs
Pop-free switching
Serially programmable: INTERMETAL bus (IM) interface
6V to 12V single supply operation
28 Pin DIP or PLCC Package
Applications
n
n
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Stereo television
Music reproduction systems
Sound reinforcement systems
Electronic music (MIDI)
Personal computer audio control
Features
n
Low noise and distortion
Block Diagram
DS011279-1
DNR
廬
is a registered trademark of National Semiconductor Corporation.
Dolby
廬
is a registered trademark of Dolby Labs.
漏 1999 National Semiconductor Corporation
DS011279
www.national.com

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