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LMC1982CIV Datasheet

  • LMC1982CIV

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

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LMC1982 Digitally-Controlled Stereo Tone and Volume Circuit with Two Selectable Stereo Inputs
December 1994
LMC1982
Digitally-Controlled Stereo Tone and Volume Circuit with
Two Selectable Stereo Inputs
General Description
The LMC1982 is a monolithic integrated circuit that provides
volume, balance, tone (bass and treble), enhanced stereo,
and loudness controls and selection between two pairs of
stereo inputs. These functions are digitally controlled
through a three-wire communication interface. There are two
digital inputs for easy interface to other audio peripherals
such as stereo decoders. The LMC1982 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 voltage 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
LMC1982鈥檚 SELECT OUT/SELECT IN external processor
loop.
n
n
n
n
n
n
n
n
n
n
n
Enhanced stereo function
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
n
Two pairs of stereo inputs
Block and Connection Diagrams
DS011028-1
DNR
廬
is a registered trademark of National Semiconductor Corporation.
Dolby
廬
is a registered trademark of Dolby Labs.
漏 1999 National Semiconductor Corporation
DS011028
www.national.com

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