LMC1982

Contents

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-2V) and has a maximum gain of -0.5 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's SELECT OUT/SELECT IN external processor loop.

• Low noise and distortion
• Two pairs of stereo inputs
• 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® and Dolby® 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

• Stereo television
• Music reproduction systems
• Sound reinforcement systems
• Electronic music (MIDI)
• Personal computer audio control