LMC1983

·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® 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

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 communication interface. There are two digital inputs for easy interface to other audio peripherals such as stereo decoders.

The LMC1983 is designed for line level input signals (300 mV2V) 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 LMC1983's SELECT OUT/SELECT IN external processor loop.