LMC1983 Datasheet | National Semiconductor

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 munication 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 m V- 2V) and has a maximum gain of - 0.5 d B. 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. n n n n n n n n n n n Three pairs of stereo inputs Loudness pensation 40 position 2 d B/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 pact 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 n n n Stereo television Music reproduction systems Sound reinforcement systems Electronic music (MIDI) Personal puter audio control Features n Low noise and distortion Block Diagram DS011279-1 DNR ® is a registered trademark of National Semiconductor Corporation. Dolby ® is a registered trademark of Dolby Labs. © 1999 National Semiconductor Corporation DS011279 .national. Absolute Maximum Ratings 2) (Notes 1, If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (V+ - GND) Voltage at any Pin Input Current at any Pin (Note 3) Package Input Current (Note 3) Power Dissipation (Note 4)...