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LMC1983CIN Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LMC1983CIN Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 14 page 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–2V) and has a maximum gain of −0.5 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’s SELECT OUT/SELECT IN external processor loop. Features n Low noise and distortion n Three pairs of stereo inputs n Loudness compensation n 40 position 2 dB/step volume attenuator plus mute n Independent left and right volume controls n Low noise-suitable for use with DNR® and Dolby® noise reduction n External processor loop n Signal handling suitable for compact discs n Pop-free switching n Serially programmable: INTERMETAL bus (IM) interface n 6V to 12V single supply operation n 28 Pin DIP or PLCC Package Applications n Stereo television n Music reproduction systems n Sound reinforcement systems n Electronic music (MIDI) n Personal computer audio control Block Diagram DNR® is a registered trademark of National Semiconductor Corporation. Dolby® is a registered trademark of Dolby Labs. DS011279-1 August 1992 © 1999 National Semiconductor Corporation DS011279 www.national.com |
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