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LMC1982 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LMC1982 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 14 page  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–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. Features n Low noise and distortion n Two pairs of stereo inputs n Enhanced stereo function 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 and Connection Diagrams DNR® is a registered trademark of National Semiconductor Corporation. Dolby® is a registered trademark of Dolby Labs. DS011028-1 December 1994 © 1999 National Semiconductor Corporation DS011028 www.national.com |
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