LMC1992 Datasheet | National Semiconductor

Description The LMC1992 is a monolithic integrated circuit that provides four stereo inputs bass and treble tone controls and volume balance and front-rear fader controls These functions are digitally controlled through a three-wire munication interface All of the LMC1992s functions are achieved with only three external capacitors per channel It is designed for line level input signals (300 m V b 2V) and has a maximum gain of 0 d B The internal design is optimized for external capacitors having values of 0 1 m F or less This allows the use of chip capacitors for coupling and tone control functions Low noise and distortion result from using analog switches and thin-film silicon-chromium resistor networks in the signal path Volume and fader are at minimum and tone controls are flat when supply voltage is first applied Additional tone control can be achieved using the LMC835 stereo 7-band graphic equalizer connected to the LMC1992’s select-out select-in external processor loop Features Y Y Y Y Y Y Y Y Y Low noise and distortion Four stereo inputs 40 volume levels including mute 20 fader levels All attenuators have a 2 d B of attenuation per step Front back fade control External processor loop Only three external ponents per channel Serial programmable standard MICROWIRETM interface Single supply operation 6V to 12V supply voltage Protection address (similar to DS8906) DC-coupled inputs Single supply operation Applications Automotive audio systems Sound reinforcement systems Home entertainment stereo television and music reproduction systems Electronic music (MIDI) Block and Connection Diagrams TL H 10789 - 2 Order Number LMC1992CCN See NS Package Number N28B TL H 10789 - 1 Left channel shown Pin numbers in parentheses are for the right channel DNR is a registered trademark of National Semiconductor Corporation COPSTM and MICROWIRETM are trademarks of National Semiconductor Corporation C1995 National Semiconductor Corporation TL H 10789...