CXA1878Q

CXA1878Q Dolby∗ B-C Type Noise Reduction System with Recording/Playback Equalizer Amplifier Description The CXA1878Q is a bipolar IC with a built-in Dolby B-C type noise reduction system (NR), Dolby S type select switch, recording/playback equalizer, electronic volume, and bias control circuit. Use of this IC in combination with two CXA1417S/Q completes a Dolby B-C-S type NR stereo system. Features Dolby B-C type NR Built-in filter required for recording/playback equalizer amplifiers Recording mute function (requiring only an external time constant circuit to implement soft mute) Fade in/out DC controllable NORM/CrO2/METAL tape mode switching function NORM/HIGH tape speed switching function DC controllable for recording level calibration (approximately ±6dB variable) DC controllable for high frequency equalizer amplifier gain (approximately ±4dB variable) Playback deck A/B select switch Recording volume control Bias control circuit Meter circuit Applications Recording/playback equalizer amplifier for stereo analog cassette decks (Applicable to ALPS ELECTRIC CO., LTD. HADKH55 series heads) 64 pin QFP (Plastic) Structure Bipolar silicon monolithic IC Absolute Maximum Ratings Supply voltage VCC 17 V Operating temperature Topr –20 to +75 °C Storage temperature Tstg –65 to +150 °C Allowable power dissipation PD 1020 mW Operating Conditions Supply voltage (VCC VEE) ±6.5 to 8.0 V ∗ These ICs are available only to the licensees of Dolby Laborator...