BA7780KV

Video ICs Stereo zoom microphone amplifier for camcorders BA7780KV The BA7780KV is a microphone amplifier developed for use in camcorders. The IC features an electronic volume circuit for presetting the curve required for the stereo zoom function, a microphone element power supply regulator, a wind-noise rejection filter, a current limiting circuit for external accessory power supplies, and an input for external microphone input. The IC operates off a 3.3V power supply. Applications Camcorders Features 1) Operates off a 3.0V to 5.25V power supply. 2) Zoom microphone processing function on one chip. 3) Built-in electronic volume for external setting of sensitivity and control voltage. 4) Adjustable microphone element sensitivity. 5) Matrix amplifier for stereo emphasis. 6) Automatic switching circuit for external inputs, and built-in external monaural decision circuit. Absolute maximum ratings (Ta = 25°C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 7.0 750∗ – 10 ~ + 70 – 55 ~ + 125 Unit V mW °C °C ∗ Reduced by 7.5mW for each increase in Ta of 1°C over 25°C. Recommended operating conditions (Ta = 25°C) Parameter Power supply voltage Symbol VCCS Min. 3.0 Typ. — Max. 5.25 Unit V 1 Video ICs BA7780KV Block diagram OUT AMP IN L PRE OUT L MTX OUT L INV OUT L GC OUT L BL OUT L SUB IN L MTX IN L HPF IN L MODE 43 EXT IN L INT IN L VREG L 48 GND L 49 MIX1 IN L 50 13dB 47 46 45...