This part is a kind of semiconductor called BD3805F.
Function of this product has Sound Processor for Car Audio.
Manufacturers : Rohm
Image and pinout :
Some of the text within the PDF file :
BD3805F Audio ICS Sound processor for car audio BD3805F The BD3805F is a sound processor developed for car audio. High S/N and low distortion rate of parametric equalizer can be composed without an external capacitor. Pop noise when switching volume, fader, mute and tone gain can’t be heard due to the integrated soft switching circuit. zApplications Car audio, Mini component stereo, Micro component stereo, DVD, TV zFeatures zExternal dimensions (Unit : mm) 1) Noise when switching, attenuation of fader and fader, and gain (middle bass and treble) can be reduced by soft switching circuit.. 13.6±0.2 2) Perfect due low current consumption (Typ.12mA) and energy saving 22 12 design due to Bi-CMOS process. 3) Available for Rear Entertainment System due to I2C BUS contro [ ... ]