BH3857

Audio ICs Audio sound controller BH3857AFV The BH3857AFV is a signal-processing IC for controlling audio quality in CD radio-cassette players and mini-component stereo systems. Three-line serial control is available making it easy to adjust tone and volume using a microprocessor. FApplications Mini-component stereo systems, CD radio cassette players, car audio systems and TVs. FFeatures 1) Volume (main volume) and tone (bass and treble) control possible by direct serial link to a microprocessor. DC control is also possible. 2) Volume control is done with a low-distortion, lownoise VCA, and step noise is suppressed. 3) The gain of the input amplifier can be adjusted, and two surround matrixes are available to expand the sound. 4) The IC includes a stable reference voltage source and input buffer to reduce external component requirements, and comes in a compact 40-pin SSOP package that is perfect for compact designs. 5) Four open-collector outputs are provided to make logic control possible. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 664 Audio ICs FBlock diagram BH3857AFV Control of volume, bass, treble and surround 2 can also be done by external application of a DC voltage to the VC (volume), BC (bass), TC (treble) and SC (surround 2) terminals. The impedance of the VC, TC, and BC terminals is 10kΩ (Typ.). The impedance of the SC terminal is 200kΩ (Typ.). 665 Audio ICs FPin descriptions BH3857AFV 666 Audio ICs BH3857AFV ...