BA3430S

Audio ICs Stereo pre-amplifiers with mute detection circuits for car stereos BA3430S / BA3430F / BA3430FS The BA3430S, BA3430F, and BA3430FS are stereo pre-amplifiers with mute detection circuits which have been designed for use in car stereos. The analog circuitry including the pre-amplifier and mute detection and the digital circuitry such as control logic circuits have been combined together on a single chip. This has made it possible to reduce the interface with the microcontroller to five parallel inputs and outputs, and enables a very compact circuit configuration around the tape head. The BA3430S, BA3430F, or BA3430FS makes it possible to easily incorporate an ultra-compact, high-precision pre-amplifier board into the mechanical components of a car stereo. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 269 Audio ICs FBlock diagram BA3430S / BA3430F / BA3430FS 270 Audio ICs FPin descriptions BA3430S / BA3430F / BA3430FS 271 Audio ICs BA3430S / BA3430F / BA3430FS FElectrical characteristics (unless otherwise noted, Ta = 25_C and VCC = 9V, f = 1kHz, Rg = 680Ω, VO = *10dBV) 272 Audio ICs FMeasurement circuit BA3430S / BA3430F / BA3430FS FAudio signal amplification circuit (1) Input switch circuit This circuit switches between head A and head B as needed for the auto reverse function. A 10kΩ or less resistor must be connected to the input pin to limit the input current. Equivalent circuit schematic The electrolytic capac...