BA3402

Audio ICs Dual-channel, auto-reverse tape preamplifier BA3402 The BA3402 is a dual preamplifier developed for auto-reverse car tape decks. An electronic switch on the chip switches between the forward and reverse heads, and this has the benefits of greater reliability, easier wiring, lower space requirements, and improved assembly efficiency when compared with conventional mechanical switches. The circuit is designed in such a way that coupling capacitors are not required. In addition to reducing the number of external components required, this ensures that the head is not magnetized when the power is applied. FApplications Car stereos and play-only auto-reverse cassette decks. FFeatures 1) Low noise (VNIN = 1.2µVrms). 2) High open loop gain (GVO = 85dB). 3) Reliable electronic switch on the chip. Head switching for both left and right channels is possible with the addition of one external switch circuit. 4) Input-side virtual-ground design means that input coupling capacitors are not required. FBlock diagram 5) Built-in bias circuit reduces attached component requirements. 6) Low “pop” noise during head switching. 7) Emitter-follower output circuit with large drive capacity. 8) Pin layout allows easy PCB design. 9) Compact package allows high PCB wiring density. 226 www.DataSheet4U.com - Free DataSheet Site. Audio ICs FInternal circuit configuration BA3402 FAbsolute maximum ratings (Ta = 25_C) FElectrical characteristics (unless otherwise noted, Ta = 25_C and VCC = ...