BA3313L

Audio ICs Dual preamplifier with ALC detector circuit BA3313L The BA3313L is a dual preamplifier IC with built-in ALC detector circuit, designed for use in stereo radio cassette recorders. It comes in a compact 12-pin ZIP package, and has two record / playback preamplifiers, and an ALC detector circuit. The preamplifiers can be directly coupled to the tape head without coupling capacitors to prevent tape head magnetization and “pop” noise generation. With the built-in ALC detector circuit, an ALC circuit with large dynamic range can be constructed with addition of just an external time constant circuit. FApplications Stereo radio cassette recorders FFeatures 1) Input bias circuit does not require coupling capacitors. 2) Built-in ALC circuit with external time constant circuit. FBlock diagram 3) Wide operating power supply voltage range. 4) High gain. 5) Low noise. 217 Audio ICs FAbsolute maximum ratings (Ta = 25_C) BA3313L FRecommended operating conditions (Ta = 25_C) FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 8V and f= 1kHz) 218 Audio ICs FMeasurement circuit BA3313L 219 Audio ICs FApplication example BA3313L FOperation notes (the resistor marked with an asterisk) Changing the input resistor Rg, and the ALC time constant influences the ALC transient characteristics. In particular, if Rg is less than 3.9kΩ or the time constant capacitor is less than 47µF, the ALC may operate excessively. Do not use smaller values than those recommended...