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| Audio ICs Dual preamplifier with ALC detector circuit BA3314F The BA3314F is a dual preamplifier IC with built-in ALC detector circuit, designed for audio applications. It comes in a compact 14-pin SOP package, and has two record / playback preamplifiers, and an ALC detector circuit. The preamplifier 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 Audio equipment 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) BA3314F FRecommended operating conditions (Ta = 25_C) FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 8V and f= 1kHz) 218 Audio ICs FMeasurement circuit BA3314F FOperation notes Changing the input resistor Rg, and the ALC time constant influences the ALC transient characteristics. In particular, if Rg is less than 3.9k or the time constant capacitor is less than 47F, the ALC may operate excessively. Do not use smaller values than those recommended for these components. 219 Audio ICs FApplication example BA3314F FElectrical characteristics curve FExternal dimensions (Units: mm) 220 |
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