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Pre-amplifiers with built-in ALC

The BA3308F / FV ICs were developed for stereo radio cassette and tape recorders. Two preamps for recording / playback and an ALC circuit are built into a compact SOP14 / SSOP-B14 package. High performance operation is ensured due to the direct coupling method and built-in ALC detection circuit.

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Specificaion Part No. Package Function
Built-in Detection Diode and Antipop Circuit
BA3308F

SOP14
Built-in Detection Diode and Antipop Circuit
BA3308FV

SSOP-B14

Application block diagram

  
 

Features

Direct coupling method eliminates the need for an input coupling capacitor
The BA3308F / FV input circuit utilizes the direct coupling method that operates using GND as the reference, eliminating the need for an input coupling capacitor (previously required between the microphone or tape head connected to the input). In addition, the DC potential of the input terminal in conventional circuits would change when the power supply was turned ON or OFF, giving rise to the possibility of popping noise generation or DC magnetization of the microphone or tape head. However, with the direct coupling method, the DC potential of the input terminal is fixed at 0V, regardless of whether the power supply is ON or OFF, eliminating potential problems.
Built-in ALC detection diode significantly reduces the number of external parts required
Integrated power supply muting circuit minimizes popping noise during power ON
Low circuit current ideal for portable applications
75dB channel separation


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Pre-amplifiers with built-in ALC

Part No. Supply voltage
(V)		 Open loop gain
(dB)		 THD(%) Input register
(kΩ)		 Max. output voltage
(Vrms)		 Equivalent Input noise voltage
(µVrms)		 ALC
range
(dB)		 Channel balance
(dB)		 Channel separation
(dB)		 Package RoHS
BA3308F 4.5 to 14 80 0.1 25 1.2 1.0 45 0 75 SOP14 Yes
BA3308FV 4.5 to 14 80 0.1 25 1.2 1.0 45 0 75 SSOP-B14 Yes