BA3308

Overview

The BA3308 is a dual preamplifier IC with built-in Automatic Level Control (ALC) circuits, designed for stereo radio-cassette recorders and tape recorders. It features two record/playback preamplifiers that can be directly coupled to the tape head without coupling capacitors, preventing magnetization and pop noise. The device operates within a wide power supply voltage range of 4.5V to 14V. Key electrical characteristics include a voltage gain of 80dB, total harmonic distortion of 0.1%, and input noise of 1μVrms. Quiescent current dissipation is specified at 3.5mA.

Feature Summary

• Built-in ALC rectifier diode enabling channel balance and dynamic range adjustment via external components
• Direct-coupled amplifier inputs eliminating the need for input coupling capacitors
• Integrated power-on mute circuit to suppress pop noise during startup
• Wide operating power supply voltage range supporting various system designs

Applications

• Stereo radio cassette recorders
• Cassette decks
• Home stereo systems
• Music centers

Procurement Notes

Verify package availability as the BA3308 comes in 9-pin SIP, while variants like BA3308F and BA3308FV use 14-pin MF or SSOP packages. Confirm RoHS compliance status for specific manufacturing batches. Ensure application circuit components match recommended values for C3, C4, R3, R4, C8, and R8 to guarantee proper operation of the power-on mute function and prevent pop noise generation.

Selection Notes

Select this component when designing audio recording paths requiring integrated automatic level control and high-gain preamplification. The direct-coupled architecture simplifies design by removing input capacitors, reducing cost and potential signal degradation. Consider the 80dB gain and low distortion specifications for high-fidelity applications. Ensure the power supply voltage falls within the 4.5V to 14V range for optimal performance.

Part Context

The BA3308 belongs to Rohm Semiconductor's audio IC portfolio, specifically targeting analog audio processing for consumer electronics. It integrates both preamplification and control functions into a single chip, reducing board space and component count compared to discrete solutions. This integration supports compact designs in portable and home audio equipment where size and reliability are critical factors.

Replacement Considerations

BA3308F: 14-pin MF package variant. BA3308FV: 14-pin SSOP package variant.