BD3841FS-E2

Overview

The BD3841FS-E2 is a stereo audio processor manufactured by ROHM Semiconductor, designed for multi-channel sound processing applications. It operates within a supply voltage range of 10 V to 14.6 V (±5 V to ±7.3 V) and features a typical quiescent current of 6 mA. The device provides nine input channels and supports two-interface control via a 2-wire serial bus compatible with both 3.3 V and 5 V logic levels. Key electrical specifications include an output noise of 0.004% THD+N and a typical output voltage of 4.2 V. It is housed in an SSOP-A32 package measuring 13.6 x 7.8 mm with a thickness of 2.01 mm, operating reliably between -20°C and +75°C.

Feature Summary

• Supports simultaneous control of multiple volume LSIs including BD3813KS, BD3815KS, BD3816K1, and BD3817KS through a single serial control bus.
• Enables expansion to 14 input channels when combined with the BD3843FS chip.
• Features excellent cross-talk characteristics achieved through original pattern layout design.
• Integrates a built-in buffer amplifier and supports operation with both single and dual power supplies.

Applications

• Two-room entertainment systems
• Two-source recording setups
• Multi-zone audio distribution networks

Procurement Notes

Verify the specific ordering suffix, as the base model BD3841FS may have variations such as the -E2 designation which indicates RoHS compliance. Confirm the supply status, as some sources indicate this component may be approaching end-of-life or obsolescence phases. Ensure compatibility with existing serial bus protocols before procurement, given the specific voltage requirements for the 2-wire interface.

Selection Notes

Select this component for designs requiring high channel count flexibility without excessive pin counts. It is suitable for systems needing precise cross-talk isolation and low power consumption during standby. Consider the dual-power supply capability if negative rail generation is available. Verify that the host microcontroller can support the required 2-wire serial communication protocol at the specified voltage levels.

Part Context

This part belongs to ROHM's series of audio processors designed for home theater and multi-zone audio applications. It complements other volume LSIs like the BD3813KS and BD3843FS to create scalable audio routing solutions. The family focuses on minimizing external components while providing robust signal processing capabilities for consumer electronics.

Replacement Considerations

Check for direct substitutes within the BD38xx series. The BD3843FS is noted as a complementary chip rather than a direct replacement. Verify if newer revisions or alternative packages from ROHM are available if the SSOP-A32 form factor is no longer accessible.

FAQ

Can the BD3841FS-E2 operate with a single power supply?

Yes, the datasheet specifies that it can be operated by single and dual power sources, with a maximum supply voltage of 14.6 V.

What is the maximum number of input channels supported by this IC alone?

The BD3841FS-E2 itself supports 9 input channels. However, it can be combined with the BD3843FS to achieve up to 14 input channels.

Does the BD3841FS-E2 support digital volume control?

It functions as a sound processor controlled by a 2-wire serial bus, allowing for remote control of audio parameters, though specific volume step details are often shared with companion volume LSIs like the BD3813KS.