BU7858KN-E2

ADCs/DACs - Special Purpose Overview

The BU7858KN-E2 is an audio accessory LSI designed for mobile devices, integrating a stereo 16-bit D/A converter and a headphone amplifier. It supports stereo analogue interfaces and includes a low-band corrective circuit within the headphone amplifier stage. The device features flexible mixing functions and adjustable gain volume control. It operates on a single power supply voltage ranging from 2.7V to 3.3V. Key electrical parameters include a typical current consumption of 2.3 mA with a 16 Ω driver and no signal, a DAC signal-to-noise ratio of 92 dB (A-weighted), and a maximum headphone output power of 10 mW into a 16 Ω load at 1 kHz with 10% THD.

ADCs/DACs - Special Purpose Feature Summary

• Integrated stereo 16-bit audio D/A converter
• Built-in stereo headphone amplifier capable of driving 16 Ω loads
• Low-band corrective circuit in the headphone amplifier output path
• Flexible audio mixing function with adjustable gain volume

ADCs/DACs - Special Purpose Applications

• Cellular phones with music playback capabilities
• Portable information and communication equipment
• Personal Digital Assistants (PDA)

ADCs/DACs - Special Purpose Procurement Notes

Verify component authenticity through official ROHM Semiconductor channels or authorized distributors. Confirm the specific suffix '-E2' matches project requirements, as it denotes environmental compliance status. Check for moisture sensitivity handling instructions during storage and assembly, as indicated by the humidity sensitivity classification in standard datasheets.

ADCs/DACs - Special Purpose Selection Notes

Select this component when a compact solution combining digital-to-analog conversion and analog amplification is required for portable audio applications. Ensure the design accommodates the VQFN-EP-28 package dimensions. Verify that the system clock inputs (MCLKI, BCLK, LRCLK) align with the supported frequency ranges and interface formats specified in the digital interface section.

ADCs/DACs - Special Purpose Part Context

The BU7858KN belongs to the BU7858KN series of Audio Accessory ICs for Mobile Devices manufactured by ROHM Semiconductor. It is part of a lineup that includes variants like the BU7893GU, which adds 3D surround enhancement and equalizer functions. This specific model focuses on core D/A conversion and headphone amplification without the additional spatial audio processing found in higher-tier models.

ADCs/DACs - Special Purpose Replacement Considerations

The BU7893GU is a related variant within the same family but includes additional features such as 3D surround enhancement and a 3-band equalizer. If these extra functions are not required, the BU7858KN may be suitable. However, direct pin-for-pin replacement requires verifying functional compatibility, as the BU7893GU has a different package (VCSP85H3) and distinct pinout configuration.