Design solutions that pursue the sound quality and experience you need
A compact digital mixer must simultaneously accept microphones, instruments, line sources, and USB audio. The MVSILICON BP2668Dx integrates four 32-bit ADCs, each with SNR ≥105 dB, enabling independent analog-front-end processing for every channel. Liwei Electronics routes each ADC through dedicated mic preamps or line buffers to maintain channel isolation and low noise. With four ADCs on-chip, a 4-channel small mixer no longer needs an external ADC chip, reducing the BOM and layout complexity.
The heart of any mixer is the ability to blend multiple inputs and route the result to several outputs. The BP2668Dx provides four DACs with SNR ≥112 dB, enough to drive main speakers, monitor speakers, headphones, and a USB return path at the same time. Liwei’s PCBA design sends the DAC outputs through differential line drivers to power amplifiers or headphone amps. The high dynamic range reduces the amount of analog gain needed downstream, which in turn lowers the system noise floor.
A physical mixer needs faders, rotary knobs, LED meters, and buttons. The BP2668Dx offers 39 GPIO pins and 30 channels of SAR-ADC, so the panel can scan potentiometers and touch keys directly without extra expanders. Liwei’s firmware scans the SAR-ADC in time slices, maps fader positions to digital gain coefficients, and updates the mix within a few milliseconds. The result is a responsive, real-time control surface suitable for live use.
The integrated USB 2.0 high-speed OTG port lets the mixer connect to a PC or mobile phone with a single Type-C cable. In device mode it streams multi-track audio for recording; in host mode it can read a USB drive for playback or firmware updates. This flexibility makes the BP2668Dx mixer ideal for live streaming, podcasting, and home studios. Liwei adds ESD protection and matched USB traces to improve interface reliability.
Q: Can the four DACs drive both headphones and power amplifiers at the same time?
A: Yes. Each DAC can be assigned to a separate output path, such as main output, monitor output, headphone output, and USB return. External amplifiers then drive the actual loads.
Q: What is the main role of the 30-channel SAR-ADC in a mixer?
A: It reads analog control signals from faders, knobs, and buttons, converting physical positions into digital gain values and status flags for the mixer firmware.
Q: Does the BP2668Dx need an external DSP for basic mixing?
A: No. The chip has enough internal audio resources for basic mixing, EQ, and dynamics. For advanced effects, an external DSP can be added, and Liwei can customize the design accordingly.
Shenzhen Liwei Electronic Technology Co., Ltd. specializes in audio headset electronic solution design and chip-plus-PCBA turnkey development. With 12 years of experience and more than 300 clients, Liwei offers customized hardware and firmware solutions based on the MVSILICON BP2668Dx. Contact us to request a quote or sample evaluation.
Keywords: MVSILICON BP2668Dx, compact digital mixer, multi-channel mixing, USB OTG mixer, audio SoC solution
