The BP2640Ax earphone solution from Liwei Electronic is built around the Mountain View (MVSILICON) BP2640Ax dual-core wireless audio DSP. It integrates a Bluetooth 6.0 dual-mode radio with BLE Audio (CIS/BIS), a 2.4 GHz private low-latency link, a 3-channel 32-bit audio ADC/DAC and an on-device AI accelerator, providing a future-proof PCBA platform for mid-to-high-end Bluetooth music headsets, TWS, gaming dual-mode and live karaoke products.
Core Highlights
- Bluetooth 6.0 dual mode + BLE Audio, ready for the next protocol generation: the chip integrates a Bluetooth 6.0 (BR/EDR + BLE) dual-mode radio with the complete A2DP / AVRCP / HFP / HSP / HID / SPP / GATT stack and native support for BLE Audio CIS (Connected Isochronous Stream) and BIS (Broadcast Isochronous Stream) architecture. Headsets based on this solution can join the new-generation Bluetooth audio ecosystem such as Auracast broadcast audio, LE Audio hearing-aid compatibility and multi-device broadcast, which extends the product life cycle. On the RF side the BLE 1M receiver sensitivity is typically -97 dBm (255-byte packets) with a maximum TX power of 10 dBm and Class 1/2/3 power levels, a solid hardware basis for stable connections in demanding RF environments.
- 2.4 GHz private link with gaming-grade low latency: for gaming headsets and professional wireless audio the BP2640Ax supports a 2.4 GHz private bidirectional link with GFSK/DQPSK modulation at 1M/2M rates, bringing end-to-end wireless audio latency down to 5 ms or less. The channel works as an independent low-latency path next to Bluetooth, or combines with Bluetooth for 2.4G + Bluetooth dual-mode headsets that cover both gaming latency and daily Bluetooth compatibility.
- Hi-Fi audio performance for high-end positioning: 3 channels of 32-bit audio ADC and 3 channels of 32-bit audio DAC cover sampling rates from 8 kHz to 384 kHz and directly drive 16 Ω / 32 Ω headphone loads. High-resolution music playback, HD call pickup and live karaoke monitoring all benefit from a low-noise, low-distortion audio chain.
- On-device AI accelerator for smart audio algorithms: the built-in neural network accelerator accelerates u8×u8, u8×int8 and int8×int8 vector operations and runs local AI noise reduction, echo cancellation (AEC), howling suppression, original-sound removal and keyword spotting. Combined with the acoustic tuning capability of Liwei Electronic it enables clear calls in noisy environments, real-time vocal enhancement in live streaming, howling suppression and reverb in karaoke, and directional pickup with background noise reduction in gaming headsets.
- Rich interfaces and effect algorithms shorten development: 14 GPIO, 2x I2S/TDM, 2x S/PDIF (HDMI ARC), USB 2.0 full-speed / high-speed OTG, SDIO, SPI, I2C, UART and CAN make it easy to extend touch, LED, sensors, external codecs and storage. The Mountain View SDK provides more than 60 DSP algorithms and codecs, including 3D surround, virtual bass, parametric EQ, dynamic range compression (DRC), reverb, voice changing and frequency-shift howling suppression. Together with the Eclipse IDE and GCC toolchain this greatly shortens the software development cycle.
Audio Performance
| Item | Typical value (@48 kHz) |
| ADC dynamic range / SNR | ≥105 dB (MIC differential input, A-weighted) |
| ADC THD+N | -88 dB |
| DAC dynamic range | 106 dB |
| DAC SNR (differential output) | 120 dB |
| DAC THD+N (differential output) | -90 dB |
| Sampling rate range | 8 kHz – 384 kHz |
| ADC / DAC word length | up to 32 bit |
Target Applications
| Application | Solution value |
| TWS true wireless earphones | Bluetooth 6.0 dual mode + BLE Audio ready, HD calls and low-power standby |
| Over-ear Bluetooth headsets | Hi-Fi DAC directly drives 16/32 Ω loads, a clear sound quality advantage for large drivers |
| Gaming 2.4G + Bluetooth dual-mode headsets | 2.4 GHz private link under 5 ms for both gaming and daily use |
| Live karaoke headsets | 3-channel ADC supports microphone + line input with mature monitoring and reverb algorithms |
| Business call headsets | AI noise reduction + AEC keep voice clear in open offices |
| Educational / children headsets | Low-power architecture and small package fit kids over-ear and neckband forms |
Main Specifications
| Item | Parameter |
| Processor | 32-bit RISC dual core with SIMD / DSP / FPU |
| Memory | 640 KB SRAM, built-in Flash, XIP support |
| Bluetooth | Dual-mode Bluetooth 6.0, BR / EDR / BLE |
| BLE Audio | CIS / BIS supported |
| Receiver sensitivity | BLE 1M: -97 dBm; DH1 / 2DH5: -92 dBm |
| Transmit power | up to 10 dBm |
| 2.4 GHz radio | GFSK / DQPSK, 1M/2M rates, latency <5 ms |
| ADC | 3-channel 32-bit, SNR ≥105 dB, THD+N -88 dB |
| DAC | 3-channel 32-bit, SNR 120 dB (differential), THD+N -90 dB |
| Sampling rate | 8 kHz – 384 kHz |
| Interfaces | USB 2.0 HS/FS OTG, I2S/TDM, S/PDIF, SDIO, SPI, I2C, UART, CAN |
| Power supply | Single supply DC 3.0 V – 5.5 V |
| Package | QFN40, 5 mm × 5 mm |
| Operating temperature | -40 ℃ ~ +85 ℃ |
Services from Liwei Electronic
With over 10 years focused on audio and headset electronic solution design, Liwei Electronic delivers around the BP2640Ax:
- Complete PCBA solution design for TWS, over-ear, neckband, gaming dual-mode and live karaoke form factors
- Acoustic tuning and algorithm integration: EQ, noise reduction, call CVC, karaoke reverb and low-latency gaming optimization
- Structure and stacking advice based on the QFN40 5 × 5 mm package, optimizing the earcup cavity and antenna layout
- Pre-certification support for BQB, FCC, CE, SRRC and Telec wireless and audio certifications
- Mass-production delivery from chip + PCBA + test fixture to one-stop production service
FAQ
Q: Which types of Bluetooth headsets suit the BP2640Ax?
A: The BP2640Ax suits mid-to-high-end Bluetooth headsets that demand sound quality, low latency and protocol future-proofing, including TWS, over-ear, gaming dual-mode and live karaoke headsets. Its 3-channel ADC/DAC and AI accelerator also make it a strong fit for products that need multiple audio inputs and intelligent call noise reduction.
Q: What practical benefits do Bluetooth 6.0 and BLE Audio bring?
A: Bluetooth 6.0 improves connection stability, direction finding and low-power operation. BLE Audio supports new-generation broadcast audio (Auracast), lower-power audio transmission and hearing-aid compatibility, which helps products meet market demand over the next 3 to 5 years.
Q: How low is the latency of this solution?
A: The 2.4 GHz private wireless link of the BP2640Ax reaches an end-to-end latency below 5 ms, suitable for latency-sensitive scenarios such as gaming and live monitoring. In regular Bluetooth A2DP mode, combined with the protocol optimization of Liwei Electronic, the solution also reaches the mainstream low-latency level of the industry.
Q: Can Liwei provide samples and development boards?
A: Yes. According to the product definition of the customer, Liwei Electronic provides BP2640Ax reference designs, demo boards and schematics, and assists with acoustic tuning and software customization.
Contact Us
If you are evaluating a BP2640Ax Bluetooth 6.0 headset solution, or need complete PCBA customization for TWS, over-ear, gaming or live karaoke form factors, contact Liwei Electronic for detailed documentation and quotations.
Shenzhen Liwei Electronic Technology Co., Ltd. — audio headset electronic solution design with chip and complete PCBA packages, over 10 years of industry experience, serving 15+ well-known brands and 300+ clients.
