On December 12, 2019 , Dalian General Holdings, a leading semiconductor component distributor dedicated to the Asia-Pacific market, announced that its subsidiary Youshang has launched a Bluetooth gallstone audio solution based on Realtek RTL8763BF.

With the improvement of living standards, people pay more and more attention to both work and entertainment, and it has become the wish of many people to have their own audio equipment. However, the dazzling product models and tens of thousands of sales prices on the market make most common enthusiasts out of reach. In order to allow everyone to truly enjoy the high-fidelity audio-visual fun, Dalian Dayou has launched a wireless Bluetooth gallstone audio solution based on Realtek 8763BF. The solution is designed to meet the needs of ordinary audio enthusiasts, and strives to be simple and easy to use. Currently, the Bluetooth audio of lossless transmission is used, and the playback sound is clear and beautiful, which is sought after by the majority of audiophiles.

Figure 1 - Dalian Dayoushang launched the display board of the Bluetooth gallstone audio solution based on Realtek products

The bluetooth gallstone speaker refers to a wireless bluetooth gallstone amplifier with a perfect combination of electronic tubes and transistors. In addition to the combination of electronic tubes and transistors, this solution is also matched with the Realtek 8763BF wireless Bluetooth solution, so it has become a new application in the Bluetooth chip solution.

The advantages of the transistor machine lie in its high current and wide frequency band. Its low frequency control, analytical power when dealing with large scenes, layering and brightness are superior to those of the tube machine; while the tube machine is relatively smooth in the high-frequency range and has enough air. It has a sense of sound and has a sound color that a considerable number of people like. This solution is compatible with the sound of the tube and has the fast explosive power of the transistor. Although the effect of using the Bluetooth wireless audio source will inevitably lose some sound quality, but through the perfect combination of the tube + transistor amplifier, the sound quality can be restored very realistically. Through the new application of wireless bluetooth, the sound solution of the gallstone amplifier of the tube machine and the transistor machine not only fully integrates and exerts their own strengths, but also makes up for their own shortcomings.

Figure 2 - The block diagram of Dalian Dayoushang's Bluetooth gallstone audio solution based on Realtek products

Core technical advantages

Main chip: RTL8763BF; Package: 5 x 5mm 2QFN 40 (RTL8763BM, RTL8763BF, RTL8763BFR), 6 x 6mm 2QFN 48 (RTL 8763BS) and 8 x 8mm 2QFN 68 (RTL8763BA), 0.4mm pitch;

Key support: maximum 8 key customization (Play, MODE, NEXT, PREV, VOL+, VOL-, FI, CONNECT);

Support DC5V wake-up;

Audio input interface: Stereo AUX In input, 2 single-ended MIC In, SPDIF Rx input, PCM / I2S RX input, support I2S TX&RX 5-wire mode;

Audio output interface: supports stereo analog output AOUTL / AOUTR; supports I2S TX digital output, supports I2S TX & RX 5-wire mode; supports simultaneous output of AOUTL / AOUTR and I2S TX, with the same volume adjustment; supports headphone direct drive output;

Peripheral interface: 2 channels UART TX / RX, 2 channels PWM, 1 channel SPI, GPIOIO port supports SIRQ mode, supports 10 channels 10Bits precision 2KHz frequency LRADC sampling;

Charging interface: chip supports charging function;

Firmware storage: built-in 1M Bytes SPI Nor flash as program memory, the program can be upgraded; support external SPI NorFlash as program memory, maximum 16M Bytes SPI Nor flash;

Data storage: ROM size 768 KB, MCU RAM size 16 KB x8, data RAM +8KB X2, cache RAM & DSP RAM 8KB x2;

Program Specifications

Bluetooth: Supports stereo Bluetooth headset, supports Bluetooth RWS to answer calls and play songs, supports speaker end to adjust volume, answer/hang up calls, etc. The module has passed Bluetooth 4.2 dual-mode BQB certification and Bluetooth 5.0 Controller Component and Host Component BQB certification

AUX In: Support AUX input

FM function: support FM input

User interaction: support status broadcast of speakers & headphones, key tone boost, volume adjustment, etc.

OTA upgrade: support the client OTA upgrade function