Introduction
The RTL8773D series is Realtek's dual-mode Bluetooth controller solution, featuring high-quality audio and a wide range of external interfaces, enabling quick upgrades of wireless Bluetooth audio transmission capabilities to your media devices. It is also suitable for mobile devices. The series can be used in Auracast transmitters, receivers, hearing aids, PSAP devices, audio toys, charging cases with displays, Bluetooth helmets, smart glasses, smart pens, and Bluetooth audio receivers for home stereo speakers.
DESCRIPTION
CHIP
Highlights
Having both a transmitter and a receiver can increase the variety of products designed by customers. Users can also choose a mode of operation through dynamic switching.
It contains Bluetooth LE, Bluetooth Legacy, LE Audio and Auracast broadcast audio mode, thus fulfilling product requirements with state of art Bluetooth technology.
Supports I2S/Line In /SPDIF In to connect audio data; while digital interfaces such as GPIO/I2C/UART/SPI can be connected to a wider range of sensors or external devices.
Comprehensive SDK/HDK/Tools development kits, UI design tools, and supporting mobile APP projects. Provision of mature solutions. Provision of mature reference designs. Significantly reduces workload for customer project development, shortens development cycles, and accelerates project implementation.
Integrated HiFi-4 DSP with a maximum clock rate of 320MHz provides powerful digital signal processing capabilities.
Specifications
- Bluetooth 5.4 core specification
- BR/EDR/LE-1M/LE-2M
- LE audio (depends on part number)
- OTA (Over-the-Air) FW upgrade
- Support speaker out
- Analog mic input
- Digital mic input
- Built-in LDO for the I/O and FLASH memory
- Built-in Li-Ion battery charger with up to 400mA charger current
- Maximum transmission power 10.0 dBm @EDR 2M (for details, please refer to the datasheet)
- Maximum transmission power 12.5 dBm @BLE (for details, please refer to the datasheet)
- Receiver sensitivity -96.0 dBm (1M BR)
- Receiver sensitivity -96.0 dBm (2M EDR)
- Receiver sensitivity -101.0 dBm (1M BLE)
- Fast AGC control to improve receiving dynamic range
- Cortex-M4F, 32-bit ARMv8M mainline processor, maximum frequency 160MHz
- Total of 532KB MCU/DSP shared SRAM
- HiFi-4 DSP, 32-bit, maximum frequency 320MHz
- Total maximum of 3.4MB DSP RAM
- Supports AES 128, SHA256, RSA-3072 encryption and decryption engine
- Built-in Flash 8MB/16MB (depending on part number)
- SBC codec
- mSBC codec
- AAC codec
- LC3 codec
- Flexible GPIO Design
- Real Time Counter(RTC)
- 4 CH 12 bits ADC
- USB 2.0
- I2C
- I2S interface for external audio processor
- UART
- Line in, L/R channel
- SPI
- PDM interface for digital mic input
- PWM
- SPIC
- SPDIF (depends on part numbers)
- Available GPIOs : 50 pins
- Bluetooth 5.4 core specification
- BR/EDR/LE-1M/LE-2M
- LE audio (depends on part number)
- OTA (Over-the-Air) FW upgrade
- Support speaker out
- Analog mic input
- Digital mic input
- Built-in LDO for the I/O and FLASH memory
- Built-in Li-Ion battery charger with up to 400mA charger current
- Maximum transmission power 10.0 dBm @EDR 2M (for details, please refer to the datasheet)
- Maximum transmission power 12.5 dBm @BLE (for details, please refer to the datasheet)
- Receiver sensitivity -96.0 dBm (1M BR)
- Receiver sensitivity -96.0 dBm (2M EDR)
- Receiver sensitivity -101.0 dBm (1M BLE)
- Fast AGC control to improve receiving dynamic range
- Cortex-M4F, 32-bit ARMv8M mainline processor, maximum frequency 160MHz
- Total of 532KB MCU/DSP shared SRAM
- HiFi-4 DSP, 32-bit, maximum frequency 320MHz
- Total maximum of 3.4MB DSP RAM
- Supports AES 128, SHA256, RSA-3072 encryption and decryption engine
- Built-in Flash 8MB/16MB (depending on part number)
- SBC codec
- mSBC codec
- AAC codec
- LC3 codec
- Flexible GPIO Design
- Real Time Counter(RTC)
- 4 CH 12 bits ADC
- USB 2.0
- I2C
- I2S interface for external audio processor
- UART
- Line in, L/R channel
- SPI
- PDM interface for digital mic input
- PWM
- SPIC
- SPDIF (depends on part numbers)
- Available GPIOs : 50 pins
Part Number Comparison
| Part Number | RTL8773DO―CG | RTL8773DFL―CG | RTL8773DO―VHA―CG | RTL8773DO―VAI―CG |
|---|---|---|---|---|
MCU | 40Mhz/80Mhz/120MHz/160MHz | 40Mhz/80Mhz/120MHz/160MHz | 40Mhz/80Mhz/120MHz/160MHz | 40Mhz/80Mhz/120MHz/160MHz |
HiFi4 DSP | 320MHz | N | N | 320MHz |
LE audio | Y | Y | Y | Y |
MCM Flash size | 16MB | 8MB | 16MB | 16MB |
MCM PSRAM size | N | N | N | N |
A―MIC | 4 | 4 | 4 | 4 |
ANC | Hybrid | Hybrid | Hybrid | Hybrid |
USB | Yes | Y | Y | Y |
GPIO(max) | 50 | 50 | 50 | 50 |
SPDIF | Y | Y | Y | Y |
SPIC | 2, SPIC0, SPIC1 | 2, SPIC0, SPIC1 | 2, SPIC0, SPIC1 | 2, SPIC0, SPIC1 |
Package (mm) | BGA184, 4.9x6 | BGA184, 4.9x6 | BGA184, 4.9x6 | BGA184, 4.9x6 |
Applications
Learn about the typical application cases that the RTL8773D series can be used to implement. Of course, there are more applications waiting for you to discover.
Our solution enables seamless Auracast broadcast transmission, reception, and assistant functionality, integrating these features into your system for a comprehensive Bluetooth application. Utilizing a powerful MCU and DSP combination, it supports specialized processes and display capabilities for presenting visual information. With flexible audio interface options including I2S, USB, and analog ADC, it offers extensive connectivity to various external audio sources, ensuring a versatile and robust broadcasting experience.
Our advanced dual-mode Bluetooth MCU solution enhances platform connectivity, seamlessly integrating systems and easily transitioning from wired to wireless. The versatile combination of MCU and DSP simplifies the realization of specific application processes, sensor requirements, or voice algorithm demands. Its extensive GPIO options, such as I2S, USB, and Analog ADC, provide exceptional flexibility for external interfaces. Whether it’s improving audio quality, expanding connectivity options, or enhancing sensor integration, our solution fully maximizes the platform's potential.
The RTL8773DO can support dual Bluetooth audio mixing functionality on a single chip. This feature enables the simultaneous reception and mixing of audio from two Bluetooth links, followed by simultaneous playback. One of the two links connects to a Bluetooth audio streamer, achieving low latency. The other link can connect to a mobile phone, allowing the mixing and playback of phone call audio or music audio with the audio stream from the Bluetooth audio streamer.
Our solution enables seamless Auracast broadcast transmission, reception, and assistant functionality, integrating these features into your system for a comprehensive Bluetooth application. Utilizing a powerful MCU and DSP combination, it supports specialized processes and display capabilities for presenting visual information. With flexible audio interface options including I2S, USB, and analog ADC, it offers extensive connectivity to various external audio sources, ensuring a versatile and robust broadcasting experience.
Our advanced dual-mode Bluetooth MCU solution enhances platform connectivity, seamlessly integrating systems and easily transitioning from wired to wireless. The versatile combination of MCU and DSP simplifies the realization of specific application processes, sensor requirements, or voice algorithm demands. Its extensive GPIO options, such as I2S, USB, and Analog ADC, provide exceptional flexibility for external interfaces. Whether it’s improving audio quality, expanding connectivity options, or enhancing sensor integration, our solution fully maximizes the platform's potential.
The RTL8773DO can support dual Bluetooth audio mixing functionality on a single chip. This feature enables the simultaneous reception and mixing of audio from two Bluetooth links, followed by simultaneous playback. One of the two links connects to a Bluetooth audio streamer, achieving low latency. The other link can connect to a mobile phone, allowing the mixing and playback of phone call audio or music audio with the audio stream from the Bluetooth audio streamer.
*Specific applications may can only be supported by certain chips
