RTL8773D Series RTL8773D Series
RTL8773D Series

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

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Equipped with a transmitter and a receiver

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.

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Integrates multiple Bluetooth modes

It contains Bluetooth LE, Bluetooth Legacy, LE Audio and Auracast broadcast audio mode, thus fulfilling product requirements with state of art Bluetooth technology.

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Rich external interfaces

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.

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Streamlined Development

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.

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High-Performance DSP

Integrated HiFi-4 DSP with a maximum clock rate of 320MHz provides powerful digital signal processing capabilities.

Specifications

General Description
  • Bluetooth 6.0 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
RF Performance
  • 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
MCU Platform
  • 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)
Audio Codec Support
  • SBC codec
  • mSBC codec
  • AAC codec
  • LC3 codec
Peripheral (depends on part number)
  • 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
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RTL8773D Series

General Description
  • Bluetooth 6.0 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
RF Performance
  • 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
MCU Platform
  • 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)
Audio Codec Support
  • SBC codec
  • mSBC codec
  • AAC codec
  • LC3 codec
Peripheral (depends on part number)
  • 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

MCM Flash

16MB

8MB

16MB

16MB

MCM PSRAM

N

N

N

N

BLE Audio

Y

Y

Y

Y

A-MIC Number

×4

×4

×4

×4

ANC

Hybrid

Hybrid

Hybrid

Hybrid

GPIO (max)

50

50

50

50

USB

Y

Y

Y

Y

SPDIF

Y

Y

Y

Y

SPIC

×2 SPIC0, SPIC1

×2 SPIC0, SPIC1

×2 SPIC0, SPIC1

×2 SPIC0, SPIC1

Package (mm)

BGA184, 4.9×6

BGA184, 4.9×6

BGA184, 4.9×6

BGA184, 4.9×6

Applications

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Bluetooth Speaker

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TWS Headset

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Bluetooth Audio Adapter

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Auracast Broadcast Transmitter/Receiver

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TV Streamer Audio Transmitter

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Bluetooth Speaker

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TWS Headset

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Bluetooth Audio Adapter

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Auracast Broadcast Transmitter/ Receiver

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Hearing Aid

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Personal Sound Amplification Product

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Smart Glass

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Smart Pen

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.

Auracast™
Auracast™

Based on Bluetooth LE Audio technology, Realtek offers a one-stop solution covering Auracast™ Transmitter, Receivers, and Assistant roles. This solution features high integration and flexibility, supporting rich interfaces such as USB, I2S, SPDIF, and QSPI to adapt seamlessly to various audio sources and display devices. Leveraging its high-performance MCU and DSP capabilities, customers can rapidly develop diverse products suitable for public broadcasting and audio sharing scenarios.

Dual Mode Bluetooth Microcontroller
Dual Mode Bluetooth Microcontroller

The Realtek latest dual mode Bluetooth microcontroller solution, which is compliant with the Bluetooth® Core 5.4 standard, supporting both Classic Bluetooth and Bluetooth Low Energy. It integrates an extensive array of I/O interfaces — such as MIC, USB, Line-in, SPDIF, SDIO, SPI, and I2S — vastly expanding its application potential. Its high-performance MCU and DSP can flexibly manage both wired and wireless connections, and efficiently process audio algorithms to meet the diverse needs of wireless audio transmission and intelligent voice interaction.

Bluetooth TV Audio Streamer
Bluetooth TV Audio Streamer

The RTL8773DO can achieve dual Bluetooth audio mixing functionality with a single chip. This feature allows it to simultaneously receive Bluetooth audio signals from two links and play them back synchronously after mixing. One link connects to a Bluetooth audio streamer to enable low-latency playback, while the other link connects to a mobile phone, allowing the mixing of phone call audio and music audio with the audio stream from the Bluetooth audio streamer.

TWS
TWS

The Realtek true wireless stereo Bluetooth earphones use Realtek's high-performance Bluetooth chip to achieve fast and stable connections with low-loss transmission. With a professional audio processing solution, these earphones can deliver Hi-Fi stereo sound quality and are equipped with noise cancellation and ambient sound modes to ensure clarity in calls and music listening. Additionally, the earphones feature a low-power design to extend battery life, support touch controls, and have a lightweight and portable form, making them suitable for commuting, sports, and various other scenarios, providing users with a high-quality, unrestricted audio experience.

Smart Helmet
Smart Helmet

The Realtek Bluetooth technology in driver's helmets is revolutionizing the riding experience by enabling hands-free communication and allowing riders to stream music and podcasts directly to their helmets. This enhances both safety and entertainment on the go. Its compact form factor makes it easy to install in limited spaces. The technology also features advanced noise and wind resistance capabilities to ensure clear audio, and it offers ample GPIOs for designers to develop intuitive, distraction-free interfaces.

Smart Speaker
Smart Speaker

The Realtek smart speaker supports multiple audio input modes, including wireless connections like Bluetooth and wired connections like USB, Line-in, SPDIF, and I2S. This device not only supports local audio playback but can also share music in real-time with other devices, achieving seamless music sharing. Its design balances convenience and flexibility, making it suitable for various occasions and providing users with an efficient and enjoyable audio experience.

Bluetooth Hearing Aids
Bluetooth Hearing Aids

The Realtek dual architecture Bluetooth hearing aid solution includes a TWS dual-chip collaborative architecture and a highly integrated single-chip solution. Equipped with self-developed ultra-low latency technology, it can deliver nearly real-time environmental sound effects, effectively eliminating the sense of sound lag. This solution supports high-quality classic Bluetooth while being compatible with the LE Audio standard, efficiently receiving BIS and CIS audio streams to provide a stable and high-quality wireless audio experience.

Smart Glasses
Smart Glasses

Smart glasses are equipped with functions such as photography, video recording, AI interaction, live streaming, audio playback, calls, and voice control, making it easy for users to record and share anytime. The solution supports convenient operation via voice commands, and with innovative technology, it helps improve work efficiency, enrich learning, entertainment and social experiences, and enables a smart wearable lifestyle anytime and anywhere.

Smart Charging Case
Smart Charging Case

The Realtek smart charging case utilizes Bluetooth technology for seamless connection with headphones and smartphones. Equipped with Auracast™ technology, it revolutionizes the way users interact with audio devices, making it a critical node for audio information transmission. Additionally, the product supports various interfaces such as I2S, USB, ADC, SDIO, SPDIF, and QSPI, significantly enhancing versatility and providing robust support for a wide range of smart charging case products from entry-level to high-end.

Gaming Headset
Gaming Headset

The ultra-low latency dual-mode gaming headset integrates both 2.4G and Bluetooth connectivity options. In 2.4G mode, the headset connects to a computer or gaming console via a dedicated adapter, achieving precise audio-visual synchronization for an immersive gaming experience. In Bluetooth mode, the headset can stably connect directly to a smartphone, suitable for calls and high-quality music listening. The device is equipped with a one-touch switch function, allowing users to quickly handle incoming calls during gaming, easily balancing entertainment and daily communication needs.

Auracast™
Auracast™

Based on Bluetooth LE Audio technology, Realtek offers a one-stop solution covering Auracast™ Transmitter, Receivers, and Assistant roles. This solution features high integration and flexibility, supporting rich interfaces such as USB, I2S, SPDIF, and QSPI to adapt seamlessly to various audio sources and display devices. Leveraging its high-performance MCU and DSP capabilities, customers can rapidly develop diverse products suitable for public broadcasting and audio sharing scenarios.

Dual Mode Bluetooth Microcontroller
Dual Mode Bluetooth Microcontroller

The Realtek latest dual mode Bluetooth microcontroller solution, which is compliant with the Bluetooth® Core 5.4 standard, supporting both Classic Bluetooth and Bluetooth Low Energy. It integrates an extensive array of I/O interfaces — such as MIC, USB, Line-in, SPDIF, SDIO, SPI, and I2S — vastly expanding its application potential. Its high-performance MCU and DSP can flexibly manage both wired and wireless connections, and efficiently process audio algorithms to meet the diverse needs of wireless audio transmission and intelligent voice interaction.

Bluetooth TV Audio Streamer
Bluetooth TV Audio Streamer

The RTL8773DO can achieve dual Bluetooth audio mixing functionality with a single chip. This feature allows it to simultaneously receive Bluetooth audio signals from two links and play them back synchronously after mixing. One link connects to a Bluetooth audio streamer to enable low-latency playback, while the other link connects to a mobile phone, allowing the mixing of phone call audio and music audio with the audio stream from the Bluetooth audio streamer.

TWS
TWS

The Realtek true wireless stereo Bluetooth earphones use Realtek's high-performance Bluetooth chip to achieve fast and stable connections with low-loss transmission. With a professional audio processing solution, these earphones can deliver Hi-Fi stereo sound quality and are equipped with noise cancellation and ambient sound modes to ensure clarity in calls and music listening. Additionally, the earphones feature a low-power design to extend battery life, support touch controls, and have a lightweight and portable form, making them suitable for commuting, sports, and various other scenarios, providing users with a high-quality, unrestricted audio experience.

Smart Helmet
Smart Helmet

The Realtek Bluetooth technology in driver's helmets is revolutionizing the riding experience by enabling hands-free communication and allowing riders to stream music and podcasts directly to their helmets. This enhances both safety and entertainment on the go. Its compact form factor makes it easy to install in limited spaces. The technology also features advanced noise and wind resistance capabilities to ensure clear audio, and it offers ample GPIOs for designers to develop intuitive, distraction-free interfaces.

Smart Speaker
Smart Speaker

The Realtek smart speaker supports multiple audio input modes, including wireless connections like Bluetooth and wired connections like USB, Line-in, SPDIF, and I2S. This device not only supports local audio playback but can also share music in real-time with other devices, achieving seamless music sharing. Its design balances convenience and flexibility, making it suitable for various occasions and providing users with an efficient and enjoyable audio experience.

Bluetooth Hearing Aids
Bluetooth Hearing Aids

The Realtek dual architecture Bluetooth hearing aid solution includes a TWS dual-chip collaborative architecture and a highly integrated single-chip solution. Equipped with self-developed ultra-low latency technology, it can deliver nearly real-time environmental sound effects, effectively eliminating the sense of sound lag. This solution supports high-quality classic Bluetooth while being compatible with the LE Audio standard, efficiently receiving BIS and CIS audio streams to provide a stable and high-quality wireless audio experience.

Smart Glasses
Smart Glasses

Smart glasses are equipped with functions such as photography, video recording, AI interaction, live streaming, audio playback, calls, and voice control, making it easy for users to record and share anytime. The solution supports convenient operation via voice commands, and with innovative technology, it helps improve work efficiency, enrich learning, entertainment and social experiences, and enables a smart wearable lifestyle anytime and anywhere.

Smart Charging Case
Smart Charging Case

The Realtek smart charging case utilizes Bluetooth technology for seamless connection with headphones and smartphones. Equipped with Auracast™ technology, it revolutionizes the way users interact with audio devices, making it a critical node for audio information transmission. Additionally, the product supports various interfaces such as I2S, USB, ADC, SDIO, SPDIF, and QSPI, significantly enhancing versatility and providing robust support for a wide range of smart charging case products from entry-level to high-end.

Gaming Headset
Gaming Headset

The ultra-low latency dual-mode gaming headset integrates both 2.4G and Bluetooth connectivity options. In 2.4G mode, the headset connects to a computer or gaming console via a dedicated adapter, achieving precise audio-visual synchronization for an immersive gaming experience. In Bluetooth mode, the headset can stably connect directly to a smartphone, suitable for calls and high-quality music listening. The device is equipped with a one-touch switch function, allowing users to quickly handle incoming calls during gaming, easily balancing entertainment and daily communication needs.

*Specific applications may can only be supported by certain chips