Bluetooth Dual Mode Audio SoC

General Description

The RT8763B series are single-chip Bluetooth ROM audio solutions for mono (RTL8763BM) and stereo (RTL8763BF/BFR, RTL8763BS, RTL8763BA) applications. The RT8763B is composed of an ARM core and an ultra-low power DSP core with high efficiency computing power, high performance audio codec, power management unit, ADC, ultra-low current RF transceiver, and smart I/O distribution controller.

The parameter configuration tools, the EVB kits, and the MP kits, including controller hardware and software, provide a simple and flexible procedure for customers to quickly design and proceed to mass production with Realtek’s new generation of audio solutions. These complete total solutions provide a fast and highly reliable development path with a very competitive R-BOM.



  • Bluetooth 5 specification compatible
  • Supports HFP 1.7, HSP 1.2, A2DP 1.3, AVRCP 1.6, SPP 1.2 and PBAP 1.0
  • Single-end RF radio output with high performance 10dBm of transmitter power and -94dBm 2M EDR receiver sensitivity
  • Supports Bluetooth classic (BDR/EDR)
  • Supports Bluetooth Low Energy (BLE)
    • Generic access service
    • Device information service
    • Proprietary services for data communication
    • Apple Notification Center Service (ANCS)
  • Real Wireless Stereo (RWS)
  • Supports USB type-C audio
  • Supports iAP2
  • Realtek’s latest RCV (Real Clear Voice) technology for narrowband and wideband voice connection, including wind noise reduction
  • Supports high resolution audio codec up to 24bits, 192kHz audio data format
  • Supports dual analog and digital MIC, AUX-IN, I2S digital audio, analog output
  • Supports high speed UART, I2C, SPI and USB2.0 compatible interface
  • Supports high resolution 12-bits multi-channel ADC
  • Supports PWM I/O and smart LED controller
  • Supports USB BC1.2 battery charging
  • Smart I/O distribution scheme with MUX
  • Built-in 8Mbits FLASH memory (RTL8763BF/RTL8763BFR)
  • Integrated dual switch mode power regulator, linear regulators, and battery charger; charging current up to 400mA
  • Built-in battery voltage monitoring and thermal protection scheme with external thermal resistor
  • SBC, AAC decoder support
  • Package: 5x5mm2 QFN40 (RTL8763BM, RTL8763BF, RTL8763BFR), 6x6mm2 QFN48 (RTL8763BS) and 8x8mm2 QFN68 (RTL8763BA) with 0.4mm pitch
  • Supports OTA and USB firmware upgrade
  • GSM 217Hz interference block out design
  • Low BOM cost
  • Green (RoHS compliant and no antimony or halogenated flame retardants)
  • Supports PTA (Packet Traffic Arbiter) when co-existing with Wi-Fi

Baseband Features

  • 40MHz main clock
  • Supports serial flash for FW storage and parameter upgrade
  • Adaptive Frequency Hopping (AFH)
  • Multi-link support
  • Supports Serial Copy Management System (SCMS-T) content protection

RAM and ROM Size

  • ROM size 768KB
  • MCU RAM size 16KB x 8 Data RAM + 8KB X 2 cache RAM
  • DSP RAM 8KB x 22


  • Supports TX +10dBm (typ.) maximum output power for Bluetooth classic
  • Supports TX +10dBm (typ.) maximum output power for Bluetooth BLE
  • Supports TX +4dBm (typ.) maximum output power for Bluetooth BLE low power TPM mode
  • Receive sensitivity: -94dBm (2Mbps EDR)
  • Receive sensitivity: -97dBm (BLE)
  • Receiver sensitivity: -106.5dBm (125K BLE long range)
  • Single-end TX/RX RF port without matching component required (when TX power is below +4dBm and using PIFA type PCB antenna)
  • Crystal oscillator with built-in integrated capacitor for clock offset digital tuning (0~20pF), could save 2-compensation CL cap following Realtek design guidelines


  • 32-bit ARM Cortex-M4F Processor
  • Supports hardware Floating Point Unit (FPU)
  • Supports Memory Protect Unit (MPU)
  • Supports SWD debug interface
  • Executed external SPI flash
  • 4-way association cache controller

DSP Audio Processing

  • Enhanced Tensilica Hi-Fi-mini compatible 24-bit DSP core
  • 2 single-cycle MACs: 24 x 24-bit multiplier and 56-bit accumulator
  • Supports G.711 A-Law, µ-Law, continuous-variable-slope-delta (CVSD) and mSBC voice codecs
  • Supports 8/16 kHz 1/2-mic noise suppression and echo cancellation
  • Packet Loss Concealment (PLC) for voice processing
  • SBC, and AAC-LC audio codecs supported for BT audio streaming

Audio Codec

  • Dual operation voltage range 2.8V and 1.8V
  • Supports cap-less, single-ended, and differential mode at the DAC path
  • Supports 16ohm and 32ohm speaker loading
  • Stereo 24-bit digital-to-analog (DAC) with 102dBA SNR
  • Stereo 24-bit analog-to-digital (ADC) with 97dBA SNR
  • 5-band configurable EQ at both DAC/ADC paths
  • Sampling rates of 8, 16, 32, 44.1, 48, 88.2, and 96kHz are supported.
  • Built-in MIC bias generator

Digital Audio Interface

  • Supports two PDM digital MIC inputs
  • Supports 24-bit, 192kHz on I2S digital audio
  • Sampling frequency 8/16/32/44.1/48/88.2/96/176.4/192kHz


  • Compatible with Bluetooth Core Specification including BR/EDR/LE-1M/LE-2M/LE-Coded (Long Range)
  • Fully integrated balun and synthesizer minimizes external components.
  • RF circuit design minimizes power-consumption while keeping excellent performance


  • Highly integrated PMU design for the system application
  • Dual switching mode regulator for digital core, radio and audio codec respectively
  • Built-in LDO for the I/O and FLASH memory
  • Built-in Li-Ion battery charger with up to 400mA charger current capability
  • Supports ambient thermal detection to detect the battery temperature
  • Built-in OVP, OCP, UVP protection to protect the system.

Operating Condition

  • Operating voltage: 2.8V to 4.35V (VBAT)
  • Temperature range: -20°C to +70°C


  • 5mmx5mm, QFN40 package (RTL8763BM)
  • 5mmx5mm, QFN40 package (RTL8763BF/BFR)
  • 6mmx6mm, QFN48 package (RTL8763BS)
  • 8mmx8mm, QFN68 package (RTL8763BA)


  • Mono headset
  • Stereo headset
  • Real Wireless Stereo (RWS) headset
  • Mono speaker
  • Stereo speaker