Nordic Semiconductor BLUETOOTH® LE Audio Auracast™

Auracast delivers scalable audio for personnel use and public applications such as:

• Audio sharing: Multiple users can listen to the same shared audio broadcast of a video or song using personal Auracast earbuds, headphones, or hearing aids
• Audio broadcasts from TVs and screens: Multiple users can receive broadcasts from a single muted TV in a bar or gym
• Audio broadcasts from public address, signage, and sound systems: Never miss a train announcement again, in stations, airports, and transport hubs, important messages can be broadcast across devices, expanding accessibility for visitors with hearing aids
• Replacement of current telecoil solutions for public venue hearing aid systems

Venues can easily add Auracast by plugging a stand-alone LE Audio transmitter into existing line-level outputs without installing perimeter cabling as with hearing loops.

A Nordic Auracast-ready earbud or receiver layers LE Audio profiles such as the Basic Audio Profile (BAP) and the Public Broadcast Profile (PBP), with an assistant interface for discovery, and (optional) broadcast codes for controlled access. The result is a scalable one-to-many audio with lower latency and improved battery life compared to Classic Bluetooth.

Associated Products

Nordic Semiconductor nRF54LM20A System-on-Chip (SoCs)
An ultra‑low‑power multiprotocol Bluetooth LE SoC with up to 2MB NVM/512KB RAM and rich peripherals, providing the headroom and radio needed to implement compact Auracast LE Audio broadcasters or receivers.

Nordic Semiconductor nRF5340 Multicore System on Chip
A dual‑core Bluetooth LE device optimized for LE Audio, supplying the application and network processing to run LE Audio stacks and enable Auracast listening experiences in earbuds, headsets, and hearing devices.

Nordic Semiconductor nPM1304 Power Management ICs
nPM1304 powers Auracast receivers on tiny cells; it supports a minimum charging current of 4mA, precision fuel gauging, system monitoring, and I²C control for compact, low-power audio designs.

Analog Devices ADAU1787 Low Power Codec with Audio DSPs
The ADAU1787 combines low‑latency 24‑bit ADCs/DACs with dual on‑chip DSPs (FastDSP + SigmaDSP). Process ANC/beamforming/EQ functions locally and manage up to 4 analog and 8 digital mics via flexible I²S/TDM audio ports before the LE Audio path.

Analog Devices SSM6515 Ultra‑Low Power Class‑D Audio Amplifier
An ultra‑low‑power, digital‑input mono Class‑D amplifier optimized for wireless headphones, delivering up to 85mW into 16 Ω, >90% efficiency, 113dB SNR, and supporting PDM/I²S/TDM in a tiny 11‑ball WLCSP.

Analog Devices MAX20366 Wearable Power Management IC
Compact PMIC with ultra-low IQ regulators, charger, fuel gauge, and haptic driver for small battery-powered wearables.

Molex Quad‑Row Board‑to‑Board Connectors
Ultra-compact board-to-board connector, which is also available with an integrated EMI shield (Quad‑Row Shield). With a staggered four-row layout, the Quad-Row saves space and cuts noise in dense earbud stacks.

Molex Premo‑Flex Cable and Easy‑On Connectors
Shielded Premo Flex FFCs and Easy On connectors reduce EMI and speed manufacturing and assembly for wearables and personal audio devices.

Analog Devices Inc. ADXL366 3-Axis Digital Output MEMS Accelerometers
Ultralow‑power 3‑axis accelerometer for wear detect, tap controls, and wake‑on‑motion, enabling auto‑pause and saving battery in earbuds.

Kyocera AVX 9005868 – 2.4GHz Corner Chip Antenna
Ultra-small antenna delivering 4dBi gain and high efficiency, ideal for compact Auracast-enabled earbud designs.

Kyocera AVX 9002300L0-L04 BLE LDS “Bud” Antenna
Using Laser Direct Structuring technology, this “Bud” 2.4GHz antenna offers uniform phase stability in all directions for dependable LE Audio and Auracast broadcast performance.