Nordic Semiconductor recently released its nRF5340 Audio Development Kit (DK), a design platform for rapid development of Bluetooth LE Audio products. The audio DK contains everything needed to get started on LE Audio development projects. It is based on Nordic’s nRF5340 system-on-chip (SoC), boasting two Arm Cortex-M33 processors.
LE Audio is described by the Bluetooth Special Interest Group (SIG) as “the future of wireless sound.” The technology is based on the Low Complexity Communications Codec (LC3), an enhanced replacement for the low complexity sub-band codec (SBC) used by Classic Audio. LC3 ensures that LE Audio features both improved audio quality and better battery life than Classic Audio in all use-cases.
Extensive listening tests have shown that at all sample rates, the audio quality of LC3 exceeds that of SBC at the same sample rate and provides equivalent or better audio quality at half the wireless data rate. This lower data rate is a key factor in minimising the power consumption of LE Audio products. LE Audio also brings true wireless stereo (TWS) and other new functions to wireless audio, including audio sharing.
The nRF5340 Audio DK is highly configurable, allowing it to function as a USB dongle to send and receive high-quality audio data from a PC, a business headset or a TWS earbud (most use-cases require two or more nRF5340 DKs). The kit includes two 3,5 mm audio jacks for analog ‘in’ and headphones ‘out’; five user-programmable buttons and LEDs; an SD-Card holder for extra storage; a Segger J-Link debugger for programming and debugging, and connectors to access the analog/digital interfaces and GPIOs.
The DK is typically powered via USB but also has a battery connector for a Li-ion/Li-Po battery. The current consumption can be measured on the board and by using the dedicated current measurement pins and Nordic’s Power Profiler Kit II or other current measuring equipment.
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