⚡ Realtek RTL8773J: the first "Bluetooth 7-ready" MCU targets high-speed audio

Realtek has announced the RTL8773J family, which CNX Software calls the first "Bluetooth 7-ready" microcontroller family seen to date. The chip pairs a 200 MHz Cortex-M55 application core (with MVE), a Cortex-M33 sensor/network core, dual HiFi 1s DSPs up to 400 MHz and a hardware accelerator for active noise cancellation, call voice clarity ("Talk Clear") and keyword spotting. Memory: up to 2 MB SRAM, 8 MB PSRAM and 16 MB on-chip flash.

The stakes are in the radio: the Bluetooth 7 specification now being finalized introduces HDT (High Data Throughput), up to 7.5 Mbps over a link — versus roughly 2 Mbps effective on today's BLE 2M. Realtek claims a house variant, "HDT+", reaching 15 Mbps, enough to carry lossless or near-lossless audio, giant firmware updates or multimodal sensor streams over the radio link alone. The chip is Bluetooth 6.2 first, with "pre-ratification" Bluetooth 7 features.

The targeting is explicit: earbuds, headphones and audio wearables — SBC/mSBC codecs, optional LC3/LC3plus/Opus, PDM microphones, line inputs, 15 dBm transmit power, Channel Sounding for spatial finding. In other words, the Bluetooth bandwidth race is being started by audio silicon vendors ahead of the standard's ratification, following in LE Audio's wake.

For makers there is nothing directly programmable yet, but the announcement telegraphs the roadmap for the next generation of headphones and embedded voice assistants. Source: CNX Software — Realtek RTL8773J