the ADA project

ADA - All Digital Amp - aims to design a premium quality hi-fi audio amplifier (hardware and software) based on full digital amplifier ('fda') chips

The first requirements are:

• 2-way amplifier, about 60W at 8 ohms per voice
• digital sources only
  • USB Audio 2.0
  • SPDIF optical
  • SPDIF coaxial
  • HDMI-ARC
• auto-sleep
• auto-select source
• minimal MMI: power-on pushbutton, volume rotactor, audio-source rotactor, LCD panel, status LED

The board must be seen by a computer as a 2 channels 192kHz (or higher) sound card

It shall allow these lossless non-compressed audio formats

• AAC, WMA, OGG, WMA-L, ALAC, OPUS
• high resolution MQA, DSD, FLAC, WAV, AIFF

For later:

• Bluetooth AptX
• HDMI + CEC (TV remote-> amp)
• HDMI + HEC (TV ethernet-> amp)

first mockup

Built on

• an ST STM32F4 Discovery eval board based on an STM32F4 microcontroller
• a Texas Instrument TAS3251EVM eval board, contaning a TAS3251 FDA chip

See the mockup description and the software sources and documentation