AMANERO COMBO768 Digital Interface USB 1536kHz to I2S / DSD

The Amanero Combo768 is an USB audio interface designed for OEM applications. USB PCM audio data (2 channels) accepted as input are converted into an I2S stream or a native DSD stream. Supported PCM sampling frequencies range from 44.1kHz to 1536kHz. The maximum sample rate can be limited to 192kHz, 384kHz, or 768kHz. The DSD format is decoded both in DoP format (FA05 token) and in native format. In DoP format, the maximum sample rate is DSD512, while in native DSD format, the maximum sample rate is DSD1024.

On Windows, no kernel mode drivers are required, as system USB drivers are used, ensuring they are always up to date. Additionally, a ASIO driver is provided to support native DSD from DSD64 to DSD1024. On Linux, with a kernel supporting native DSD, you can achieve up to DSD1024. Native DSD support in Linux is constrained by the USB VID/PID. The Combo768 base board uses VID=0x16d0 and PID=0x0A23, values already included in many Linux distributions as enabled for native DSD. Clock signals can be generated by two low phase noise oscillators at 45.1584MHz/49.152MHz or directly from the 24MHz XTAL that powers the CPU.

The CPU is a Cortex-M7 NXP IMXRT1011 and the external flash is W25Q32. The power supply requires 3.3V and 1.2V. An incoming DSD stream is indicated by an asserted signal in a specific DSD ON pin of the output comb connector and the I2S DATA and I2S FSCLK pins become the DSD Left/Right output pins.

The module works in Master Mode only.