The UAC-1 USB digital interface is used to convert USB digital signals into coaxial digital signals or directly output I2S signals. Unlike the USB solutions using Italian amanero or XMOS on the market, it is designed based on HIFI requirements and is completely self-developed based on our years of experience in digital player design. It does not use ordinary asynchronous or synchronous modes and can be used for PCs, Android and Apple phones, as well as various Linux distribution boards
We have adopted a new optimization mode for the transmission of HIFI audio over USB cables, and implemented a local FIFO at the receiving end to ensure more stable data transmission and output. The use of USB data is similar to the local playback mode, which will open up a new era for PCHIFI. Even if it is only connected to a mobile phone, as long as it can ensure that it is software with source code output, it can still achieve very good playback effects. (UAC-1 has been confirmed by hundreds of users to have strong capabilities/2022-12-7)
The UAC-1 interface uses RTOS real-time operating system dual threading, with an SC switched OCXO constant temperature crystal oscillator as the system clock to ensure super stable thread operation.
Multi level and multi-channel voltage regulation design provides pure and stable supply for each part of the circuit.
MCLK adopts two independent clocks of 22.5792/24.576MHz with an improved 957 discrete circuit, which is the basic guarantee of output quality.
UAC-1 adopts FS level USB transmission and supports 44.1/48/96KHZ PCM output. FS is more stable for low bit rate PCM transmission compared to HS. Even if we release higher-level self-developed interfaces in the future, we will continue to use FS transmission design for low bit rate PCM, which is currently unparalleled.
The USB cable of UAC-1 does not require a 5V cable, and the entire circuit uses an external power supply. Due to the built-in OCXO, please use a power supply of 7.5 to 10V with a current of 1 to 3A.
UAC-1 has three output modes, namely SPDIF coaxial (RCA socket), 4SMA (for DIY enthusiasts), I2S OVER HDMI. Note that the output phase of the HDMI interface is+-+-+-.
Due to its built-in firmware upgrade function (currently the firmware is mature and does not need to be upgraded), when the user places the switch in fixed upgrade mode, the UAC-1 will be recognized as a 2Mb USB flash drive. When the new firmware is placed in the drive and the switch is turned back to sound card mode, the upgrade will start. After 1 minute, the upgrade is completed and automatically enters sound card mode. The RST button on the panel is the system reset button.
The size of UAC-1 is 10 * 10 * 6.5CM. This link is for single machine price and does not include power and cable accessories. Please note.