SU-6 is a new generation of USB interface developed by us. It is located in the high-end interface. Compared with our products in the past, SU-6 mainly uses the following four new technologies independently developed:

1. Built-in CPLD pre-shaping technology and source synchronization technology based on FPGA reshape the isolated I2S signal, thus eliminating the additive jitter caused by the isolation chip.

2. The new design of the FPGA algorithm, built-in FIFO buffer data before output, SPDIF output using FPGA re-coding, so that coaxial output can support PCM 384K and DSD DOP128.

3. Using CRYSTEK’s CHD-957 high-performance femtosecond crystal oscillator, cooperating with self-developed constant temperature system and ultra-low noise supercapacitor power supply system, the short-term stability of the clock is further improved.

4. Unique single clock system, all the circuits of the whole machine are designed with synchronous clock. The USB clock is synthesized by PLL from femtosecond clock.