Driver & Firmware Upgrade: https://download.shenzhenaudio.com/Gustard/
Adopting the latest USB audio interface solution ES8620 from ESS, USA
Supports up to PCM 32bit/768KHz and DSD512, and supports both DoP and Native DSD.
ESS's USB interface chip design is a completely optimized architecture for high-quality digital audio signal processing. It is not a general-purpose chip with USB digital audio interface code, so it has immediate impact on sound quality improvement;
A 128MB SDRAM is used as the system buffer and digital audio processing FIFO. Most of the space is used for internal scheduling of the USB interface master IC, and the redundant space is reserved as much as possible to ensure that other business logic operations other than the USB audio interface function in the main control IC do not interfere with the digital audio processing flow.
For optimal digital audio performance, digital audio processing FIFO capacity is reduced to a minimum to ensure minimum latency and jitter performance;
In order to ensure the highest quality digital audio signal and the lowest clock jitter performance, the machine uses up to three FPGAs to implement USB audio interface clock management and external 10M clock part of the audio clock frequency synthesizer, all using independent power supply to avoid FPGA Internal wiring interferes with each other;
In the USB audio interface part, an FPGA is used to implement the USB audio interface master IC running in the Slave mode.
That is, the USB interface main control IC receives the audio clock signal generated by the clock management FPGA and outputs only the digital audio data signal, thereby minimizing the digital signal interference introduced by the USB transmission link;
The audio clock synthesizing circuit of the external 10M clock part uses two FPGA main clock frequency synthesizers corresponding to the 44.1KHz and 48KHz fundamental frequencies respectively, which avoids the crosstalk of the internal wiring of the FPGA on the one hand, and also drains the FPGA chip on the other hand. The related resources, the frequency accuracy and jitter performance of the final synthesized audio main clock signal have reached the limit performance level of the current design;
The local audio clock source uses a dual femtosecond clock. This unit uses two US ACCUSILICON AS318-B ultra low phase noise crystals as the local audio clock source, RMS jitter as low as 88 femtoseconds (10Hz-1MHz); built-in audio dedicated toroidal transformer.
Built-in audio dedicated toroidal transformer;
USB port: USB Type-B female port, support USB2.0
10M BNC input: input impedance 50 Ohm, maximum input amplitude 16dBm
RCA coaxial S/PDIF port: output impedance 75 Ohm, output level 500mVpp @75 Ohm load
XLR AES3 port: output impedance 110 Ohm, output level 2.1Vpp @110 Ohm load
OPTICAL TOSLINK port: 24bit 44.1k-192k /DOP64
Multi-function BNC port:
output impedance 75 Ohm, S/PDIF output level：750mVpp @75 Ohm load
Word Clock output level：3.3Vpp MAX @ noload
S/PDIF support specification (when S/P OUT is selected): 24bit 44.1k-384k/DOP64-128
Word Clock output frequency (when WCK OUT is selected): PCM: 44.1k-768k.
IIS over HDMI interface (non-standard HDMI interface):
differential I2S signal with LVDS output level,
PCM: 32bit 44.1k-768k, DSD 2.82M-22.57M (DSD64-DSD512)
AC power supply: AC 115V/230V 50/60Hz
Power consumption: <15W
Dimensions: width 220mm * height 50mm * depth 170mm (without protruding parts)
Weight: 2.5Kg (including packaging)