AUDIO GD pushes the limits of a DAC 24BIT 384khz based on R2R technology corrected by DSP FPGA. the DAC R2R 2 offers a formidable ratio pricing pleasure always allied with the technical choices that make AUDIO GD today a major player of the High Definition converters.
The advantage of discrete R2R DACs
A discrete R2R DAC is known to be superior to an integrated R2R chip setup like PCM1704K or AD5791 offering a more natural listening acumen. The technical advantages are: The R2R DACs filter the noise of clocks that are not found on the analog signal. The R2R DACs are less sensitive to jitter on the 16bit definitions. The analog signal is theoretically more accurate than a DAC based on Delta Sigma technology.
A DSP FPGA processor
The DSP FPGA installed in the DAC AUDIO GD R2R 2 allows to overcome the inaccuracy of the resistances beyond 16/21 bit. We thus benefit from anot high precision even in High Definition 24 bit 384khz. These technical qualities are also: better processing from the SPDIF (coaxial, optical) inputs than the usual integrated interfaces (WM8505, DIR9001) thanks to faster computing power and FIFO buffer stages reducing the jitter drastically.
Analogue stages in pure class A
Based on an expertise of over 20 years, kingwa designer AUDIO GD excels in creating analog stages without counter-reaction. The output circuit of the DAC R2R 2 benefits from this long research work incressant with stages entirely discrete transistors sorted and paired. There are no surface components and minimal components on the signal path. The last buffer stages are single-ended FET-type transistors with two-stage parallel bandwidth guaranteeing a low output impedance. this latter part has no capacitors in the signal path. Well-on this converter has high-speed outputs with high-current ACSS stage. There is no relay on the analogue circuit in the pure spirit "less is better".
24bits 384kHz R2R scale
Digital Input Sensitivity
0.5V pp (75Ω Coaxial), 19dB on Toslink optics
Distortion rate per harmonic
0.003% over 20 to 20kHz unweighted
20 to 20kHz
Output Voltage Level
2.5V (RCA), 2mA (ACSS)
Adjustment oversampling by jumper
X2, X4, X8
Non Over Sampling Mode (NOS)
Sampling rate per digital inputs
USB and HDMI LVDS I2S
PCM 44.1kHz - 384kHz to 16-32bits
USB and HDMI DSD
DSD64 to DSD256
Input SPDIF Coaxial
24bits max 44.1kHz-192kHz
Input SPDIF Optical
24bits max 44.1kHz - 96kHz
Windows 7, 8, 8.1, 10 (requires a driver), MAC OS 10 and Linux
Double TCXO high precision clocks
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Linear 3-stage power supply with 5 groups, low noise class A
240 x 320 x 80mm
1x USB cable, 1x IEC power cable
Mapping I2S / LVDS
A synthesis of main IIS on LVDS pinouts mapping is available here.
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