AUDIO-GD 'R2R-7' Balanced FPGA DAC

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Audio GD R2R 7 Fully Discrete Real Balanced R-2R FPGA DAC

A far better design with switching resistors in parallel mode.
An ultra-fast FPGA controls and corrects the R2R ladder.
The parallel design mode controls every bit respectively and therefore achieve unprecedented performance.
Only 1 clock cycle is needed to output all data while serial design needs at minimum 8 up to 24 clock cycles.
Designed properly to correct every bit of the ladder and the unavoidable imperfections of the R2R ladder caused by tolerance of resistors and glitches to achieve best performance.

High performance SPDIF interface, replacing traditional less good performing SPDIF interface chips like DIR9001, WM8805 or AK411X,etc.
Full re-clocking process with FIFO design applicable on all inputs. This way the output data keeps fully synchronized with the clock signal to reject any jitter.
Built in 2X, 4X and 8X oversampling and digital filters and on top of this 4 different true NOS (only analog 6dB filtering) modes. To completely configure it to your liking!

The signal last stage is the analog output stages, they can much effect the whole DAC sound quality.
After d/a conversion by the R2R D/A modules the analogue signal is transported by fully discrete matched-transistor output stages.
DC-coupled design with first class through-hole components. No SMD components are applied. The high speed special ACSS output stages are non-feedback and current driven design.
Special because almost all other designs need to convert the signal multiple times from and to current or voltage, resulting in less detail and less good staging.
The output buffers are single ended FET. Two stages in parallel to reach very low output impedance. All output stages are in pure class A design without any (negative) feedback to achieve purest and a real live sound reproduction.
The 4 OPA opamp’s are functioning as DC servo, this way no coupling-capacitors are needed and DC output is automatically biased! Resulting in a perfectly neutral sound.
There are no relays or other switches in the signal path after DA modules to perform the best and purest sound quality.

The DAC has 3 high quality low noise, low flux leakage, R-cores transformers.
In total 130W power to supply all digital parts and the left and right analog boards. The DC power is distributed over 19 separate power rails. All are pure class A low noise regulated power; fed by 3 groups linear power supplies.
This results in ultra-high speed and ultra-low noise performance. Clean and independent power for all different parts to achieve highest quality.

Manufacturer's Product Site: www.audio-gd.com
European Distributor: www.audiophonics.fr