There was some initial interest in using Nelson's Zen I/V stage with the Saber DAC. I share this interest and to make it easier to follow, this thread will be dedicated to the Zen I/V adapted to the Saber.
The Saber32 9018 DAC chip from ESS has eight outputs that can be used as eight independent channels (surround sound anyone), or 4 outputs paralleled to make two channels, or even all eight paralleled into a mono channel per chip. I looked first at what it would take to make a single output from the Saber work with the Zen I/V, then a stero version. The 9012 and other Saber chips can also easily be used in the same ways, but I will concentrate on the 9018 for now.
Here is the Zen I/V in stock form but with a second one added to form a balanced stage:
The 220 ohm and 1K resistors have been combined and the 220uf cap removed for clarity. Since the Simulation uses 0 ohms for the source impedance and there is no noise on the +/-30V supplies here, they do not contribute to the sim and can be added back once built depending on your tastes and what you feed this with. As in the original, 10mA P-P in results in approximately 2V RMS output.
More in the next post...
Dave
The Saber32 9018 DAC chip from ESS has eight outputs that can be used as eight independent channels (surround sound anyone), or 4 outputs paralleled to make two channels, or even all eight paralleled into a mono channel per chip. I looked first at what it would take to make a single output from the Saber work with the Zen I/V, then a stero version. The 9012 and other Saber chips can also easily be used in the same ways, but I will concentrate on the 9018 for now.
Here is the Zen I/V in stock form but with a second one added to form a balanced stage:
The 220 ohm and 1K resistors have been combined and the 220uf cap removed for clarity. Since the Simulation uses 0 ohms for the source impedance and there is no noise on the +/-30V supplies here, they do not contribute to the sim and can be added back once built depending on your tastes and what you feed this with. As in the original, 10mA P-P in results in approximately 2V RMS output.
More in the next post...
Dave