Hi there.
I have some questions about the output current of the PCM1792a.
I sense the output current with a resistor. I read, when the dac is stopped, 1,56mV on a 27 Ohm, or 578mV on a 100 Ohm resistor: that means the output current is 5,78mA. Why not 6,2mA as stated on the documentation? I've read many times the data-sheet, but i didn't find any explanation for this strange thing. For example, I see an output pin named "IREF - Output current reference bias" pin, connected to ground through a 10KOhm resistor in the application circuit schematic. Is there any relationship between the steady-state output current and that resistor? What is, if exists, the relationship between this pin and steady state level of output current?
Other question: if I use a resistor for sensing the output currente, what is the limit value of that resistor after that the quality of the output signal degrades significantly?
Thank you in advance for answer.