Can somebody help me? I would like to use the PCM1796 with passive termination. I need 0,4Vpp differential output voltage. I looked for but I didn't find any details about the current segment DAC of PCM1796.
The output of the DAC between is between -1,5m..-5,5mA I thought it is a current sink DAC. But in the recommended Application Circuit (datasheet page34) U1 output voltage is -1,23V...-4,51V to the ground that means for me the converter is an current source DAC. What is the "truth" or what did I missed?
Is the passive termination possible like on the picture or connect to VCC?
Check out page 55 of the d/s. It discusses output current.
Unfortunately, we don't have any experience doing what you're trying. You are going to low-pass filter the signal somewhere in your design. And, I'm a little worried the output current source is not going to be as linear as you'd like driving such a low resistance.
Audio Applications Engineering Manager
Dallas, TX USA
Thanks for the quick answer.
pp 55 of the datasheet points to the schematic of figure 36. That one shows a couple I/V converters with the 5534. Those I/V converters are meant to present a virtual ground node to the PCM1794 / PCM1796, and as such, 0 volts and (theoretical) zero ohms.
May be that you meant that the existence of voltage other than zero would make the current source less linear ?
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