PCM1794 output circuit

mb939

Other Parts Discussed in Thread: PCM5242, PCM5102A

Hi!

I would like to use this DAC because of high performance, but I don't want to use dual supply for the OPAMPs. I tried to separate the DC component with a big ceramic cap, and the another input of the opamp is connected to half supply (2.5V). I included the schematic below. I use the dac only for audio purposes so I don't need DC component. This circuit will work? I dont know the inner structure of the DAC so I don't know there are a better solution.

Thanks,

Balint

over 10 years ago

0 Converter Apps over 10 years ago

TI__Mastermind 28585 points

Hi,

I have asked my colleague to take a look.

Best Regards.

dave

0 Pavel Ruzicka over 10 years ago

Expert 1720 points

It is not a good idea, because you will degrade quality of this DAC. If you want high quality DAC without negative power supply, that you can use a new DAC PCM5242 with differential output. If single-ended line-out is enough for you that you can use PCM5102A which has internal charge pump for negative voltage and line-out without need of DC block capacitor.

Pavel

0 mb939 over 10 years ago in reply to Pavel Ruzicka

Prodigy 30 points

Thank you for your help. I choose the 2 supply mode because I need good quality,

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PCM1794 output circuit