I am interfacing PCM5100A audio DAC which is 2.1 Vrms (Ground Center), Stereo line output load (1K ohm, nominal 10K ohm) to a mixer stage audio channel that is 500 ohm input.
I am using only a single output (mono) channel from the DAC and the DAC output is connected, per its application note, to a 470 ohm resistor and 2.2nF cap (RC).
Having only basic knowledge with impedance matching; Does the 470 ohm resistor in series with the DAC output increase the input impedance to near 1k? Hence, testing this in practice is working without attenuation.
Or should I consider adding a simple op-amp; not to amplify the signal, but to lower the output impedance? Any advice on the op-amp and its schematics is highly appreciated.
Thanks
Ned
I am using only a single output (mono) channel from the DAC and the DAC output is connected, per its application note, to a 470 ohm resistor and 2.2nF cap (RC).
Having only basic knowledge with impedance matching; Does the 470 ohm resistor in series with the DAC output increase the input impedance to near 1k? Hence, testing this in practice is working without attenuation.
Or should I consider adding a simple op-amp; not to amplify the signal, but to lower the output impedance? Any advice on the op-amp and its schematics is highly appreciated.
Thanks
Ned