Hello
I'm wondering if someone could point me to some proper documentation on doing an active balanced output filter for the CS42448 chip.
The datasheet only gives me circuits for a single-ended output, passive and active.
There is a circuit that takes the balanced output of the chip and gives a single ended output but that's not what i need.
The output impedance of the DAC is 100 ohms according to the datasheet.
The datasheet also says that there is an inbuilt 0.5*Fs lowpass filter built into the chip but they also reccomend that a filter is to be used to further reduce noise above the audio passband.
I've found balanced filters from other DAC chips but they normally have waaay lower output impedances, so the filter cutoff would probably change.
Here's the two circuits that the CS42448 datasheet gives me.
I'm wondering if someone could point me to some proper documentation on doing an active balanced output filter for the CS42448 chip.
The datasheet only gives me circuits for a single-ended output, passive and active.
There is a circuit that takes the balanced output of the chip and gives a single ended output but that's not what i need.
The output impedance of the DAC is 100 ohms according to the datasheet.
The datasheet also says that there is an inbuilt 0.5*Fs lowpass filter built into the chip but they also reccomend that a filter is to be used to further reduce noise above the audio passband.
I've found balanced filters from other DAC chips but they normally have waaay lower output impedances, so the filter cutoff would probably change.
Here's the two circuits that the CS42448 datasheet gives me.