Hi, folks
I'll be driving car's head unit through it's CD changer input, so not sure what load is it. Maybe there is a standard for this?
Is it possible to use op-amp with PCM5102A? In my application the load is much lower than 10k, so as a result I have much lower Vrms than it's defined in the datasheet (2.1V). So maybe it's possible to use op-amp or should I use a different DAC chip for this application then?
Anyone have ideas of it? Thank you in advance!
I'll be driving car's head unit through it's CD changer input, so not sure what load is it. Maybe there is a standard for this?
Is it possible to use op-amp with PCM5102A? In my application the load is much lower than 10k, so as a result I have much lower Vrms than it's defined in the datasheet (2.1V). So maybe it's possible to use op-amp or should I use a different DAC chip for this application then?
Anyone have ideas of it? Thank you in advance!
It is not clear what you are trying to achieve tbh 🙂
So an unknown...
Where has this figure come from then?
Any common audio type opamp will drive 600 ohms load. If you need an opamp somewhere for more voltage drive then you have to consider your supply voltage and whether you need to go down a single or dual supply route.
2.1Vrms is already 6 volts peak to peak. If your supply is only 12 volts then realistically you are only looking at being able to get around 9v or 10v peak to peak (about 3.4 vrms) which subjectively would not make much difference to levels.
So an unknown...
Where has this figure come from then?
Any common audio type opamp will drive 600 ohms load. If you need an opamp somewhere for more voltage drive then you have to consider your supply voltage and whether you need to go down a single or dual supply route.
2.1Vrms is already 6 volts peak to peak. If your supply is only 12 volts then realistically you are only looking at being able to get around 9v or 10v peak to peak (about 3.4 vrms) which subjectively would not make much difference to levels.
Actually many opamps can't drive 600 ohms without beginning to distort, 2k is the "standard" output load for opamps. Many audio opamps are 600 ohms capable, but only the datasheet will be definitive.
But certainly buffering the outputs with opamp followers is a wise step - many opamps can drive capacitive loads through 100 ohms or so, so you can reduce the output impedance to 100 ohms easily this way and as a bonus the opamps will act as some protection for the DAC - make them socketed. You'll need +/-5V supplies or so and reasonably rail-to-rail opamps to do this.
But certainly buffering the outputs with opamp followers is a wise step - many opamps can drive capacitive loads through 100 ohms or so, so you can reduce the output impedance to 100 ohms easily this way and as a bonus the opamps will act as some protection for the DAC - make them socketed. You'll need +/-5V supplies or so and reasonably rail-to-rail opamps to do this.