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Part Number: PCM5102A
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?
Hi Lukas, Of course you can use an op amp buffer on the output. The selection of the op amp will be dependent on the load. If you are planning on driving speakers or a headphone output, then you can take a look at our TPAxxxx devices. If you are driving a intermediate load or high impedance headphones, you can consider the OPA1622. Thanks, Paul
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In reply to Paul_Frost:
In reply to Lukas Sidlauskas:
I am not aware of a CD input standard, but you might check the head unit manual. I would expect it to be pretty high impedance, so the PCM5102A would be able to drive it directly. You mentioned that your output is attenuated, how much? If you look at the output of the PCM without plugging it into the head unit, is it what your expect?
Could you please provide a reference design? Because everything I found on your web page is for differential outputs only.
Here is a diagram I put together. Note that you should use thin film resistors and C0G/NP0 ceramics for the passive components. The amplifier could be a device like the OPA1622 if you are expecting a high current load, or a device like the the OPA1678 if you just need a simple buffer.
Many thanks for this diagram! I find it very helpful! Btw, can this be directly connected to OUTL and OUTR of PCM5102A? Or I should still leave 470R resistor and 2.2nF cap at the output of PCM5102A before op-amp? Another question is what would be the easiest way to power this op-amp?
Kevin DukeDAC Applications Manager
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