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Old 16th January 2019, 01:20 AM   #51
mige0 is offline mige0  Austria
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Also my subjective feeling is that channel separation isn't all that great as could be expected from specs. Would possibly gain further from a split PS arrangement.
Crap
Those INA1620EVM boards suck.

Its not that the channel separation of the chip is bad, its the crappy SMD (C1 - C4) capacitors that degrade common mode rejection to an unacceptable degree.
Not enough, once removed the somehow technical presentation further improves considerably towards enjoyable musicality, telling, that those capacitors were not only way off in tolerance but also severely degrading sonics by their make.

C5, C6 rail decoupling, same crap.
Best to also trash them and just place Nichicon bipolars 100uF or so at the power IN (superior to the 1000uF FC).

Also removed my input capacitors for best CMRR in a previous step.

Not quite there yet, but already way better.
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Last edited by mige0; 16th January 2019 at 01:49 AM.
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Old 16th January 2019, 02:14 AM   #52
weissi is offline weissi  Austria
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Yeah, C1-C4 also left me wondering given that TI states the INA part has some kind of EMI filter already integrated in the chip itself. Instead of removing C5,C6 i opted to scratch off the paint an add a few more 2u2/50v X7R and very important to add a cross cap vom +Ve to -Ve. But still I haven't listened that much to that board.
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Old 16th January 2019, 07:10 AM   #53
mige0 is offline mige0  Austria
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Yes, in the data sheet of the INA1620 / OPA1622 they state, that they match the four resistors to 0.004% at best which translates for the 1k at hand to a max. tolerance value of 40 mOhm.

Any degradation beyond that degrades the speced CMRR, and its sonic outcome is even worse, when its not constant over frequency.
They certainly could and should have done better. At the very least they have had to provide an in depth explanation of the stock circuitry on the EVM board, discussing such gross design flaws

@johnc124 schau oba!

Last edited by mige0; 16th January 2019 at 07:25 AM.
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Old 16th January 2019, 07:32 AM   #54
weissi is offline weissi  Austria
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So, what upsampling chip is used there? Probably a SRC4392 or a AK4136 ... That would be a inserting point for an external USB interface.
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Old 16th January 2019, 08:37 AM   #55
mige0 is offline mige0  Austria
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Originally Posted by weissi View Post
Instead of removing C5,C6 i opted to scratch off the paint an add a few more 2u2/50v X7R and very important to add a cross cap vom +Ve to -Ve.
I found the original rail caps to degrade musicality, hence I removed them.
On the other hand, I use silver MICA (at the bottom of the board) in parallel to the suggested bipolar Nichicon.


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So, what upsampling chip is used there? Probably a SRC4392 or a AK4136 ... That would be a inserting point for an external USB interface.
PCM1795, after TINA, IMO no way to add external USB interface
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Old 16th January 2019, 08:48 AM   #56
weissi is offline weissi  Austria
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I've seen it in the last picture, must be a Cirrus Logic CS8421.

Edit: CS8422

not the best kid in town...
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Last edited by weissi; 16th January 2019 at 08:50 AM.
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Old 16th January 2019, 10:17 AM   #57
mige0 is offline mige0  Austria
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Yes, thats the one.
CS8422 | Cirrus Logic
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