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PCM1798 to PCM1794 swap
PCM1798 to PCM1794 swap
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Old 21st September 2019, 09:30 PM   #1
cbarth is offline cbarth  Norway
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Default PCM1798 to PCM1794 swap

Hi,
I'm at a crossroad of which way to pursue for upgrading my digital front end.
The plan was to tweak my vintage dac some more, but now I'm leaning towards trying out modifing my cdp instead. It uses a single PCM1798 chip. I thinking of transformercouple the output. Ivan's (bisesik) transformers looks tempting.
Now the PCM1798 have 4mA output and the PCM1794 have 7,8mA output.
As far as I can see the pins match each other. Would a swap be possible or even benefitial?
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Old 21st September 2019, 09:44 PM   #2
analog_sa is offline analog_sa  Europe
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PCM1798 to PCM1794 swap
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Would a swap be possible or even benefitial?

Yes to both.
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Old 21st September 2019, 09:54 PM   #3
cbarth is offline cbarth  Norway
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Yes to both.
Great, thank's!
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Old 21st September 2019, 10:05 PM   #4
Ken Newton is offline Ken Newton  United States
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I’ve alternately had both DAC chips in an DAC board of my own design. I can’t say that could hear any distinction between them. The PCM1794A costs a few dollars more, but they are indeed pin swappable.
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Old 21st September 2019, 10:17 PM   #5
cbarth is offline cbarth  Norway
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Ok, but wouldn't the higher current capability of the 1794 be benefitial for a passive transformer output? Or would the 4mA on the 1798 be satisfactory?
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Old 21st September 2019, 10:45 PM   #6
analog_sa is offline analog_sa  Europe
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PCM1798 to PCM1794 swap
It's been at least 10 years but i have distinct memories of enjoying the 1794 a bit more.

Not sure what the voltage compliance level of these chips was, as this sets the maximum value of the current conversion resistor. I think this was in the DS but perhaps someone with more recent memories can help you more.
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Old 21st September 2019, 10:58 PM   #7
cbarth is offline cbarth  Norway
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Ok, thanks. At Mouser there is a PCM1794adb and PCM1794adbr. Are they both compatible?
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Old 22nd September 2019, 11:17 AM   #8
cbarth is offline cbarth  Norway
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Ivan was concerned about the DC offset on the 1798. He had tried his transformer with succes on the 1792. Does anybody know if this different on 1794A?
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Old 22nd September 2019, 12:00 PM   #9
Ken Newton is offline Ken Newton  United States
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Originally Posted by cbarth View Post
Ok, thanks. At Mouser there is a PCM1794adb and PCM1794adbr. Are they both compatible?
They are exactly the same. Those suffix letters refer to the form in which they are delivered. The ADB is delivered in a plastic tube or stick. The ADBR is delivered in 2,000 unit Tape & Reel form. Although, the ADBR is also available in single units as, "cut tape".
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Old 22nd September 2019, 07:47 PM   #10
cbarth is offline cbarth  Norway
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Ok, transformers and chip ordered. This will be a fun little project.
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