Protection diodes on DSD/PCM-1792/94 current-outputs?

Der Dude · 6th August 2005, 02:41 AM

Hi all,

does anybody know if there are protection diodes on the current-outputs
of the DSD/PCM-1792/94-DACs like in the PCM-1702/04-family?

Might be a nice information, when playing around
with non-OP I/V-stages.

Regards.

Guido Tent · 6th August 2005, 11:24 AM

Quote:

Originally posted by Der Dude
Hi all,

does anybody know if there are protection diodes on the current-outputs
of the DSD/PCM-1792/94-DACs like in the PCM-1702/04-family?

Might be a nice information, when playing around
with non-OP I/V-stages.

Regards.

Hi,

No clue. Asking the manufacturer won't help, they never responded to any of my Emails. We'd possible have to measure it.

kevinkr · 8th August 2005, 04:50 PM

Probably doesn't matter.. Depending on the internal architecture of the dac monotonicity suffers badly if there is more than a few mV of signal present on the current outputs of the dacs. Any I/V converter should probably keep that point within a mV of ac ground anyway.

Kevin

Guido Tent · 8th August 2005, 05:49 PM

Quote:

Originally posted by kevinkr
Probably doesn't matter.. Depending on the internal architecture of the dac monotonicity suffers badly if there is more than a few mV of signal present on the current outputs of the dacs. Any I/V converter should probably keep that point within a mV of ac ground anyway.

Kevin

Hi

Yes, this requires < 1 ohm transfer impedance. The output of most "current output" DACs isn't that high, e.g PCM63 is 700 ohm.

cheers

ONTech · 30th January 2009, 12:25 PM

I have used the DSD 1792 similar to PCM 1792 and with open output it goes close to 5V so it seems like there is no protection.
I have used it with a 47ohm resistor on the output without any problems. As i remember it there is a offset of the current so it goes between 2 and 10 mA where 6mA is zero.

Kind regards

Ole

6th August 2005, 02:41 AM	#1
Der Dude diyAudio Member Join Date: Dec 2004 Location: -	Protection diodes on DSD/PCM-1792/94 current-outputs? Hi all, does anybody know if there are protection diodes on the current-outputs of the DSD/PCM-1792/94-DACs like in the PCM-1702/04-family? Might be a nice information, when playing around with non-OP I/V-stages. Regards.

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8th August 2005, 04:50 PM	#3
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	Probably doesn't matter.. Depending on the internal architecture of the dac monotonicity suffers badly if there is more than a few mV of signal present on the current outputs of the dacs. Any I/V converter should probably keep that point within a mV of ac ground anyway. Kevin

30th January 2009, 12:25 PM	#5
ONTech diyAudio Member Join Date: May 2006	I have used the DSD 1792 similar to PCM 1792 and with open output it goes close to 5V so it seems like there is no protection. I have used it with a 47ohm resistor on the output without any problems. As i remember it there is a offset of the current so it goes between 2 and 10 mA where 6mA is zero. Kind regards Ole