At what supply voltage op amps die ?

[Bernhard]

Hi,

because of a wrong regulator board in one of my analyzers, all op amps, BB DAC80 and ADC chips were running on +21/-19V for 15 minutes or so and everything still works.

[jean-paul]

You'll have to put a higher voltage on them to find out because they still live

[matjans]

if you run a sine wave through them, measure the output with a scope and turn up the voltage you'll start to see horrible distortions at some point (before they die, that is).

But then again, sometimes opamps do sound better (in my experience) when you turn up the voltage. Glue a small copper heatsink onto them with heat-transferring glue and they can stand much higher voltages.

[HFGuy]

Sorry to be a jerk but this kinda question is why datasheets are created. OP-AMP datahsheets will always have a maximum supply voltage

[rbroer]

Hmmmm,

My opamps are running at +/- 45V
But haven't failed yet

They're BB opamps as well (445),
quite robust ones Bernard

[bocka]

Stresses above those listed under “Absolute Maximum Ratings” MAY cause permanent damage to the device. Exposure to absolute maximum conditions for extended periods may affect device reliability.

The DAC80 is rated to +/-18V. If you exceeded this ratings the DAC may work correctly or not. No one can say this if you haven't measured all specs in the datasheet. Sometimes a degration and not a failure of the part occur if you exceed the absolute maximum ratings.

My opamps are running at +/- 45V

This is inside the absolute maximum ratings

DESCRIPTION: The OPA445 is a monolithic operational amplifier capable of operation from power supplies up to ±45V and output currents of 15mA

[triode_al]

Originally posted by Bernhard
Hi,

because of a wrong regulator board in one of my analyzers, all op amps, BB DAC80 and ADC chips were running on +21/-19V for 15 minutes or so and everything still works.

Bernard,
I found some (6) BB DAC chips. In a dump. (Jean Paul: in Vlaardingen)
Now, the question is, how can I use the D/A in a way that gives more than 12 bit sound ?
Do you have a suggestion for me?
Evidently I need a fan-out for each bit; and once I have that, it should be possible to go to 16 bits (don't need more than that, really).
hope for some input!
albert

[Bernhard]

If it is current out model, you could add fine adjustable current sources for the 4 MSBs ?

[triode_al]

Originally posted by Bernhard
If it is current out model, you could add fine adjustable current sources for the 4 MSBs ?

I have the voltage out model. DAC80-CBI-V. Datestamp 8107.
So probablyI need an I/V conversion and a summing buffer in between.

There have also been plans for a discrete DAC. I wonder how that worked out and how this fits in.
albert

[neutron7]

it seems rather like op amps "+ - 18 volts" being all the same is a bit odd. some could probably go over by quite a bit. it might be "fun" for someone to do experiment and find out the real max voltage of various good opamps