[sdiy] 2164 overvoltage condition?

[Neil Johnson]

Hi

Sean Ellis wrote:
> I've been breadboarding a filter and oscillator using a single 2164 and I
> think I just fried my only 2164 on hand. I have the power supply protected
> but accidentally put -12 straight into the input of one amp (the control pin
> was at about 2.5V) and suddenly it died. The datasheet specifies the max
> ratings to the supply rails so I don't get why it could have (seemingly)
> destroyed the chip. Could it maybe have caused excessive heat?

Well, according to the AbsMax ratings of both the original SSM2164 and
CoolAudio/Behringer clone V2164 you *should* have been ok for at least
a short time - until any heating effect caused the device to overheat
and die.  You don't say how exactly it died so I can't say for sure.

The input pin is a current summing node, the internal connections are
to the base of an NPN transistor and one current output of the gain
cell.

It could be that you had some other connection bad as well?

Neil
-- 
http://www.njohnson.co.uk