[sdiy] uA726 transistor array

[Ian Fritz]

At 05:56 PM 10/13/2002, jhaible wrote:

>Depends on which temperature you're heating the chip.
>
>Generally, higher temperature means the chip will be aging faster,
>have more leakage and so on.

All true. But I believe leakage is generally described by the exponential 
prefactor, and the differential design should (in principle) cancel it out.

>BUT any decent chip should be specified for a temp range of
>0 deg C to 70 deg C at least, so I question the "unusable" statement
>if you heat it to 50 or 55 deg for instance.
>Maybe the app engineer had much higher temperatures in mind
>when you talked about heating?

I believe a higher temperature will allow a tighter control loop (faster 
cooling rate) and this might be important if the dielectric isolation is 
significantly impeding the heat flow.

   Ian