Current Sources and Voltage References

Enhancing the voltage reference design

An Introduction to Voltage References

349

als involved, such as the housing of the trimmer, will survive the 150˚C temperature.)

The burn-in process tends to stabilize the various drifts and improve the long-term sta-

bility. Once this is done you should measure again, and if necessary readjust the refer-

ence at 25˚C and at the two operating temperature extremes. After that, no further

adjustment should be necessary.

For devices that have

no

built-in trim capability, one must use an op amp circuit to

make any output adjustment or use some form of compensation circuit. One can eas-

ily scale and amplify the ref ...