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Applying buried-zener references
can add more references, but the limiting factor is that the maximum load current is
not exceeded. Each reference uses the TRIM capability to precisely set its output volt-
age. Depending on the loads, each output may require bypassing. If long traces are
involved, then several op amp/buffers could be added, to provide Kelvin connections
that compensate for stray resistances and deliver the same exact reference voltage to
the load.
Another exceptional buried-zener part is the REF102 from Texas Instruments. The
REF102 was originally designed by Burr-Brown several years ago and is now part of
Texas Instruments’ Analog/P ...