Driving ADC/DAC Reference Inputs
Walt Jung and Walt Kester
It might seem odd to include a section on voltage references in a book devoted primarily to op amp applications, but the relevance will shortly become obvious. Unfortunately, there is little standardization with respect to ADC/DAC voltage references. Some ADCs and DACs have internal references, while others do not. In some cases, the dc accuracy of a converter with an internal reference can often be improved by overriding the internal reference with a more accurate and stable external one.
Although the reference element itself can be either a bandgap, buried zener, or XFETTM (see Reference 1), practically all references have some type of output buffer op amp. The op amp ...
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