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This two-part article discusses the use of operational amplifiers in applications involving both digital and analog signals. In some cases the digital signals are used to control the acquisition of samples of analog signals. In other applications the digital signal is being converted into an analog voltage or, conversely, an analog is converted to a series of digital words. This first installment is concerned with multiplexer, D/A converter, and A/D converter circuits. Part II, scheduled to appear in the June issue, will be devoted to sample/hold modules, peak detectors, and comparators.