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microprocessor bus in the preceding interface configurations. T hese inputs will be constantly changing even when the device is not selected. The high frequency logic activity on the bus can feed through the DAC package capacitance to show up as noise on the analog output. T o minimize this Digital Feedthrough isolate the DAC from the noise source. Figure 11 shows an in- terface circuit which uses this technique. All data inputs are latched from the bus by the CS signal. One may also use other means, such as peripheral interface devices, to reduce the Digi- tal Feedthrough.
