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AD7538JN Datasheet(PDF) 8 Page - Analog Devices |
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AD7538JN Datasheet(HTML) 8 Page - Analog Devices |
8 / 8 page AD7538 REV. A –8– AD7538-MC68000 INTERFACE Figure 10 shows the MC68000 processor interface to a single device. In this setup the double buffering feature of the DAC is not used and the appropriate data is written into the DAC in one MOVE instruction. Figure 10. AD7538-MC68000 Interface DIGITAL FEEDTHROUGH The digital inputs to the AD7538 are directly connected to the microprocessor bus in the preceding interface configurations. These 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. To 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. Figure 11. AD7538 Interface Circuit Using Latches to Minimize Digital Feedthrough OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 24-Pin Plastic Suffix (N) 24-Pin Cerdip (Suffix Q) |
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