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AD7538TQ Folha de dados(PDF) 8 Page - Analog Devices

Nome de Peças AD7538TQ
Descrição Electrónicos  LC2MOS uP-Compatible 14-Bit DAC
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AD7538TQ Folha de dados(HTML) 8 Page - Analog Devices

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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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