adc1225ccd-1 National Semiconductor Corporation, adc1225ccd-1 Datasheet - Page 12

• Manufacturer Part Number: adc1225ccd-1
• Description: 12-bit Plus Sign Mp Compatible A/d Converters
• Manufacturer: National Semiconductor Corporation

Functional Description
When using this method of conversion only one strobe is
necessary and the rising edge of WR RD can be used to
read the current conversion results These methods reduce
the throughput time of the conversion since the RD and WR
cycles are combined
2 With the standard timing WR pulse width longer than the
conversion time a conversion is completed but the INTR will
never go low to signal the end of a conversion The output
latches will be updated and valid information will be avail-
able when the RD cycle is accomplished
(Continued)
FIGURE 13
FIGURE 14
12
3 Tying CS and RD low continuously and strobing WR to
initiate a conversion will also yield valid data The INTR will
never go low to signal the end of a conversion and the
digital outputs will always be enabled so using INTR to
strobe the WR line for a continuous conversion cannot be
done with this part
A simple stand-alone circuit can be accomplished by driving
WR with the inverse of the READY OUT signal using a sim-
ple inverter as shown below
TL H 5676 – 29
TL H 5676 – 28
TL H 5676 – 30