MC2502 View Datasheet(PDF) - PMD
Part Name
Description
MFG CO.
'MC2502' PDF : 51 Pages View PDF
6.5 12-bit A/D Interface
The following schematic shows a typical interface circuit between the Navigator chipset and a quad
12 bit 2’s complement A/D converter used as a position input device.
Comments on Schematic
The A/D converter samples all 4 axes and sequentially converts and stores the 2’s complement
digital words. The data is read out sequentially, axis 1 to 4. DACRD- is used to perform the read
and is also used to load the counter to FFh. The counter will be reloaded for each read and will not
count significantly between reads. The counter will therefore start counting down after the last read
and will generate the cvt- pulse after 12.75 µsec. The conversions will take approximately 35 µsec,
and the data will be available for the next set of reads after 50 µsec. The 12 bit words from the A/D
are extended to 16 bits with the 74LS244.
MC2502 Technical Specifications
44
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