Decoding ADC pin labels
To answer the specific question about triggering the ADC: If you're not using it with a microprocessor of some sort, you could simply tie the CS- and RD- lines low, which will permanently enable the parallel data outputs, and then pulse the WR- line low to initiate each conversion.

You'll get a pulse on the INTR- output when the conversion is complete. (Note that it won't latch as long as CS- and RD- are tied low.)