  We have developed a FX-architecture digital spectro-correlator, Atacama
Compact Array Correlator for the Atacama Large Millimeter/submillimeter Array.
The ACA Correlator processes four pairs of dual polarization signals, whose
bandwidth is 2 GHz, from up to sixteen antennas, and calculates auto- and
cross-correlation spectra including cross-polarization in all combinations of
sixteen antennas. We report the detailed design of the correlator and the
verification results of the correlator hardware.
