In 2007, Davis was hired by the Arizona Cardinals as their linebackers coach under head coach Ken Whisenhunt. In 2008, the Cardinals advanced to Super Bowl XLIII but ended up losing to the Steelers 23–27. In 2009, Davis was promoted to defensive coordinator. His unit allowed 325 points, the 5th lowest total of the franchise since the NFL went to a 16 game schedule in 1978. The Cardinals also has 21 interceptions during the regular season, the team's highest total since 1994. Arizona's defense finished 6th in the NFL with 43 sacks, the 3rd highest total since 1983. Safety, Adrian Wilson, DT Darnell Dockett, S Antrel Rolle and CB Dominque Rodgers-Cromartie were all selected to the Pro Bowl for that season. In 2009 the Arizona Cardinals lost lost in the Divisional round to the New Orleans Saints who went on to win the Super Bowl.