Austin Seferian-Jenkins just cut a deal with prosecutors to put an end to his DUI case ... and TMZ Sports has learned he'll now have to complete probation and more to get his charges officially dropped.
ASJ -- a 28-year-old former Buccaneers, Jets and Jaguars tight end -- was pulled over in Gig Harbor, Wash. on March 9 at around 1 AM after cops say they saw him doing 48 MPH in a 30.
In police documents, obtained by TMZ Sports, cops say ASJ was also swerving in his 2016 Dodge Charger .