Preheat oven to 350°. Stir together first 3 ingredients in a small bowl until well blended. Press mixture onto bottom of a greased and floured 9-inch springform pan. Stand 17 vanilla wafers around edge of pan (rounded sides against pan), pressing gently into crust to secure. Bake 10 minutes. Cool completely on a wire rack (about 30 minutes).
Combine bananas and lemon juice in a small saucepan. Stir in brown sugar. Cook over medium-high heat, stirring constantly, 1 minute or just until sugar has dissolved.
Beat cream cheese at medium speed with an electric mixer 3 minutes or until smooth. Gradually add granulated sugar, beating until blended. Add eggs, 1 at a time, beating just until yellow disappears after each addition. Beat in vanilla. Gently stir banana mixture into cream cheese mixture. Pour batter into prepared crust.
Bake at 350° for 45 to 55 minutes or until center is almost set. Remove cheesecake from oven; gently run a knife around edge of cheesecake to loosen. Sprinkle top of cheesecake with coarsely crushed wafers. Cool completely on a wire rack (about 1 hour). Cover and chill 8 hours.