TAS5103 can be set up for BTL AD modulation with 1N inputs using the Mode pins, with M2 set low and M1 set high. (See page 2 of the data sheet.) In this mode, 1N signals are applied to PWM_A to produce BTL output between OUT_A and OUT_B and to PWM_C to produce BTL output between OUT_C and OUT_D.
PWM_B and PWM_D have internal pulldown resistors, so they can be left floating.