Prescalar – Postscalar Open-loop and Closed-loop Settings

1. Prescalar – Postscalar Open-loop and Closed-loop Settings TI Information – Selective Disclosure

2. WHY PRES-SCALAR – POST-SCALAR • What is it? • Pre-scalar has digital headroom of +24dB without clipping • Post-scalar can be adjusted to the desire distortion for increased power over the full scale input. • What is it for? • By increasing the input signal over the full scale (clipped signal) in the pre-scalar block and then adjusting the output the desired distortion in the post-scalar block: • The distortion level is independent of PVCC • The distortion level is also maintained in post-scalar block, i.e. in a certain range the post-scalar block can be adjusted so that the output amplitude changes but the distortion level stays constant TI Information – Selective Disclosure

3. Closed-loop TAS5710 Prescalar: 0x57 00AB AAAA Postscalar: 0x56 0002 3333 Input: 13 VDC, full scale digital Load: 8 Ohm Output: 8W, 10% THD+N 15kHz – 8W – 10% THD+N 1kHz – 8W – 10% THD+N TI Information – Selective Disclosure

4. Open-loop TAS5709 Prescalar: 0x57 002B 0000 Postscalar: 0x56 0006 B000 Input: 13 VDC, full scale digital Load: 8 Ohm Output: 8W, 10% THD+N 15kHz – 8W – 10% THD+N 1kHz – 8W – 10% THD+N TI Information – Selective Disclosure

5. TI Information – Selective Disclosure