In this application, the device is able to use both digital and analog inputs, working in mono output by summing left and right analog inputs and output from DAC and routing this signal into the speaker output.

The internal LDO is not used in this application becasuse the LDO_SEL pin is tied to GND. External 1.8-V supply is used to power AVDD and DVDD. IOVDD can be supplied by voltages between 1.1 V and 3.6 V which lets the system to use conventional 1.8-V or 3.3-V supplies. The SPKVDD can be connected to voltages between 2.7 V and 5.5 V, although it is usually supplied by a 5-V voltage.

Decoupling capacitors should be used at all the supply lines. TI recommends using 0.1-µF, 10-µF, and 22-µF capacitors for a better system performance.

Decoupling series capacitors must be used at the analog input.

All grounds are tied together; route analog and digital paths are separated to avoid interference.