TPA3223 is designed to accept either a differential or a single-ended audio input signal. To accept a wide range of system front ends TPA3223 has selectable input gain that allows full scale output with a wide range of input signal levels.

Best system noise performance is obtained with balanced audio interface. However, in systems with only a single ended audio input signal available, one input terminal can be connected to AC ground to accept single ended audio input signals.

Figure 9-3 Balanced Audio Input Configuration

In systems with single ended audio inputs, set the device gain higher than for systems with balanced audio input signals.

Figure 9-4 Single Ended Audio Input Configuration