- As mentioned before it is explained in section 5.5 of the datasheet: it is recommended to leave 1 ohm pin floating or shorted to GND to set the two channels mode configuration, or to short 1 ohm pin to VCC to set the one channel configuration. So if you only use IN2 and want to have the two channels connected in parallel = single channel, you have to switch the pin to VCC, but this also requires paralleling OUT1 and OUT2.
- CD_OUT is an open drain output and would need a pull up if used. Since you don't want to use it, you don't need a pull-up and therefore also no voltage V. Otherwise, V would be the voltage, which is typically 3.3V or 5V depending on the connected logic.
- See datasheet, table 4: Vm: Mute pin voltage for play mode = 3.5-18V
- Standard Bridge mode: classical class AB amp, High Efficiency mode = The dissipated output power under average listening condition is in fact reduced up to 50% when compared to the level provided by conventional class AB solutions. (description of the datasheet)
- The type of the input caps depends on your requirements: ceramic caps are typically MLCCs and, due to the piezo effect, could be sensitive to external sound or hard impacts. Polyester ones would be an alternative, but ecaps should also be sufficient.
- A tone control must be implemented in front of the input of the amplifier and depends very much on the application: for a subwoofer, for example, you normally do not need to control frequencies above 100Hz. Otherwise you can use everything here: from a passive shelving filter with two potentiometers and a few resistore/capacitors to a graphics equalizer.
Good luck!
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/Peter
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