The NJW1128 is a Voice Switched Speakerphone Circuit. It includes all of functions processing a high quality handsfree speakerphone system, such as the necessary amplifiers ( Mic , Receive ,Line, Speaker ), attenuators, level detectors functions. The NJW1128 is controllable independently power-down of the speaker amplifier and the entire IC excluding the speaker amplifier. All external capacitors are sufficient small so that ceramic capacitors are applied.