■ GENERAL DESCRIPTION
The NJW1128 is a Voice Switched Speakerphone Circuit. It includes all of functions processing a high quality hands–free 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.

■ FEATURES
● Operating voltage range                                                 3.9 to 5.5V
● Attenuator gain range between Transmit and Receive   52dB
● Speaker amplifier
● Microphone amplifier with mute function
● Force to Receive, Transmit, or Idle modes
● Mode –watching monitor
● Background noise monitor for each path
● 4-point signal sensing
● Chip disable Pin powers down the entire IC excluding the speaker amplifier
● Speaker switch Pin power down the speaker amplifier
● Microphone and Receive Amplifiers pinned out for flexibility
● Package Outline                                                               LQFP48-R3

■ APPLICATION
• Video Door Phone
• Conference System
• Wireless Application
• Security System