GENERAL DESCRIPTION

The NJW1124 is a Voice Switched Speakerphone Circuit. NJW1124 includes all of functions processing a high quality handsñfree speakerphone system, such as the necessary amplifiers ( Microphone , Receive ,Line), attenuators, level detectors functions. All external capacitors are sufficient small so that ceramic capacitors are applied.

FEATURES

• Operating voltage range 2.9 to 4.5V

• Force to Receive, Transmit, or Idle modes

• Mode ñwatching monitor

• Attenuator gain range between Transmit and Receive 52dB

• Microphone amplifier with mute function

• Background noise monitor for each path

• Volume control range 40dB

• 4-point signal sensing

• Microphone and Receive Amplifiers pinned out for flexibility

• Package Outline SSOP32

APPLICATION

•Video Door Phone

•Conference System

•Wireless Application

•Security System