NJW1128 - NJR Corporation

NJW1128 Voice Switched Speakerphone Circuit

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 sp.

Features

q q q q q q q q q Operating voltage range Attenuator gain range between Transmit and Receive 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 q Speaker switch Pin power down the speaker amplifier q Microphone and Receive Amplifiers pinned out for flexibility q Package Outline C8 R4 100n 3k R5 300 k C9 10 0n R6 5.1k R7 5 .1k C1 0 100n C11 R 8 100n 5 .1k 3.9 to 5.5V 52dB LQFP48-R3 R9 51.