NJW1128 Series
Voice Switched Speakerphone Circuit with Speaker Amplifier

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  • Description

    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.


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

  • Spec
    Supply Voltage 3.9V to 5.5V
    Structure Bi-CMOS Technology
    Wide Operating Temperature -40℃ to +85℃
    Junction Temp. +125℃
    Package LQFP48-R3
    Attenuator gain range between Transmit and Receive 52dB
    Note Speaker amplifier
    Microphone amplifier with mute function
    Force to Receive, Transmit, or Idle modes
    Mode-watching monitor
    Background noise monitor for each path
    Speaker switch Pin power down the speaker amplifier
    4-point signal sensing
    Chip disable Pin powers down the entire IC excluding
    Microphone and Receive Amplifiers pinned out for flexibility
  • Technical
  • Quality &
    • Refer to the datasheets for the details on the product.
    • The package file or the datasheet includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.

Download Datasheet

Functional Description

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