NJW1128

NJW1128 www.DataSheet4U.com Voice Switched Speakerphone Circuit with Speaker Amplifier ! 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. ! PACKAGE OUTLINE NJW1128FR3 ! APPLICATION Video Door Phone Conference System Wireless Application Security System ! 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 51k ! BLOCK DIAGRAM Microphone Cf L TXO L II LiOL iO+ SPV + SPV + V+ V+ L ine Am plifi er Line Out M ICIN MUT V+ GND MICOUT TLI2 TLI1 :MU TE :A C TIVE C2 1µ C5 100n C6 100n C4 1u C20 1µ C1 ...