NJW1124V-TE1 Nisshinbo

NJW1124 Voice Switched Speakerphone circuit GENERAL DESCRIPTION PACKAGE OUTLINE The NJW1124 is a Voice Switched Speakerphone Circuit. NJW1124 includes all of functions processing a high quality handsfree 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. NJW1124V APPLICATION Video Door Phone Conference System Wireless Application Security System FEATURES Operating voltage range 2.9 to 4.5V Force to Receive, Transmit, or Idle modes Mode watching 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 BLOCK DIAGRAM C8 C9 C6 R2 R3 C7 R6 R7 100n 100n 100n 5.1k 51k 100n 5.1k 51k Microphone Line Out R4 R5 C10 51k 10k MCO MCI TLI2 TLI1 TXO LII LiO- LiO+ + V R1 + V 300k C11 Tx Attenuator -1 1 + Mic VREF V VREF Amplifier Line Amplifier C1 1 Monitor MUT C3 C5 Level 470n 1 CT TLO2 Detector + C4 V 470n RLO2 RTSW C2 Background Attenuator Background C22 1u NoiseMonitor Control NoiseMonitor CPR 1 CPT C20 Level 470n TLO1 Detector C21 470n RLO1 C23 1 BIAS VREF Receive IC1 Amplifier NJW1124 VREF2 Rx Attenuator GND VREF 1.2 A VLC RLI1 FO FI RXO RLI2 R12 5.0V R10 + V C18 51k R13 R14 C19 15k R11 100n C16 5.1k 5.1k 100n R + VLC C17 10k Recive In 100n C15 10 C13 1 1111 Speaker IC2 C14 1 1 1 1 NJU7084 R9 R8 C12 Power Amplifier 22k 11k 100n 1 NJW1124 PIN CONFIGURATION 1 32 2 31 3 30 4 29 5 28 6 27 7 26 8 25 9 24 10 23 11 22 12 21 13 20 14 19 15 18 16 17 1 VREF2 32 MON 2 MUT 31 RTSW 3 NC 30 VREF 4 CPT 29 CPR 5 TLO2 28 RLO1 6 RLO2 27 TLO1 7 CT 26 VLC 8 MCI 25 FI 9 MCO 24 FO 10 TLI2 23 RLI1 11 TLI1 22 RLI2 12 TXO 21 RXO 13 LII 20 NC 14 LIO- 19 NC 15 LIO+ 18 NC 16 GND 17 V+ 2 NJW1124