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NJW1128 PDF预览

NJW1128

更新时间: 2024-11-18 06:00:59
品牌 Logo 应用领域
NJRC 放大器
页数 文件大小 规格书
13页 252K
描述
Voice Switched Speakerphone Circuit with Speaker Amplifier

NJW1128 数据手册

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NJW1128  
Voice Switched Speakerphone Circuit  
with Speaker Amplifier  
! GENERAL DESCRIPTION  
! PACKAGE OUTLINE  
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.  
NJW1128FR3  
! APPLICATION  
Video Door Phone  
Conference System  
Wireless Application  
Security System  
! FEATURES  
Operating voltage range  
Attenuator gain range between Transmit and Receive  
Speaker amplifier  
3.9 to 5.5V  
52dB  
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  
Speaker switch Pin power down the speaker amplifier  
Microphone and Receive Amplifiers pinned out for flexibility  
Package Outline  
LQFP48-R3  
! BLOCK DIAGRAM  
C10 C11  
100n 100n 5.1k  
C8 R4  
100n 3k  
R5  
300k  
C9  
10 0n  
R8  
R9  
51k  
Microphone  
Line Out  
R6  
5.1k  
R7  
5.1k  
CfL  
MICOUT  
M ICIN  
TLI2  
TLI1 TXO  
LII  
LiO-  
LiO+  
SPV+  
C22  
1
µ
MUT  
V+  
GND :ACTIVE  
R2  
3 00k  
SPV+  
V+  
V+  
:MUTE  
C12  
1
µ
Tx Atten uato r  
-1  
M ic  
VREF  
V+  
VREF  
Am plif ier  
L ine Amplifier  
C2  
1
Monitor  
CT  
µ
M UT  
C5  
100n  
C6  
C7  
1
µ
V+  
:Recive  
Level  
Detector  
TLO2  
RL O2  
GND :Trensmit  
Open :idle  
V+  
100n  
RTSW  
CPR  
C4  
1u  
Background  
Attenuator  
Control  
Backgrou nd  
No iseM onitor  
C21  
1
µ
NoiseMon itor  
CPT  
C20  
100 n  
C20  
L evel  
1
µ
TLO1  
RLO1  
BIAS  
Detector  
VREF  
CD  
C19  
100 n  
C1  
1
µ
CD  
Speaker Ampl ifier  
V+ :ACTIVE  
GND :Power Down  
R3  
300 k  
Receiv e  
Ampli fier  
SPGND  
GND  
C3  
V+  
1
µ
SPS  
Rx Attenuator  
-1  
VREF  
FI  
VREF  
1.2  
A
µ
SPSW  
V+ :ACTIVE  
GND :Power Down  
V+  
R3  
300 k  
RLI1  
FO  
SPO+  
SPO-  
CfS  
SPI  
RL I2  
VLC  
RX O  
R13  
5.1k  
C16  
C15  
R15  
5. 1k  
R14  
5.1 k  
R12  
5.1k  
10 0n  
100n  
RVLC  
Recive In  
R10  
51 k  
R11 C13 C14  
5.1k 10 0n 100n  
CfR  
Speaker  
Ver.1.4  
– 1 –  

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