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NJW1128 Datasheet دیتاشیت PDF دانلود

دیتاشیت - NJR Corporation - Voice Switched Speakerphone Circuit

شماره قطعه NJW1128
شرح مفصل Voice Switched Speakerphone Circuit
تولید کننده NJR Corporation 
آرم NJR Corporation 


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NJW1128 شرح
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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.
! APPLICATION
Video Door Phone
Conference System
Wireless Application
Security System
NJW1128FR3
! FEATURES
q Operating voltage range
q Attenuator gain range between Transmit and Receive
q Speaker amplifier
q Microphone amplifier with mute function
q Force to Receive, Transmit, or Idle modes
q Mode –watching monitor
q Background noise monitor for each path
q 4-point signal sensing
q 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
3.9 to 5.5V
52dB
LQFP48-R3
! BLOCK DIAGRAM
C8 R4
100n 3k
M ic rophone
M ICIN
R5
300 k
C9
10 0n
R6
5.1k
MICOUT TLI2
C1 0 C11 R 8
100n 100n 5 .1k
R9
51k
R7
5 .1k
TLI1 TXO
Cf L
L II LiO-
L iO+
MUT
V+ :MU TE
GND :AC TIVE
V+ R2
3 00k
C2
1µ
C5
1 00n
C6
100n
C4
1u
M UT
TL O2
RL O2
CPT
VR EF
M ic
Am plifier
Tx Atten uato r
Level
D et ect or
B a ckground
Noi seMon itor
At t enuat or
Control
VR EF
-1
L ine Am plifi er
Backgrou nd
No iseM onitor
Line Out
SPV+
SPV+
V+
V+
C 22
1µ
C 12
1µ
Monit or
C7
C T 1µ
V+
RTSW
C PR
C21
1µ
V+ :Reciv e
GND :Trensm it
Open :idle
CD
V+ :AC TIVE
GND :Power Down
C20
1µ
C1
VREF
1µ CD
R3
V+ C3 300 k
1µ SPS
SPSW
V+ :ACTIVE
GN D :Powe r Down
V+
R3
300 k
B IAS
L evel
Detector
Speaker Ampl ifier
-1
V RE F
Rx Attenuator
1.2µA
Receiv e
Am pli fier
SPO+
S PO -
CfS
R10
51 k
SPI RXO RL I2
R11 C 13 C1 4
5.1k 10 0n 100n
R 12
5.1k
VL C
R 13
5.1k
RVL C
R LI1
C15
100n
FO
R14
5.1k
CfR
T LO1
RLO1
C20
100 n
C 19
100 n
SPGN D
GND
V RE F
FI
R 15
5. 1k
C 16
100n
Recive In
Spea ke r
Ver.1.2 – 1 –

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