NJU72341
2 Channels Electronic Volume
GENERAL
DESCRIPTION
The NJU72341 is a 2 channels I C electronic volume IC with
external mute controls.
The NJU72341 has many characteristics that are useful in audio
application, such as low noise, low distortion, and wide operating
voltage range.
All functions are controlled by I C BUS interface.
2
2
PACKAGE
OUTLINE
SSOP14
FEATURES
Operating Voltage
Input Gain
Volume
Low Distortion
Low Noise
External Mute
Zero Cross Detection
I
2
C BUS Control
CMOS Technology
Small Package
V
+
=4.5V
14.5V
0dB/+3dB/+6dB/+9dB
0~-95dB/Mute ,1dBstep
0.002% typ.
2.0µVrms typ.
SSOP14
BLOCK
DIAGRAM
PIN CONFIGURATION
No.
1
2
3
OUT1
Symbol
NC
NC
IN1
IN2
MUTE
SDA
SCL
V+
VREF
GND
OUT2
OUT1
NC
NC
Function
-
-
Input Terminal 1
Input Terminal 2
Mute Terminal
I
2
C Data Input Terminal
/Acknowledge Output
I
2
C Clock Terminal
Power Supply Terminal
Reference Voltage
Terminal
Ground Terminal
Output Terminal 2
Output Terminal 1
-
-
IN1
4
5
IN2
OUT2
6
7
MUTE
SDA
SCL
I
2
C
Vref
8
9
10
11
12
13
14
Zero Cross
Detection
Ver.0.8E
–
1
–
NJU72341
ABSOLUTE
MAXIMUM RATING
(Ta=25C)
PARAMETER
Supply Voltage
Power Dissipation
Maximum Input Voltage
Operating Temperature Range
Storage Temperature Range
SYMBOL
V
+
P
D
V
IMAX
Topr
Tstg
RATING
+15
450 (Note1)
0
~
V
+
(Note2)
-40
~
+85
-40
~
+125
UNIT
V
mW
V
C
C
(Note1) EIA/JEDEC STANDARD Test board (76.2x114.3x1.6mm, 2layer, FR-4) mounting
(Note2) Don’t put Input Voltage more than Power Supply Voltage.
ELECTRICAL
CHARACTERISTICS
(Ta=25C, V =9V, R
L
=47k, V
IN
=1.5Vrms, f=1kHz, all controls flat unless otherwise specified)
+
PARAMETER
Operating Voltage
Supply Current
Reference Voltage
Maximum Input Voltage
Maximum Output Voltage
Voltage Gain 1
Voltage Gain 2
Voltage Gain 3
Channel Balance
Total Harmonic Distortion
Output Noise Voltage
Channel Separation
SYMBOL
V
+
TEST CONDITION
MIN.
4.5
TYP.
9
5.5
4.5
3.6
2.6
6
0
-106
0
0.002
2.0
-110
MAX.
14.5
9
5.0
-
-
8
1.5
-95
1
0.01
7.0
-90
UNIT
V
mA
V
Vrms
Vrms
dB
dB
dB
dB
%
μVrms
dB
I
DD
V
REF
V
INS
V
OM
G
V1
G
V2
G
V3
G
CB
THD
V
NO
CS
No signal
No signal
Main Volume=-6dB,THD=1%
THD=1%
Input Gain=+6dB, V
IN
=100mVrms
-
4.0
-
2.2
4
-1.5
Main Volume=Mute,
BW=400Hz-30kHz
Main Volume=0dB
Vo=1.5Vrms,BW=400Hz~30kHz
Main Volume=0dB
R
g
=0
-
-1
-
-
-
MUTE TERMINAL CONTROL CHARACTERISTICS
(Ta=25C, all controls flat unless otherwise specified)
PARAMETER
Low Level Input Voltage
High Level Input Voltage
SYMBOL
V
IL
V
IH
TEST CONDITION
MIN.
0
2.0
TYP.
-
-
MAX.
0.6
V
+
UNIT
V
V
CONTROL
TERMINAL EXPLANATION
–Mute
Terminal-
(Ta=25C, V =9V, R
L
=47k, V
IN
=1.5Vrms, f=1kHz, all controls flat unless otherwise specified)
+
MODE
Mute ON
Mute OFF
STATUS
H
L
TEST CONDITION
Mute is Active
Mute is NOT Active
–
2
–
NJU72341
TERMINAL
DESCRIPTION
Terminal
SYMBOL
FUNCTION
EQUIVALENT CIRCUIT
V+
VOLTAGE
3
4
IN1
IN2
3kΩ
AC Input
48kΩ
V
REF
V /2
+
Internal VDD
5
MUTE
MUTE Control
20kΩ
100kΩ
0V
V+
6
SDA
I C Data Input
/Acknowledge
Output
2
26.7Ω
20kΩ
-
ACK
V+
7
SCL
I C Clock Input
2
20kΩ
-
–
3
–
NJU72341
TERMINAL
DESCRIPTION
Terminal
SYMBOL
FUNCTION
EQUIVALENT CIRCUIT
VOLTAGE
V+
8
V+
Supply Voltage
V
+
V+
300Ω
9
VREF
Reference Voltage
175kΩ
175kΩ
V /2
+
V+
11
12
OUT2
OUT1
AC Output
40Ω
V /2
20kΩ
V
REF
+
–
4
–
NJU72341
TEST
CIRCUIT
I
DD
/ V
REF
V
INS
/ V
OM
/ G
V1
/ G
V2
/ G
V3
/ G
CB
/ THD
NC
NC
NC
NC
1
14
1
14
NC
NC
NC
NC
2
13
2
13
IN1
2.2uF
OUT1
IN1
2.2uF
OUT1
3
12
3
12
2.2uF
R
L
=47kΩ
IN2
2.2uF
OUT2
IN2
2.2uF
OUT2
V
4
11
4
11
2.2uF
R
L
=47kΩ
MUTE
GND
MUTE
GND
V
5
Zero Cross
Detection
Vref
10
5
Zero Cross
Detection
Vref
10
SDA
VREF
SDA
VREF
10uF
6
IC
SCL
2
9
10uF
V
+
6
V
V
+
9
V
+
10uF
A
I
2
C
SCL
V
+
7
Bias
8
10uF
7
Bias
8
V
NO
CS
NC
NC
NC
NC
1
14
1
14
NC
NC
NC
NC
2
13
2
13
IN1
2.2uF
OUT1
IN1
2.2uF
2.2uF
OUT1
3
12
3
12
2.2uF
R
L
=47kΩ
IN2
2.2uF
OUT2
V
IN2
R
L
=47kΩ
OUT2
V
4
11
2.2uF
2.2uF
4
11
2.2uF
R
L
=47kΩ
MUTE
GND
V
MUTE
R
L
=47kΩ
GND
V
5
Zero Cross
Detection
Vref
10
5
Zero Cross
Detection
Vref
10
SDA
VREF
10uF
SDA
VREF
10uF
6
I
2
C
SCL
9
V
+
10uF
6
I
2
C
SCL
9
V
+
10uF
V
+
V
+
7
Bias
8
7
Bias
8
–
5
–
