NJM2772
LOW-VOLTAGE HEADPHONE AMPLIFIER for PORTABLE-AUDIO
s
GENERAL DESCRIPTION
The
NJM2772
is a low voltage headphone amplifier for
portable audio.
The
NJM2772
includes mute circuit, center amplifier and
beep input, reduce the external parts, standby circuit and
center amplifier with ON/OFF, applies to low current
consumption. The mute function reduces the turn-noise at
standby mode.
The NJM2772 is suitable for portable MD, CD, and others
portable audio system with headphone amplifier.
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FEATURES
q
Operating Voltage
q
Operating Current
q
Low Standby Current
q
High Output Power
q
Fixed Gain
q
Package Outline
q
Bipolar Technology
s
PACKAGE OUTLINE
NJM2772V
V
+
=1.8-4.5V
1.2mA typ. @Center Amp. Off
2.0mA typ. @Center Amp. On
18µA typ.
6mWmin. @R
L
=16Ω, THD=10%
11.5dB typ.
SSOP14
s
PIN CONFIGURATION & BLOCK DIAGRAM
STBY 1
INA 2
CenterSW 3
Vref 4
BEEP 5
INB 6
MUTE 7
+
PA-B
14 DNC
+
PA-A
13 OUTA
12 V
+
Vref
PA-C
11 OUTC
10 GND
9 OUTB
8 MuteTC
Pin Function
1.STBY
2.INA
3.CenterSW
4.V
REF
5. BEEP
6.INB
7.MUTE
8.MuteTC
9.OUTB
10.GND
11.OUTC
12. V
+
13.OUTA
14.DNC
Note)DNC(14pin):Do not connect
-1-
NJM2772
s
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Supply Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
V
+
P
D
Topr
Tstg
RATINGS
5
(SSOP14) 300
-20 to +75
-40 to +125
(Ta=25°C)
UNIT
V
mW
°C
°C
s
RECOMMENDED OPERATING CONDITIIONS
PARAMETER
SYMBOL MIN.
TYP.
Operating Voltage Range
V
+
1.8
2.3
(Ta=25°C)
MAX. UNIT
4.5
V
s
ELECTRICAL CHARACTERISTICS
(V
+
=2.3V,Rg=600Ω,R
L
=16Ω,f=1kHz,STBY-OFF,MUTE-OFF,CA-ON,Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
MIN.
I
CC
1
I
CC
2
I
CC
3
I
CC
4
I
CC
5
Icc6
I
CC
7
V
REF
G
V
P
O
1
P
O
2
V
NO
CT
MUTE
V
BEEP
SVR
STANDBY-ON,MUTE-ON
No signal, CA-OFF
No signal
P
O
=0.5mW+0.5mW,CA-OFF
P
O
=0.5mW+0.5mW
P
O
=0.1mW+0.1mW,CA-OFF
P
O
=0.1mW+0.1mW
No signal
V
IN
=-30dBV
THD=10%
V
+
1=1.8V,THD=10%
V
IN
=-30dBV
A-Weighted
V
IN
=-30dBV,Vo=-18.5dBV
MUTE-ON,V
IN
=-30dBV,A-Weighted
BEEP-IN=2Vpp
V
+
=1.8V+0.1Vrms:1kHz
-
-
-
-
-
-
-
0.70
10.5
6.0
3.0
-
-
-
-
-55
65
TYP.
18
1.2
2.0
5.8
11.7
3.0
5.9
0.75
11.5
8.0
4.0
0.1
-98
(12.6)
-40
-95
-50
70
MAX.
26
2.0
4.0
-
-
-
-
0.80
12.5
-
-
0.5
-94
(20)
-24
-80
-45
-
UNIT
µA
mA
mA
mA
mA
mA
mA
V
dB
mW
%
dBV
(µVrms)
dB
dBV
dBV
dB
Operating Current
Reference Voltage
Voltage Gain
Output Power
Total Harmonic Distortion THD
Output Noise Voltage
Closs-talk
Mute Level
Beep Output Voltage
Supply Voltage Rejection
Ratio
s
CONTROL TERMINAL CHARACTERISTICS
PARAMETER
SYMBOL
TEST CONDITION
H Level Input Voltage V
IH
STBY(1Pin),CSW(3Pin),MUTE(7Pin)
L Level Input Voltage V
IL
STBY(1Pin),CSW(3Pin),MUTE(7Pin)
H Level Input Voltage V
BH
BEEP(5Pin)
L Level Input Voltage V
BL
BEEP(5Pin)
MIN.
0.8
0
0.8
0
TYP.
-
-
-
-
MAX.
V
+
0.3
V
+
0.3
UNIT
V
V
V
V
-2-
NJM2772
s
CONTROL TERMINAL EXPLANTION
♦STBY
(1Pin)
CONTROL
PARAMETER
SIGNAL
STANDBY ON
L
IC is standby.
STANDBY OFF
H
IC is active.
♦Center-SW
(3Pin)
PARAMETER
Center Amp. ON
Center Amp. OFF
♦MUTE
(7Pin)
PARAMETER
MUTE ON
MUTE OFF
CONTROL
SIGNAL
H
IC output no signal.
L
IC output the signal.
STATUS
CONTROL
SIGNAL
L
H
STATUS
Center Amp. is active.
Can operate output coupling capacitor less.
When output coupling capacitor is used, realize low current con-
sumption to be Center Amp. OFF.
STATUS
s
APPLICATION CIRCUIT
1) Center Amp. On Mode
STBY OFF
STBY ON
STBY
0.47uF
1
2
+
PA-A
14 DNC
13
16Ω
INA
Center OFF
Center ON
OUTA
V
+
CenterSW
3
4
5
Vref
PA-C
12
0.1uF
47uF
Vref
BEEP
0.47uF
11
OUTC
GND
10
16Ω
INB
MUTE ON
MUTE OFF
6
MUTE
7
+
PA-B
9
0.47uF
OUTB
MuteTC
8
-3-
NJM2772
s
APPLICATION CIRCUIT
2) Center Amp. Off Mode
STBY OFF
STBY ON
STBY
0.47uF
1
2
+
PA-A
14 DNC
13
12
0.1uF
INA
Center OFF
Center ON
16Ω
OUTA
V
+
CenterSW
3
4
5
Vref
PA-C
47uF
Vref
BEEP
0.47uF
11
10
GND
OUTB
16Ω
INB
MUTE ON
MUTE OFF
6
MUTE
7
+
PA-B
9
8
MuteTC
0.47uF
Note) When the BEEP terminal (5pin) is useless, short to GND.
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
-4-
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