NJM2772
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LOW-VOLTAGE HE ADPHONE AMPLIFIER for PORTABLE-AUD IO
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■ GENERAL DESC RIPTION ■
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■ PACKAGE OUTLINE
The NJM2772 is a low voltage headphone amplifier for
portable au dio.
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 au dio system with he adphone amp l ifier.
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■ FEATURES
● Operating Voltage V+=1.8-4.5V
● Operating Current 1.2mA typ. @Center A mp. Off
2.0mA typ. @Center Amp. O n
● Low St andby Current 18µA ty p.
● High Output Power 6mWmin. @RL=16Ω, THD=10%
● Fixed Gain 11.5dB typ.
● Pac kage Outl ine SSOP1 4
● Bipolar Techn ology
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■ PIN CON FI GU RATIO N & BLO CK DIAGRA M
1
2
3
4
14
13
12
11
OUTA
OUTC
10
PA-A
5
6
7
9
STBY
8
Vref
INA
MuteTC
V+
GND
Vref
+
+
INB
BEEP
OUTB
DNC
PA-C
PA-B
MUTE
CenterSW
Note)DNC(14pin):Do not connect
NJM2772V
Pin Function
1.STBY
2.INA
3.CenterSW
4.VREF
5. BEEP
6.INB
7.MUTE
8.MuteTC
9.OUTB
10.GND
11.OUTC
12. V+
13.OUTA
14.DNC
NJM2772
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■ ABSO L UT E MA XI MUM RATING S (Ta=25°C)
PARAMETER SYMBOL RATINGS UNIT
Supply Vo ltage V+5V
Power Dissipation PD (SSOP14) 300 mW
Operating Temperature Range Topr -20 to +75 °C
Storage Temperature Range Tstg -40 to +125 °C
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■ RECOMMENDED OPERATING CONDITIIONS (Ta=25°C)
PARAMETER SYMBOL MIN. TYP. MAX. UNIT
Operatin g Voltage Ra nge V+1.8 2.3 4.5 V
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■ ELE CTRI CAL CHA RA CTERI STICS
(V+=2.3V,Rg=600Ω,RL=16Ω,f=1kHz,STBY-OFF,MUTE-OFF,CA-ON,Ta=25°C)
PARAM ET E R SYM BOL TEST CO NDI TI O N MIN. TYP. MAX . UNIT
ICC1 STANDBY-ON,MUTE-ON - 18 26 µA
ICC2 No signal, C A-O FF - 1.2 2.0 mA
ICC3 No signal - 2.0 4.0 mA
ICC4P
O=0.5mW+0.5mW,CA-OFF - 5.8 - mA
ICC5P
O=0.5mW+0.5mW - 11.7 - mA
Icc6 PO=0.1mW+0.1mW,CA-OFF - 3.0 - mA
Operating Current
ICC7P
O=0.1mW+0.1mW - 5.9 - mA
Reference Voltage VREF No signal 0.70 0.75 0.80 V
Voltage Gain GVVIN=-30dBV 10.5 11.5 12.5 dB
PO1 THD=10% 6.0 8.0 -
Output Power PO2V
+1=1.8V,THD=10% 3.0 4.0 - mW
Total Harmonic Distortion THD VIN=-30dBV - 0.1 0.5 %
Output Noise Voltage VNO A-Weighted - -98
(12.6) -94
(20) dBV
(µVrms)
Closs-talk CT VIN=-30dBV,Vo=-18.5dBV - -40 -24 dB
Mute Level MUTE MUTE-ON,VIN=-30dBV,A-Weighted - -95 -80 dBV
Beep Output Voltage VBEEP BEEP-IN=2Vpp -55 -50 -45 dBV
Supply Voltage Rejection
Ratio SVR V+=1.8V+0.1Vrms:1kHz 65 70 - dB
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■ CONT RO L TER MI NA L CHARA CTERI STI C S
PARAM ET E R SYMBO L TEST CO NDI TI O N MIN. TYP. MAX. UNIT
H Level In put Voltage VIH STBY(1Pin),CSW(3Pin),MUTE(7Pin) 0.8 - V+V
L Level Input Voltage VIL STBY(1Pin),CSW(3Pin),MUTE(7Pin) 0 - 0.3 V
H Level In put Voltage VBH BEEP(5Pin) 0.8 - V+V
L Level Input Voltage VBL BEEP(5Pin) 0 - 0.3 V
NJM2772
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■ CONT RO L TER MI NA L EXPLANTION
♦STBY ( 1Pin)
PARAMETER CONTROL
SIGNAL STATUS
STANDBY ON L IC is standby.
STANDBY OFF H IC is active.
♦Center-SW (3Pin)
PARAMETER CONTROL
SIGNAL STATUS
Center A mp. O N L Cent er Amp. is activ e.
Can operate o utput coupling capacitor less.
Center A mp. O FF H When output coupling capacitor is used, realize low current con-
sumption to be Center Amp. O FF.
♦MUTE (7Pin)
PARAMETER CONTROL
SIGNAL STATUS
MUTE O N H IC output no sign al.
MUTE OFF L IC output the signa l.
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■ APPLICATION CIRCUIT
1) Center Amp. On Mode
1
2
3
4
14
13
12
11
OUTA
OUTC
10
PA-A
5
6
7
9
STBY
8
Vref
INA 0.47uF
16Ω
MuteTC
0.47uF
V+
0.1uF
16Ω
STBY OFF
STBY ON
GND
Vref 47uF
+
+
INB 0.47uF
BEEP
OUTB
DNC
PA-C
PA-B
MUTE ON
MUTE OF F MUTE
CenterSW
Cent er OFF
Cent er ON
NJM2772
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■ APPLICATION CIRCUIT
2) Center Amp. Off Mode
1
2
3
4
14
13
12
11
OUTA
10
PA-A
5
6
7
9
STBY
8
Vref
INA 0.47uF
16Ω
MuteTC
0.47uF
V+
0.1uF
16Ω
STBY OFF
STBY ON
GND
Vref 47uF
+
+
INB 0.47uF
BEEP
OUTB
DNC
PA-C
PA-B
MUTE ON
MUTE OF F MUTE
CenterSW
Cent er OFF
Cent er ON
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.
