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Designated client product
This product will be discontinued its pr oduction in the near term.
And it is provided for customers current ly in use only, with a time limit.
It can not be available for your new project. Please select other new or
existing product s.
For more information, please cont act our sales office in your region.
New Japan Radio Co.,Ltd.
NJM2772
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LOW-VOLTAGE HEADPHONE AMPLIFIER for PORTABLE-AUDIO
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■ GENERAL DESCRI PTI ON ■
■■
■ PA CKAGE 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 syste m with headphone ampl ifier.
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■ FEATURES
● Operating Voltage V+=1.8-4.5V
● Operating Current 1.2mA t yp. @Center A mp. Off
2.0mA typ. @Center Amp. O n
● Low St andby Curre nt 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 & BLOCK 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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■
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■ ABSO L UT E MA XI MUM RATING S (Ta=25°C)
PARAMETER SYMBOL RATINGS UNIT
Supply Voltage V+5V
Power Dissipation PD (SSOP14) 300 mW
Operating Temperature Range Topr -20 to +75 °C
Storage Te mp erat ure 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 RACTERISTI CS
(V+=2.3V,Rg=600Ω,RL=16Ω,f=1kHz,STBY-OFF,MUTE-OFF,CA-ON,Ta=25°C)
PARAM ET ER SYMBO L TEST CO NDI TI O N MIN. TYP. M AX. UNIT
ICC1 STANDBY-ON,MUTE-ON - 18 26 µA
ICC2 No signal, CA-OFF - 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 G VVIN=-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 CTE RISTICS
PARAM ET ER 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 Voltag e 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 Voltag e VBL BEEP(5Pin) 0 - 0.3 V
NJM2772
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■
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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 Center A mp. is activ e.
Can operate o utput coupl ing capacitor less.
Center A mp. O FF H When output coupling capacitor is used, realize low current con-
sumption to be Center Am p. O FF.
♦MUTE (7Pin)
PARAMETER CONTROL
SIGNAL STATUS
MUTE O N H IC output no signal.
MUTE OFF L IC output t he signal.
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■ APPLICATION CIRCUIT
1) Center A m p. O n 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 OFF MUTE
CenterSW
Cent er OFF
Cent er ON
NJM2772
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■
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■ APPLICATION CIRCUIT
2) Center A m p. O ff 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 OFF 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.
