NJM2171A
LOW VOLTAGE HEADPHONE AMPLIFIER for PORTABLE AUDIO
s
GENERAL DESCRIPTION
The
NJM2171A
is a low voltage headphone amplifier
designed for portable audio items.
The
NJM2171A
operates directly for battery supply. It
includes mute and standby circuit which require few external
components and realize low current consumption and very low
turn-noise at standby mode.
It is suitable for portable Mini-Disc, portable Compact-Disc,
and other headphone amplifier application.
s
PACKAGE OUTLINE
NJM2171AR
s
FEATURES
q
Operating Voltage
V 1=1.8 to 4.5V
+
V 2=0.9 to 4.5V
+
q
Operating Current
450µA typ. @V 1=2.3V
+
700µA typ. @V 2=1.2V
q
Supply Current in Power Down Mode
+
10µA typ. @V 1=2.3V
+
25µA typ. @V 2=1.2V
@THD=10%
q
Output Power Exceeds 5mW
R
L
=16Ω
q
Fixed Voltage Gain
11.5dB typ.
q
Package Outline
VSP10
q
Bipolar Technology
+
s
PIN CONFIGURATION
1
2
3
4
5
MUTE
BIAS
AMP1
AMP2
10
9
8
7
6
PIN FUNCTION
+
1.V 2
2.OUT1
3.IN1
4.STBY
+
5.V 1
6.V
REF
7.MUTE
8.IN2
9.OUT2
10.GND
NJM2171A
s
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
+
Supply Voltage
V
Power Dissipation
P
D
Operating Temperature Range
Topr
Storage Temperature Range
Tstg
RATINGS
5
(VSP8) 320
-20 to +75
-40 to +125
(Ta=25°C)
UNIT
V
mW
°C
°C
s
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
MIN.
+
Operating Voltage Range1
V1
1.8
+
Operating Voltage Range2
V2
0.9
TYP.
2.3
1.2
MAX.
4.5
4.5
(Ta=25°C)
UNIT
V
V
s
ELECTRICAL CHARACTERISTICS
(V 1=2.3V,V 2=1.2V,Rg=600Ω,R
L
=16Ω,f=1kHz,Ta=25°C)
PARAMEETER
SYMBOL
TEST CONDITION
MIN.
TYP.
+
I
CC
0
V 1=0V(1pin)
-
-
I
CC
1
STANDBY ON,MUTE ON(1pin)
-
25
I
CC
2
STANDBY ON,MUTE ON(5pin)
-
10
Operating Current
I
CC
3
No signal(1pin)
-
700
I
CC
4
No signal(5pin)
-
450
I
CC
5
P
O
=0.5mW+0.5mW(1pin)
-
5.5
I
CC
6
P
O
=0.5mW+0.5mW(5pin)
-
0.8
Reference Voltage
V
REF
No signal
0.55
0.60
Closed Loop Gain
G
V
V
IN
=-30dBV
10.5
11.5
P
O
1
THD=10%
5.0
8.5
Output Power
+
+
V 1=1.8V,V 2=0.9V,THD=10%
2.0
4.0
P
O
2
-
0.15
THD1
Po=1mW,R
L
=16Ω
Total Harmonic Distortion
-
0.4
TED2
Po=5mW,R
L
=16Ω
Output Noise Voltage
V
NO
A-Weighted
-
-100
Crosstalk
CT
V
IN
=-30dBV
-
-80
Mute Level
MUTE
MUTE-ON,V
IN
=-30dBV,A-Weighted
-
-95
+
+
V 1=1.8V+0.1Vrms, V 2=0.9V
60
70
Supply Voltage Rejection SVR1
+
+
Ratio
SVR2
V 1=1.8V, V 2=0.9V+0.1Vrms
60
70
+
+
MAX.
1
40
15
1200
700
-
-
0.65
12.5
-
-
0.3
0.6
-96
-70
-80
-
-
UNIT
µA
mA
V
dB
mW
%
dBV
dBV
dBV
dB
NJM2171A
s
CONTROL TERMINAL CHARACTERISTICS
PARAMETER
SYMBOL
TEST CONDITION
High Level Input Voltage
V
IH
STBY(4pin), MUTE(7pin)
Low Level Input Voltage
V
IL
STBY(4pin), MUTE(7pin)
MIN.
1.2
0
TYP.
-
-
MAX.
+
V1
0.3
UNIT
V
V
s
CONTROL TERMINAL EXPLANATION
•STBY
(4Pin)
PARAMETER
CONTROL SIGNAL
STANDBY ON
H
IC is non-active.
STANDBY OFF
L
IC is active.
•MUTE
(7Pin)
PARAMETER
MUTE ON
MUTE OFF
STATUS
CONTROL SIGNAL
STATUS
H
IC doesn’t output the signal.
L
IC output the signal.
s
APPLICATION CIRCUIT
V
+
2
22µF
330µF
OUT1
16Ω
0.47µF
IN1
STBY ON
STBY OFF
1
2
3
100kΩ
1µF
AMP1
AMP2
10
330µF
9
16Ω
0.47µF
OUT2
8
100kΩ
IN2
MUTE ON
MUTE OFF
4
5
MUTE
BIAS
7
6
1µF
V
+
1
22µF
22µF
[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.
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