NJRC NJM2171AR

NJM2171A
LOW VOLTAGE HEADPHONE AMPLIFIER for PORTABLE AUDIO
■ 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.
■ FEATURES
● Operating Voltage
■ PACKAGE OUTLINE
NJM2171AR
+
V 1=1.8 to 4.5V
+
V 2=0.9 to 4.5V
+
● Operating Current
450µA typ. @V 1=2.3V
+
700µA typ. @V 2=1.2V
● Supply Current in Power Down Mode
+
10µA typ. @V 1=2.3V
+
25µA typ. @V 2=1.2V
@THD=10%
● Output Power Exceeds 5mW
RL=16Ω
● Fixed Voltage Gain
11.5dB typ.
● Package Outline
VSP10
● Bipolar Technology
■ PIN CONFIGURATION
1
2
10
AMP1
AMP2
8
3
4
5
9
MUTE
BIAS
7
6
PIN FUNCTION
+
1.V 2
2.OUT1
3.IN1
4.STBY
+
5.V 1
6.VREF
7.MUTE
8.IN2
9.OUT2
10.GND
NJM2171A
■ ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
+
Supply Voltage
V
Power Dissipation
PD
Operating Temperature Range
Topr
Storage Temperature Range
Tstg
RATINGS
5
(VSP8) 320
-20 to +75
-40 to +125
■ 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
mW
°C
°C
(Ta=25°C)
UNIT
V
V
+
■ ELECTRICAL CHARACTERISTICS (V 1=2.3V,V 2=1.2V,Rg=600Ω,RL=16Ω,f=1kHz,Ta=25°C)
PARAMEETER
SYMBOL
TEST CONDITION
MIN.
TYP.
+
ICC0
V 1=0V(1pin)
ICC1
STANDBY ON,MUTE ON(1pin)
25
ICC2
STANDBY ON,MUTE ON(5pin)
10
Operating Current
ICC3
No signal(1pin)
700
ICC4
No signal(5pin)
450
ICC5
PO=0.5mW+0.5mW(1pin)
5.5
ICC6
PO=0.5mW+0.5mW(5pin)
0.8
Reference Voltage
VREF
No signal
0.55
0.60
Closed Loop Gain
GV
VIN=-30dBV
10.5
11.5
PO1
THD=10%
5.0
8.5
Output Power
+
+
V 1=1.8V,V 2=0.9V,THD=10%
2.0
4.0
PO2
0.15
THD1
Po=1mW,RL=16Ω
Total Harmonic Distortion
0.4
TED2
Po=5mW,RL=16Ω
Output Noise Voltage
VNO
A-Weighted
-100
Crosstalk
CT
VIN=-30dBV
-80
Mute Level
MUTE
MUTE-ON,VIN=-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
■ CONTROL TERMINAL CHARACTERISTICS
PARAMETER
SYMBOL
TEST CONDITION
High Level Input Voltage
VIH
STBY(4pin), MUTE(7pin)
Low Level Input Voltage
VIL
STBY(4pin), MUTE(7pin)
■ 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
MIN.
1.2
0
TYP.
-
MAX.
+
V1
0.3
UNIT
V
V
STATUS
CONTROL SIGNAL
STATUS
H
IC doesn’t output the signal.
L
IC output the signal.
■ APPLICATION CIRCUIT
10
1
V+2
22µF
330µF
330µF
2
OUT1
16Ω
AMP1
AMP2
STBY OFF
V+1
100kΩ
4
MUTE
1µF
5
22µF
16Ω
8
3
STBY ON
OUT2
0.47µF
0.47µF
IN1
9
BIAS
7
IN2
100kΩ
MUTE ON
1µF
MUTE OFF
6
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.