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NJM2173A
LOW VOLTAGE MICROPHONE AMPLIFIER for PORTABLE AUDIO
s
GENERAL DESCRIPTION
The
NJM2173
is a low voltage microphone amplifier designed
for portable audio items.
It includes standby, two-type gain selector, and power ripple
rejection adjustment circuit. It realizes very low turn-noise at
standby mode.
It is suitable for portable Mini-Disc, portable Compact-Disc, and
other microphone amplifier application.
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FEATURES
q
Operating Voltage Range
2.7 to 4.5V
+
q
Operating Current
2.2mA typ. at V =2.7V
q
Supply Current in Standby Mode
1µA max.
q
Maximum Output Voltage
-1.5dBV typ. at THD=0.1%
q
Internal Two-type Gain Select Function 13dB typ./ 29dB typ.
q
Internal Standby Function
q
Power Ripple Rejection Terminal
95dB typ. at Gv=13dB
q
Bipolar Technology
q
Package Outline
SSOP14
s
PIN CONFIGURATION
1
2
3
4
5
6
7
14
13
12
11
10
9
8
s
PACKAGE OUTLINE
NJM2173V
PIN FUNCTION
+
1. OUT 1
8. V
9. STBY
2. DC CUT 1
10. Gv
3. IN 1
+
+
11. MIC V 2
4. MIC V 1
5. REG
12. IN 2
6. NOISE
13. DC CUT 2
7. GND
14. OUT 2
NJM2173V
s
BLOCK DIAGRAM
OUT1 1
AMP1
AMP2
14 O U T 2
13 D C C U T2
12 IN 2
11 M IC V
+
2
Gv
REG
DC CUT1 2
IN 1 3
M IC V
+
1 4
REG 5
N O IS E 6
GND 7
10 G v
9 STBY
8 V
+
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ABSOLUTE MAXIMUM RATINGS
(Ta=25°C)
PARAMETER
SYMBOL
+
Supply Voltage
V
Maximum Input Voltage
V
IN
Power Dissipation
P
D
Operating Temperature Range
Topr
Storage Temperature Range
Tstg
RATINGS
5
(3,12pin) -0.3 to V
REG
+0.3
300
-20 to +75
-40 to +125
NJM2173A
UNIT
V
V
mW
°C
°C
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ELECRRICAL CHARACTERISTICS
( V =2.7V, Gv=13dB, V
IN
=-40dBV, R
L
=9kΩ, f=1kHz, Ta=25°C)
PARAMETER
Operating Voltage Range
Operating Current 1
Operating Current 2
Output Voltage
Voltage Gain 1
Voltage Gain 2
Maximum Output Voltage
Total Harmonic Distortion
SYMBOL
V
+
+
TEST CONDITION
Standby On:STBY= V
G
V
=29dB,No Signal,Standby Off
:STBY=GND
No Signal
10pin=L
10pin=H
THD=0.1%
V
O
=-28.2dBV
G
V
=29dB, V
O
=-28.2dBV
Rg=600Ω, A-Weighted
Rg=600Ω, A-Weighted, G
V
=29dB
Rg=600Ω, V
IN
=-18dBV
Rg=600Ω, V
IN
=-34dBV, Gv=29dB
V =3V,
∆V
=-20dBV, Rg=600Ω
+
+
V =3V,
∆V
=-20dBV, Rg=600Ω
G
V
=29dB
+
+
+
MIN.
2.7
-
-
1.28
12
28
-2.7
-
-
-
-
-
80
-
70
2.3
2.0
0
V -0.5
0
+
TYP.
-
-
2.2
1.35
13
29
-1.5
0.013
0.05
-105
(5.63)
-95
(17.8)
105
90
95
80
2.42
-
-
-
-
MAX.
4.5
1.0
2.8
1.42
14
30
-
0.026
0.1
-100
(10)
-90
(32)
-
-
-
-
2.54
V
+
UNIT
V
µA
mA
V
dB
dB
dBV
%
%
dBV
(µVrms)
dBV
(µVrms)
dB
dB
dB
dB
V
V
V
V
V
I
CC
1
I
CC
2
V
O
G
V
1
G
V
2
V
OM
THD1
THD2
V
NO
1
Output Noise Voltage
V
NO
2
Channel Separation
Supply Voltage Rejection
Ratio
Microphone Regulator
Output Voltage
High Level Input Voltage G
Low Level Input Voltage G
High Level Input Voltage S
Low Level Input Voltage S
CS1
CS2
SVR1
SVR2
V
REG
V
IHG
V
ILG
V
HIS
V
ILS
R
L
=3.55kΩ
Gv Termial
Gv Terminal
STBY Terminal
STBYTerminal
0.5
V
+
+
V -2.0
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CONTROL TERMINAL EXPLANATION
q
STBY (9Pin)
PARAMETER
CONTROL SIGNAL
STANDBY OFF
L
I IC is active.
STANDBY ON
H
I IC is non-active.
q
Gv (10Pin)
PARAMETER
Gv1
Gv2
STATUS
CONTROL SIGNAL
STATUS
L
I IC set up 13dB typ. voltage gain.
H
I IC set up 29dB typ. voltage gain.
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APPLICATION CIRCUIT
NJM2173A
2.2uF
2.2uF
OUT1
9kΩ
47uF
1
AMP1
AMP2
14
9kΩ
47uF
OUT2
DC CUT2
0.33uF
DC CUT1
0.33uF
2
3
6.8kΩ
13
12
6.8kΩ
IN1
MIC V
+
1
10uF
10uF
IN2
MIC V
+
2
4
5
1uF
11
10uF
REG
NOISE
GND
Gv
REG
10
9
8
47kΩ
10uF
Gv=29dB
Gv=13dB
STBY ON
STBY OFF
Gv
STBY
6
7
V
+
1uF
MEMO
[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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