NJW2174
AUDIO LINE AMPLIFIE R with MUTE FUNCTION
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■ GENERAL DESCRIPTION ■
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■ PACKAGE OUTLINE
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■ FEARTURES
● Operating Voltage 4.5 to 5.5V
● Operating Current 2.5mA typ. at V
+
=5V
● Maximum Output Voltage 4dBV typ. at THD=0.1%
● Closed Loop Voltage Gain 3.5dB typ. at f=1kHz
2.5dB typ. at f=100kHz
● Mute Function -85dB typ.
● Supply Voltage Rejection Ratio 60dB typ.
● Bipolar Technology
● Package Outline SSOP14
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■ PIN CONFIGURATION
1
2
3
4
5
12
13
14
6
7
11
10
9
8
NJM2174V
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■ BLOCK DIAGRAM
BIAS
1
2
3
4
14
13
12
11
MUTE
GND
NC
MUTE1
OUT-R
NC
OUT-L
IN-L
V+
6
7
10
NC
9
NC
8
BIAS
5
MUTE2
MUTEC
IN-R
NJM2174V
The NJM2174 is a low voltage audio line amplifier designed for
audio items.
Internal closed loop voltage gain is suitable for amplif ier of small
line signal in digital audio items. It includes mute circuit
which realizes very low turn-noise at power on/off.
It is suitable for di
g
ital audio items with line out.
8. BIAS
9. NC
10. NC
11. IN-L
12. OUT-L
13. NC
14. V
+
PIN FUNCTION
1. GND
2. NC
3. OUT-R
4. MUTE 1
5. MUTE 2
6. MUTE C
7. IN-R
NJW2174
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■ ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
RARAMETER SYMBOL RATINGS UNIT
Supply Voltage V
+
7 V
Power Dissipaation P
D
300 mW
Operating Temperature Range Topr -20 to +75 °C
Storage Temperature Range Tstg -40 to +125 °C
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■ ELECTRICAL CHARACTERISTICS (V
+
=5V, V
IN
=-3dBV, R
L
=47kΩ, f=1kHz, Ta=25°C)
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Operating Voltage Range V
+
4.5 5.0 5.5 V
Operating Current I
CC
No signal - 2.5 4.5 mA
Reference Voltage V
REF
No signal 2.0 2.3 2.6 V
Closed Loop Voltage Gain1 G
V
1 2.5 3.5 4.5 dB
Closed Loop Voltage Gain2 G
V
2 f=100kHz -7.0 -2.5 -2.0 dB
Channel Gain Balance ∆G
V
-0.5 0 0.5 dB
Maximum Output Voltage V
OM
THD=0.1% 3 4 - dBV
Total Harmonic Distortion THD - 0.005 0.01 %
Output Noise Voltage V
NO
Rg=0Ω, A-Weighted - -95 -88 dBV
Mute Level MUTE V
O
/V
IN
- -85 -70 dB
Channel Separation CS 70 90 - dB
Supply Voltage Rejection
Ratio SVR V
RP
=-20dBV, Rg=0Ω 45 60 - dB
High Level Input Voltage V
IH
2.0 - V
+
V
Low Level Input Voltage V
IL
0 - 0.3 V
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■ CONTROL TERMNAL
MUTE1(4pin) MUTE2(5pin) STATUS
L L IC doesn’t output the signal.
L H IC doesn’t output the signal.
H L IC set up 3.5dB typ. voltage gain.
H H IC doesn’t output the signal.
NJW2174
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■ APPLICATION CIRCUIT
BIAS
1 2 3 4
14 13 12 11
MUTE
OUT-R
OUT-L IN-L
V
+
67
10
NC
9
NC
8
H
5
IN-R
40kΩ20kΩ
135kΩ40pF
135kΩ
40kΩ
135kΩ40pF
20kΩ
135kΩ
H
LL
NC
NC
10µF 10µF4.7
µF
10µF 10µF
1µF
NJW2174
!
TERMINAL DESCRIPTION
No. SYMBOL FUNCTION EQUIVALENT CIRCUIT VOLTAGE
1 GND Ground Terminal 0V
2 NC
3
12 OUT-R
OUT-L Rch Output
Lch Output
2.3V
4
5 MUTE1
MUTE2 Mute Switch Terminal 1
Mute Switch Terminal 2
-
6 MUTEC
Pop Noise reduction for Mute
Switch
-
7
11 IN-R
IN-L Rch Input
Lch Input
V+/2
10p
Vcc
65k
300
20k
Vcc
50k
Vcc
150k
Vref
Vcc
40p
135k
135k
50k
NJW2174
!
TERMINAL DESCRIPTION
No. SYMBOL FUNCTION EQUIVALENT CIRCUIT VOLTAGE
8 BIAS Reference Voltage
2.3V
9 NC
10 NC
13 NC
14 V
+
Power Supply Terminal V
+
2k
40k
130k
