NJM2750
-1-
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
IN1a
IN2a
IN3a
IN4a
IN1b
IN2b
IN3bIN4b
Vref
V+
GND
CNT1
CNT2
OUTa
OUTb
(N.C.)
LOGIC
bias
V+
4 INPUT / 1 OUTPUT STEREO AUDIO SELECTOR
■ GENERAL DESCRIPTION ■ PACKAGE OUTLINE
The NJM2750 is 4 Input / 1 Output Stereo Audio Selector.
Based on the internal Switch OP-AMP technology, the
NJM2750 has lower Output Noise, lower Distortion and
higher Channel Separation than the ordinary Multiplexers or
Analogue Switches.
The NJM2750 is suitable for any kinds of audio
equipments, such as TV, Car Stereo, Mini-Compo and so
on.
■ FEATURES
● Operating Voltage (4.7 to 13V)
● 4 Input / 1 Output Audio Selectors
● Dual Channel for Stereo Use
● Low Output Noise (-110dBV typ.)
● Low Distortion (0.005% typ.)
● Bipolar Technology
● Package Outline (DMP16)
■ BLOCK DIAGRAM ■ PIN CONFIGURATION
NJM2750M
PIN No. SYMBOL FUNCTION
1 IN1a Ach INPUT SELECTOR
2 CNT1 CONTROL 1
3 IN2a Ach INPUT SELECTOR 2
4 CNT2 CONTROL 2
5 IN4a Ach INPUT SELECTOR 4
6 IN1b Bch INPUT SELECTOR 1
7 IN2b Bch INPUT SELECTOR 2
8 IN4b Bch INPUT SELECTOR 4
9 IN3b Bch INPUT SELECTOR 3
10 (N.C.) NO CONNECT
11 OUTb Bch OUTPUT
12 Vref REFERENCE VOLTAGE
13 IN3a Ach INPUT SELECTOR 3
14 V+ POWER SUPPLY
15 OUTa Ach OUTPUT
16 GND GROUND
NJM2750
- 2 -
■ ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
■ ELECTRICAL CHARACTERISTICS ( Ta=25°C, V
+
=9V)
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Operating Voltage V
+
4.7 9.0 13.0 V
Supply Current I
CC
No Signal - 10 20 mA
Reference Voltage V
REF
- 4.5 - V
Voltage Gain G
V
Vin=1Vrms, f=1kHz -1 0 1 dB
Total Harmonic Distortion THD+N Vin=1Vrms, f=1kHz - 0.005 0.05 %
Output Noise Voltage V
NO
A-Weighted -
-
-110
(3)
-100
(10)
dBV
(µVrms)
Maximum Output Voltage V
OM
f=1KHz, THD=1% 6
(2.0)
8
(2.5) - dBV
(Vrms)
Cross Talk CT Vin=1Vrms, f=1kHz,
A-Weighted 70 90 - dB
Channel Separation CS Vin=1Vrms, f=1kHz,
A-Weighted 70 90 - dB
Switch-ON Voltage Level V
CH
2.4 - - V
Switch-OFF Voltage Level V
CL
- - 0.8 V
■ SWITCH CONTROL LOGIC
PARAMETER SYMBOL RATING UNIT
Supply Voltage V
+
15 V
Power Dissipation P
D
300 mW
Operating Temperature Range T
OPR
-40 to +85 °C
Storage Temperature Range T
STR
-40 to +125 °C
CNT2 CNT1 INPUT SELECTOR Ach / Bch
L L 1
L H 2
H L 3
H H 4
NJM2750
-3-
■ TERMINAL DESCRIPTION
PIN No. SYMBLE EQUIVALENT CIRCUIT VOLTAGE NOTE
1
3
5
6
7
8
9
13
IN1a
IN2a
IN4a
IN1b
IN2b
IN4b
IN3b
IN3a
V+/2
2
4
CNT1
CNT2
0V (GND)
11
15
OUTb
OUTa
V+/2
12 Vref
V+/2
14
16
V+
GND
V+
0V
OUTa
OUTb
GND
V+
30
GND
V+
V+
CNT1
CNT2
GND
V+
180
100
K
Vref
GND
V+
30
60K
45K
IN1a
IN2a
IN3a
IN4a
GND
V+
180
VREF
100
K
IN1b
IN2b
IN3b
IN4b
NJM2750
- 4 -
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
IN1a
IN2a
IN3a
IN4a
IN1b
IN2b
IN3bIN4b
Vref
V+
GND
CNT1
CNT2
OUTa
OUTb
(N.C.)
LOGIC
bias
V+
0.1uF
+
0.1uF
+
0.1uF
+
0.1uF
+
0.1uF
+
0.1uF
+
4.7uF
+
0.1uF
+
4.7uF
+
0.1uF
+
10uF
+
100uF
+
9V
10uF
+
10k
10uF
+
10k
100k
100k
■ APPLICATION CIRCUIT
NJM2750
-5-
■ MEASUREMENT CIRCUIT
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
IN1a
IN2a
IN3a
IN4a
IN1b
IN2b
IN3bIN4b
Vref
V+
GND
CNT1
CNT2
OUTa
OUTb
(N.C.)
LOGIC
bias
V+
1uF
+
1uF
+
1uF
+
1uF
+
1uF
+
1uF
+
4.7uF
+
1uF
+
4.7uF
+
1uF
+
10uF
+
100uF
+
9V
100k
100k
0.8V
2.4V
0.8V
2.4V
NJM2750
- 6 -
■ TYPICAL CHARACTERISTICS
Supply Current vs Supply Voltage
0
1
2
3
4
5
6
7
8
9
10
0
5
10
15
Supply Voltage [V]
Supply Current [mA]
Ta=25°C
Voltage Gai n vs Freq uenc y Res po n s e
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
10 100 1000
10000
100000
Frequency [Hz]
Voltage Gain [dB]
V+=9V Vin=1Vrms Ta=25°C Ach.
10 100 1K
10K
100K
Total Harmon ic Distor tion vs Input Voltage
0.001
0.01
0.1
1
10
-40
-30
-20 -10
0
10
Input Voltage [dBV]
THD+N
[
％
]
V+=9V Ta=25°C Ach.
f=20Hz
f=1kHz
f=20kHz
Cross Tal k vs Fr e qu en c y Res p on se
0
10
20
30
40
50
60
70
80
90
100
110
120
10 100 1000
10000
100000
Frequency [Hz]
Cross Talk [dB]
V+=9V Vin=1Vrms A-Weighted Ta=25°C Ach.
10 100 1k
10k
100k
Chann el S e paration vs Fre quency Res po nse
0
10
20
30
40
50
60
70
80
90
100
110
120
10
100
1000
10000
100000
Frequency [Hz]
Channel Separation [dB]
V+=9V Vin=1Vrms A-Weighted Ta=25°C Ach.in Bch.out
10
100
1k
10k
100k
NJM2750
-7-
■ TYPICAL CHARACTERISTICS
Suppl y Curr ent vs Ambien t Temper a tur e
0
1
2
3
4
5
6
7
8
9
10
-100
-50
050
100 150
Ambient Temperature [°C]
Supply Current [mA]
V+=9V
Voltage Gain vs Ambient Temperature
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
-100 -50 050
100
150
Ambient Temperature [°C]
Voltage Gain [dB]
V+=9V Vin=1Vrms f=1kHz Ach.
Total Harmonic Distortion vs Ambient Temperature
0.001
0.01
0.1
1
-100
-50
050
100
150
Ambient Temperature [°C]
Total Harmonic Distortion [%]
V+=9V Vin=1Vrms f=1kHz Ach.
Output N oi se Volta ge vs Ambi en t Te m per at ur e
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-100 -50 050
100
150
Ambient Temperature [°C]
Output Noise Voltage [dBV]
V+=9V Rg=0ΩA-Weighted Ach.
Maximum Ou tp ut Vol tage vs Ambient Tempera t ur e
6
7
8
9
10
-100
-50
050
100 150
Ambient Temperature [°C]
Maximum Output Voltage [dBV]
V+=9V f=1kHz at THD+N =1% Ach.
Cro ss Talk vs Ambient Temperature
0
10
20
30
40
50
60
70
80
90
100
110
120
-100 -50 050
100
150
Ambient Temperature [°C]
Cross Talk [dB]
V+=9V Vin=1Vrms f=1kHz A-Weighted Ach.
NJM2750
- 8 -
■ TYPICAL CHARACTERISTICS
Channel Separation vs Ambient Temperature
0
10
20
30
40
50
60
70
80
90
100
110
120
-100
-50
0
50
100
150
Ambient Temperature [°C]
Channel Separation [dB]
V+=9V Vin=1Vrms f=1kHz A-Weighted Ach.in Bch.out
[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.
