NJM2755

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4-Input / 1-Output Stereo Audio Selector

■ GENERAL DESCRIPTION ■ PACKAGE OUTLINE

The NJM2755 is 4 Input / 1 Output Stereo Audio Selector.
The NJM2755 consists of switches and buffer operational
amplifiers.
Based on the internal switch op-amp technology, the
NJM2755 features lower output noise, lower distortion and
NJM2755V
higher channel separation than the general Multiplexers or
Analogue Switches.
The NJM2755 contains compatibility with NJM2752(2in-1out
SW),NJM2753(3in-1out SW).

■APPLICATIONS
●LCD-TV/PDP-TV
●Car Stereo
●Any Audio System

■ FEATURES
● Operating Voltage 4.7 to 10V
● 4 Input / 1 Output Stereo Audio Selectors
● Low Output Noise -114dBV typ.
● Low Distortion 0.0009% typ.
● Bipolar Technology
● Package Outline SSOP16

■ BLOCK DIAGRAM

IN1A CNT1
LOGIC
CNT2
IN1B

IN2A OUTA

IN2B

IN3A
OUTB
IN3B

IN4A ＋
V＋

IN4B Vref Vref

GND

Ver.1.1

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■ PIN CONFIGURATIONS
NJM2755 SSOP16
SSOP16

1 OUTA OUTB 16

NJM2755V
2 IN1A IN1B 15

3 V+ GND 14

4 IN2A IN2B 13

5 CNT1 Vref 12

6 IN3A IN3B 11

7 CNT2 N.C 10

8 IN4A IN4B 9

PIN.No. SYMBOL FUNCTION PIN.No. SYMBOL FUNCTION

1 OUTA Ach Output Terminal 9 IN4B Bch Input Terminal4
2 IN1A Ach Input Terminal1 10 N.C No Connection
3 V+ Power Supply Terminal 11 IN3B Bch Input Terminal3
4 IN2A Ach Input Terminal2 12 Vref Reference Terminal
5 CNT1 Control Switch Terminal1 13 IN2B Bch Input Terminal2
6 IN3A Ach Input Terminal3 14 GND GND Terminal
7 CNT2 Control Switch Terminal2 15 IN1B Bch Input Terminal1
8 IN4A Ach Input Terminal4 16 OUTB Bch Output Terminal

[Reference]
The NJM2755 contains compatibility with NJM2752 (2in-1out SW),NJM2753 (3in-1out SW).

NJM2752 NJM2753

1 OUTA OUTB 14 1 OUTA OUTB 14

NJM2753V
NJM2752V

2 IN1A IN1B 13 2 IN1A IN1B 13

3 V+ GND 12 3 V+ GND 12

4 IN2A IN2B 11 4 IN2A IN2B 11

5 CNT1 Vref 10 5 CNT1 Vref 10

6 N.C N.C 9 6 IN3A IN3B 9

7 N.C N.C 8 7 CNT2 N.C 8

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■ ABSOLUTE MAXIMUM RATINGS (Ta=25°C)

PARAMETER SYMBOL RATING UNIT
+
Supply Voltage V 12 V
SSOP16
1)
490
2)
Power Dissipation PD 630 mW
NOTE 1): EIA/JEDEC STANDARD Test board (76.2x114.3x1.6mm, 2layer, FR-4) mounting
2): EIA/JEDEC STANDARD Test board (76.2x114.3x1.6mm, 4layer, FR-4) mounting

Operating Temperature Range TOPR -40 to +85 °C

Storage Temperature Range TSTR -40 to +150 °C

+
■ ELECTRICAL CHARACTERISTICS ( Ta=25°C, V =9V)
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
+
Operating Voltage V 4.7 9.0 10 V
Supply Current ICC No Signal - 10 15 mA
Reference Voltage VREF - 4.5 - V
Voltage Gain GV Vin=1Vrms, f=1kHz -1 0 1 dB
Total Harmonic Distortion THD+N Vin=1Vrms, f=1kHz - 0.0009 0.03 %
- -114 -100 dBV
Output Noise Voltage VNO A-Weighted
- (2) (10) (µVrms)
6 8 dBV
Maximum Output Voltage VOM f=1kHz, THD=1% -
(2.0) (2.5) (Vrms)
Vin=1Vrms, f=1kHz,
Cross Talk CT 85 100 - dB
A-Weighted
Vin=1Vrms, f=1kHz,
Channel Separation CS 90 110 - dB
A-Weighted
Switch-ON Voltage Level VCH 2.4 - - V
Switch-OFF Voltage Level VCL - - 0.5 V
Input Impedance RIN - 100 - kΩ
Output Impedance ROUT - 45 - Ω

■ SWITCH CONTROL LOGIC

CNT2 CNT1 INPUT SELECTOR Ach / Bch

L L 1
L H 2
H L 3
H H 4

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■ TERMINAL DESCRIPTION

PIN TERMINAL
SYMBOL FUNCTION EQUIVALENT CIRCUIT
No. VOLTAGE
2 IN1A Ach Input Terminal1
4 IN2A Ach Input Terminal2 V+/2
6 IN3A Ach Input Terminal3
8 IN4A Ach Input Terminal4
9 IN4B Bch Input Terminal4 650

11 IN3B Bch Input Terminal3 100k

13 IN2B Bch Input Terminal2
15 IN1B Bch Input Terminal1 3p

5 CNT1 Control Switch Terminal1 0V (GND)

7 CNT2 Control Switch Terminal2

CNT 650

100k

1 OUTA Ach Output Terminal V+/2

16 OUTB Bch Output Terminal

OUTA
45 OUTB

100k

12 Vref Reference Terminal V+/2

50k
VREF
650

50k

3 V+ Power Supply Terminal V+

14 GND GND Terminal V+ 0V

12k

GND

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■MEASUREMENT CIRCUIT

10µF 10µF
+
+
1 OUTA OUTB 16

10µF 10µF
+
+
2 IN1A IN1B 15

NJM2755
+
3 V+ GND 14
100µF
10µF 10µF
+
+
4 IN2A IN2B 13

10µF
+
5 CNT1 Vref 12

10µF 10µF
+
+
6 IN3A IN3B 11

7 CNT2 N.C 10

10µF 10µF
+
+
8 IN4A IN4B 9

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■APPLICATION CIRCUIT

10µF 10µF
+
+
1 OUTA OUTB 16

10µF 10µF
+
+
2 IN1A IN1B 15

NJM2755
+
3 V+ GND 14
100µF
10µF 10µF
+
+
4 IN2A IN2B 13

10µF
+
5 CNT1 Vref 12
100k 1µF
10µF
+
6 IN3A IN3B 11
+
10µF
7 CNT2 N.C 10
100k 1µF
10µF
+
+
8 IN4A IN4B 9
10µF

Application note:
Resistor(100k) and capacitor(1µF) connected to CNT1 are added to reduce pop-noise.
The value of input capacitor connected to IN1A and IN2A depends on cut-off frequency(calculated by fc=1/2πRC)
you need. R(input impedance)=100kΩ.

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 NJM2755
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!TYPICAL CHARACTERISTICS

ICC vs Supply Voltage VREF vs Supply Voltage

No signal No signal

14 7
25oC,105oC
12 6
-40 to 105oC
10 5
ICC [mA]

8 4

VREF[V]
6 -40oC 3

4 2

2 1

0 0
0 2 4 6 8 10 12 14 0 2 4 6 8 10 12 14

Supply Voltage [V] Supply Voltage [V]

GAIN vs FrequencyV=9V, THD+N vs Input Voltage

I/O: INA1-Aout BW: 400-30kHz, f=1kHz, I/O: INA1-Aout

1 100

0.8
10
0.6
o
-40 to 105 C
0.4
1 -40oC
Gain Output [dB]

0.2
THD+N [%]

25oC
0 0.1

-0.2
105oC
0.01
-0.4

-0.6
0.001
-0.8

-1 0.0001
10 100 1000 10000 100000 0.01 0.1 1 10
Frequency [Hz] Input Voltage [Vrms]

THD+N vs Frequency Maximum Output Voltage vs Frequency

I/O: INA1-Aout V=9V, THD=1%, I/O: INA1-Aout
1 2.7

2.65
Maximum Output Voltage [Vrms]

0.1 2.6

2.55
THD+N [%]

-40 to 105oC
0.01 2.5

2.45

0.001 2.4

2.35

0.0001 2.3
10 100 1000 10000 100000 1 10 100 1000 10000 100000
Frequency [Hz] Frequency [Hz]

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!TYPICAL CHARACTERISTICS
Maximum Output Voltage vs Supply Voltage Maximum Output Voltage vs Load Resistance
THD=1%, I/O: INA1-1Aout V=9V, THD=1%, f=1kHz, I/O: INA1-Aout / INB1-Bout

4 3.0

3.5
2.5
Maximum Output Voltage [Vrms]

Maximum Output Voltage [Vrms]

3
2.0
2.5

2 1.5

1.5
1.0

1
0.5
0.5

0 0.0
0 2 4 6 8 10 12 14 1 10 100 1000 10000 100000
Supply Voltage [±V] RL[Ω]

Cross Talk vs Frequency Cross Talk vs Frequency

V=9V, Vin=1Vrms, BW:10-80kHz, V=9V, Vin=1Vrms, BW:10-80kHz,
I/O: INA2-INA4/Aout, Select Channel:1ch I/O: INA2-INA4/Aout, Select Channel:1ch
-40 -40

Rg=5.1kΩ
-50 -50

-60 -60
Rg=3.3kΩ 105oC
Cross Talk[dB]

Cross Talk[dB]

-70 -70
Rg=620Ω 25oC

-80 -80 -40oC

-90 -90

-100 -100
Rg=0Ω
-110 -110
10 100 1000 10000 100000 10 100 1000 10000 100000
Frequency [Hz] Frequency [Hz]

Channel Separation vs Frequency Channel Separation vs Frequency

V=9V, Vin=1Vrms, BW:10-80kHz, V=9V, Vin=1Vrms, BW:10-80kHz,
I/O: INB1-Aout I/O: INB1-Aout
-40 -40

-50 Rg=5.1kΩ -50

-60 -60
Channel Separation[dB]

Channel Separation[dB]

Rg=3.3kΩ
-70 -70
-40 to 105oC
Rg=620Ω
-80 -80
Rg=0Ω
-90 -90

-100 -100

-110 -110
10 100 1000 10000 100000 10 100 1000 10000 100000

Frequency [Hz] Frequency [Hz]

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!TYPICAL CHARACTERISTICS

CNT Voltage vsCross Talk CNT Voltage vsCross Talk

V=9V, Vin=1Vrms, A-w eghit V=9V, Vin=1Vrms, A-w eghit
I/O: IN2A-Aout I/O: IN1A-Aout
10 10
0 -40oC 25oC 105oC 0
105oC 25oC -40oC
-10 -10
-20 -20
-30 -30
-40 -40
Cross Talk[dB]

Cross Talk[dB]
-50 -50
-60 -60
-70 -70
-80 -80
-90 -90
-100 -100
-110 -110
-120 -120
-130 -130
1.5 1.7 1.9 2.1 2.3 2.5 1 1.2 1.4 1.6 1.8 2
CNT Voltage[V] CNT Voltage[V]

[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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