NJRC NJU72010

NJU72010
2Vrms Ground Referenced Stereo Line Amplifier with LPF
■ PACKAGE OUTLINE
■ GENERAL DESCRIPTION
The NJU72010 is an audio line Amplifier .
It can swing 2Vrms (5.6V peak-to-peak) signal at 3.3V
operating voltage.
Ground-referenced outputs eliminate output coupling
capacitor. The pop noise suppression circuit removes a pop
noise at the power-on and power-off.
It is suitable for audio line interface of audio equipment
which does not have over 9V regulator.
NJU72010RB2
NJU72010V
■ APPLICATIONS
● Audio applications requiring 2Vrms outputs
■ FEATURES
● Operating Voltage
● Operating Current
●
●
●
●
●
+2.7 to +3.6V
IDD=5mA typ.
+
at V =3.3V, RL=47kΩ, No Signal
Output Coupling Capacitor-less
Pop Noise Suppression Circuit
LPF
C-MOS Technology
Package Outline
TVSP10, SSOP14
■ BLOCK DIAGRAM
V
+
OUTL
INL
Mute Tr
OUTR
INR
Mute Tr
Pop Noise
Suppression
V
MUTE
Bias
GND
Ver.2.2E
-
Charge Pump
CP
CN
–1–
NJU72010
■ PIN CONFIGURATION
TVSP10
1
10
5
6
No.
Symbol
1
2
3
4
5
6
7
8
9
10
INL
OUTL
V+
CP
CN
VMUTE
GND
OUTR
INR
No.
Symbol
1
2
3
4
5
6
7
8
9
10
11
12
13
14
NC
INL
OUTL
V+
CP
CN
NC
NC
VMUTE
GND
OUTR
INR
NC
Function
Lch Input
Lch Output
V+ Power Supply
Flying Capacitor Positive Terminal
Flying Capacitor Negative Terminal
V- Power Supply
Mute / Pop Noise Suppression
Ground
Rch Output
Rch Input
SSOP14
–2–
1
14
7
8
Function
NC
Lch Input
Lch Output
V+ Power Supply
Flying Capacitor Positive Terminal
Flying Capacitor Negative Terminal
NC
NC
V- Power Supply
Mute / Pop Noise Suppression
Ground
Rch Output
Rch Input
NC
NJU72010
■ ABSOLUTE MAXIMUM RATING (Ta=25°C)
PARAMETER
SYMBOL
+
Supply Voltage
V
Power Dissipation
PD
RATING
UNIT
V
mW
Maximum Input Voltage
VIMAX
+4
(Note1)
TVSP10 : 530
(Note1)
SSOP14 : 550
+
+
-V -0.3 ~ V +0.3
Operating Temperature Range
Topr
-40 ~ +85
°C
Storage Temperature Range
Tstg
-40 ~ +125
°C
V
(Note1) EIA/JEDEC STANDARD Test board (76.2x114.3x1.6mm, 2layer, FR-4) mounting
■ RECOMMENDED OPERATING CONDITIONS
(Ta=25°C unless otherwise specified)
PARAMETER
Operating Voltage
SYMBOL
TEST CONDITION
+
V
MIN.
TYP.
MAX.
UNIT
2.7
3.3
3.6
V
MIN.
TYP.
MAX.
UNIT
-
5
10
mA
■ ELECTRICAL CHARACTERISTICS
+
(Ta=25°C, V =3.3V, f=1kHz, Vin=1Vrms, Mute=OFF, RL=47kΩ unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITION
Operating Current
IDD
Output Gain
GV
5.2
6.2
7.2
dB
∆GV
-0.5
0
0.5
dB
Output Gain Error
No signal
Maximum Output Voltage Level
VOMAX
THD=1%
-
2.3
-
Vrms
Mute Level
VMUTE
Rg=0Ω, Mute=ON
-
-110
-
dB
Equivalent Input Noise Voltage
VNO
Rg=0Ω, BW:400Hz-22kHz
-
-106
-
dB
Total Harmonic Distortion
THD
BW:400Hz-22kHz
-
0.003
-
%
80
-
-
dB
100
150
200
kHz
Rg=0Ω
-
1
5
mV
Vripple=1kHz / 100mVrms
-
45
-
dB
-
300
-
Ω
TYP.
MAX.
UNIT
Channel Separation
Cut-off Frequency
Output Offset Voltage
Power Supply Rejection Ratio
Output Impedance
CS
fC
VOS
PSRR
Rg=600Ω
2
nd
order LPF
ROUT
■ CONTROL CHARACTERISTICS
+
(Ta=25°C, V =3.3V, RL=47kΩ unless otherwise specified)
PARAMETER
Mute terminal High
Mute terminal Low
SYMBOL
MuteH
MuteL
TEST CONDITION
Mute=OFF
Mute=ON
MIN.
0.8V
0
+
-
+
V
V
+
0.2V
V
–3–
NJU72010
„TEST CIRCUIT (IDD)
1uF
1
INL
INR
1uF
10
C2
C8
2
V+
OUTL
OUTR
Mute-Tr
9
Mute-Tr
A
3 V+
4
GND
Pop Noise
Suppression
CP
V+
MUTE
Bias
1uF
8
7
Charge
Pump
C4
5
CN
V-
INL
INR
C6
10uF
6
„TEST CIRCUIT (GV, VOMAX, THD)
1uF
1
1uF
10
C2
C8
2
47kΩ
OUTL
V
OUTR
Mute-Tr
9
V
Mute-Tr
47kΩ
V+
10uF
3 V+
Pop Noise
Suppression
C11
4
CP
1uF
8
V+
MUTE
7
Charge
Pump
C4
5
–4–
Bias
GND
CN
V-
C6
6
10uF
NJU72010
„TEST CIRCUIT (VMUTE)
1uF
1
INL
INR
1uF
10
C2
C8
2
47kΩ
OUTL
V
OUTR
Mute-Tr
9
V
Mute-Tr
47kΩ
V+
10uF
3 V+
4
CP
1uF
GND
Pop Noise
Suppression
C11
MUTE
Bias
8
7
Charge
Pump
C4
5
CN
V-
INL
INR
C6
10uF
6
„TEST CIRCUIT (VNO)
VNO=(measurement)-Gv1
1uF
1
1uF
10
C2
C8
2
47kΩ
OUTL
V
OUTR
Mute-Tr
9
V
Mute-Tr
47kΩ
V+
10uF
3 V+
Pop Noise
Suppression
C11
4
CP
1uF
Bias
GND
8
V+
MUTE
7
Charge
Pump
C4
5
CN
V-
C6
10uF
6
–5–
NJU72010
„TEST CIRCUIT (CS)
1uF
1
INL
INR
1uF
Rg=600Ω
10
C2
C8
2
OUTL
OUTR
47kΩ
Mute-Tr
9
V
Mute-Tr
47kΩ
V+
10uF
3 V+
4
CP
1uF
GND
Pop Noise
Suppression
C11
V+
MUTE
Bias
5
7
C7
Charge
Pump
C4
8
CN
V-
INL
INR
C6
10uF
6
„TEST CIRCUIT (fC)
1uF 1kΩ R1
C2
C3
1
820pF
820pF
C9
2
RL=47kΩ
1kΩR3 1uF
10
OUTR
OUTL
V
Mute-Tr
9
V
Mute-Tr
V+
10uF
3 V+
C11
4
CP
1uF
Bias
GND
8
V+
MUTE
7
Charge
Pump
C4
5
–6–
Pop Noise
Suppression
CN
C8
V-
C6
6
10uF
RL=47kΩ
NJU72010
„TEST CIRCUIT (VOS)
1uF
1
INL
INR
1uF
10
C2
C8
2
OUTL
V
OUTR
Mute-Tr
9
V
Mute-Tr
V+
10uF
3 V+
4
GND
Pop Noise
Suppression
C11
CP
V+
MUTE
Bias
1uF
5
7
C7
Charge
Pump
C4
8
CN
V-
INL
INR
C6
10uF
6
„TEST CIRCUIT (PSRR)
Vripple=1kHz / 100mVrms
1uF
1
1uF
10
C2
C8
2
47kΩ
OUTL
V
OUTR
Mute-Tr
9
V
Mute-Tr
47kΩ
V+
3 V+
Vripple
C11
Pop Noise
Suppression
10uF
4
CP
1uF
Bias
GND
8
V+
MUTE
7
Charge
Pump
C4
5
CN
V-
C6
10uF
6
–7–
NJU72010
„APPLICATION CIRCUIT
2
nd
order LPF
1uF 1kΩ
1
INL
INR
10
1kΩ 1uF
820pF
820pF
2
OUTR
OUTL
Mute-Tr
9
Mute-Tr
V+
10uF
+
3
4
V+
CP
1uF
Bias
GND
MUTE
8
7
CN
22kΩ
4.7uF
Charge
Pump
5
–8–
Pop Noise
Suppression
V-
6
+
10uF
NJU72010
„ APPLICATION NOTE
The NJU72010 is an audio line amplifier that eliminates the need for external dc-blocking output capacitors.
The NJU72010 has built-in pop suppression circuitry to eliminate disturbing pop noise during power-on,
power-off and mute-control.
1. Operating Principle
The NJU72010 has the built-in non-inverted input operational amplifiers, voltage inverter, and pop noise
suppression circuitry (Fig.1).
The voltage inverter for NJU72010 eliminates the need for external dc-blocking output capacitors. The pop
suppression circuitry for NJU72010 eliminates the pop noise during power-on, power-off and mute-control.
1uF 1kΩ
C2
R1
1
INL
INR
C3
820pF
1kΩ R31uF
10
820pF
C9
2
OUTR
OUTL
Mute-Tr
C8
9
Mute-Tr
V+
10uF
3
+
V+
Pop Noise
Suppression
C11
4
CP
1uF
Bias
GND
MUTE
8
Charge
Pump
C4
5
CN
22kΩ
7
C7
V-
6
4.7uF
C6
R2
10uF
+
Fig.1 The NJU72010 functional block diagram
1.1 External parts
1.1.1 Input coupling capacitors Ci (C2, C8)
The input coupling capacitor (Ci) and the total of the external resistance (R1, R3) and the input
resistance (Rin=218kΩ typ.) for the non-inverted terminal form a high-pass filter with the corner
frequency determined in [fc=1/(2π x (R1+218kΩ) x Ci)). It is necessary to adjust 1uF or more.
–9–
NJU72010
1.1.2 Flying capacitor (C4)
Use capacitors with a low-ESR (ex. ceramic capacitors) for optimum performance. Design to provide
low impedance for the wiring between CP terminal (4pin), CN terminal (5pin), and the flying capacitor
(C4).
CP(4pin)
C4=1uF
CN(5pin)
Fig.2 The NJU72040 block diagram (4pin, 5pin)
1.1.3 Hold capacitor (C6)
Use capacitors with a low-ESR (ex. ceramic capacitors) for optimum performance. Design to provide
low impedance for the wiring between the hold capacitor (C6), V- terminal (6pin) and the GND on the
PCB.
Separate the GND pattern connecting to the hold capacitor (C6) from that connecting to the GND
terminal (8pin), thus suppressing the influence of switching noise by removing the common impedance
of the GND wiring.
Design no short-circuits of V- terminal (6pin) and V+ terminal (3pin) on the PCB pattern.
V-(6pin)
C6
GND(8pin)
Fig.3 The NJU72010 block diagram (6pin, 8pin)
1.1.4 Mute terminal pop noise countermeasures (R2, C7)
Mute terminal needs time constant more than R2 x C7=0.1. It is necessary to adjust 22kΩ or less.
MUTE(7pin)
R2=22kΩ
Vcnt
400kΩ
C7=4.7uF
Fig.4 The NJU72010 block diagram (7pin)
– 10 –
NJU72010
1.2 Control of V+ terminal and Mute terminal
1.2.2 Power-on procedure
1. Turn on the V+.
2. After 100msec from power on, change the control voltage of MUTE terminal (Vcnt) from "Low" to
"High".
* It is necessary to stabilize an IC for 100msec.
By releasing the MUTE function, the output terminal output the signal.
1.2.3 Power-off procedure
1. Change the control voltage of MUTE terminal (Vcnt) from "High" to "Low".
By the MUTE function, the output signals are stopped from output terminal.
2. Turn off the V+ after “2RC” sec from MUTE.
* It is necessary to stabilize a MUTE condition for “2RC” sec.
Ex.) R2=22kΩ, C7=4.7uF -> 2R2 x C7=200msec
V+
(3pin
t
100msec
200msec
Vcnt
MUTE
MUTE
MUTE
t
MUT
(7pin)
t
Fig.5 Power-on / Power-off timing chart
– 11 –
NJU72010
„TERMINAL DESCRIPTION
Terminal
SYMBOL
FUNCTION
EQUIVALENT CIRCUIT
VOLTAGE
V+
1
10
INL
INR
18kΩ
AC Input
0V
30pF
1kΩ
200kΩ
V-
GND
VDD
2
9
OUTL
OUTR
100Ω
200Ω
8.68kΩ
AC Output
0V
1kΩ
7kΩ
V-
GND
V+
3
V+
Supply Voltage
V+
V-
V+
4
CP
Flying Capacitor
Positive Terminal
-
V-
„TERMINAL DESCRIPTION
– 12 –
GND
NJU72010
Terminal
SYMBOL
FUNCTION
EQUIVALENT CIRCUIT
VOLTAGE
V+
5
CN
Flying Capacitor
Negative Terminal
-
V-
GND
V+
6
V-
V- Voltage
-[V+]
V-
V+
7
MUTE
100Ω
MUTE/Pop Noise
Suppression
0V
400kΩ
V-
GND
– 13 –
NJU72010
„TYPICAL CHARACTERISTICS
Supply Current vs Supply Voltage
No signal
Maxim um Output Voltage vs Supply Voltage
THD=1%, RL=47kohm, I/O: INL-OUTL
8
3.0
Maximum Output Voltage [Vrms]
-40OC
Supply Current [mA]
6
25OC
4
85OC
2
0
2.0
-40, 25, 85OC
1.5
1.0
0
1
2
3
4
2.5
3.0
3.5
4.0
Supply Voltage [V]
Supply Voltage [V]
Maxim um Output Voltage vs Frequency
V +=3.3V, THD=1%, RL=47kohm, I/O: INL-OUTL
Maxium Output Voltage vs Load Resistance
V +=3.3V, f=1kHz ,I/O: INL-OUTL
3.0
Maximum Output Voltage [Vrms]
3.0
Maximum Output Voltage [Vrms]
2.5
25, 85OC
2.5
2.0
-40OC
1.5
1.0
10
10
100
1000
10000
2.5
25, 85OC
2.0
-40OC
1.5
1.0
1000
100000
10000
100000
Frequency [Hz]
RL[Ω]
Gain vs Frequency
V +=3.3V, Vout=2Vrms, RL=47kohm, I/O: INL-OUTL
2nd Order LPF
THD+N vs Output Voltage
V +=3.3V, Ta=25OC, RL=47kohm, I/O: INL-OUTL
BW:10-22kHz (f=100Hz), 400-22kHz (f=1k,10kHz)
1
NJU72011
9
0.1
THD+N [%]
Gain [dB]
8
NJU72010
7
6
100Hz
0.01
5
10kHz
4
1kHz
3
0.001
10
100
1000
10000
Frequency [Hz]
– 14 –
100000
1000000
0.1
1
Output Voltage [Vrms]
10
NJU72010
„TYPICAL CHARACTERISTICS
THD+N vs Frequency
V +=3.3V, RL=47kohm, Vout=2Vrms, I/O: INL-OUTL
BW:10-80kHz
1
-40
85OC
THD+N [%]
25OC
-40OC
Channel Separation[dB]
-60
0.1
0.01
Channel Separation vs Frequency
V *=3.3V, RL=47kohm, Vout=2Vrms, I/O:INL-OUTR
Filter=Bandpass
-80
-40OC
-100
25, 85OC
0.001
-120
10
100
1000
10000
100000
10
100
Frequency [Hz]
10000
100000
Frequency [Hz]
Mute Control Voltage vs. Mute Level
V +=3.3V, Vout=2Vrms, f=1kHz, Filter=Bandpass
PSRR vs. Frequency
V +=3.3V, Vripple=100mVrms, f=1kHz, Filter=Bandpass
20
-20
0
-30
-20
Mute Level [ dB ]
85OC
-40
PSRR [ dB ]
1000
-50
-40,25OC
-60
85OC
-40
-60
-80
-40,25OC
-70
-100
-80
-120
10
100
1000
Frequency [ Hz ]
10000
100000
0
1
2
3
4
Mute Control 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.
– 15 –