NJM2703
-1-
3D SURROUND AUDIO PROCESSOR FOR HEADPHONE
■
GENERAL DESCRIPTION
The NJM2703 is a high quality 3D surround audio processor
designed for headphone applications.
It includes mode control switch (Surround mode / Bypass
mode).
The NJM2703 features low operating voltage, low operating
current, low output noise and very small package, and is
suitable for any portable audio applications.
■ FEATURES
●Operating Voltage 1.8 to 6V
●Low Operating Current 0.45mA typ. (at Surround mode, VR: max.)
●Low Output Noise 10µV typ. (at Surround mode, VR: max.)
●Variable Surround Effect by external resistor
●Internal Mode Control Switch
●Bipolar Technology
●Package Outline MSOP10 (TVSP10)*
*MEET JEDEC MO-187-DA / THIN TYPE
■ PIN CONFIGURATION
■ BLOCK DIAGRAM
■
PACKAGE OUTLINE
NJM2703RB2
(MSOP10 (TVSP10) )
3D
FILTER
LIN
RIN
LOUT
ROUT
Bypass
Surroun d Mod e
+
+
-
+
1. LIN
2. RIN
3. SW
4. VREF
5. GND
6. V+
7. NFR
8. NFL
9. ROUT
10. LOUT
1
2
3
4
5
10
9
8
7
6
NJM2703
- 2 -
■ABSOLUTE MAXIMUM RATING
(Ta=25
°
C)
PARAMETER SYMBOL RATINGS UNIT
Supply Voltage V+ 7 V
Power Dissipation PD 320 mW
Operating Temperature Range Topr -20 to +75
°
C
Storage Temperature Range Tstg -40 to +125
°
C
■OPERATING VOLTAGE
PARAMETER SYMBOL
TEST CONDITION
MIN. TYP. MAX. UNIT
Operating
Voltage V+
-
1.8 3.0 6.0 V
■ELECTRICAL CHARACTERISTICS
(V+=3V, Ta=25
°
C unless otherwise specified)
TEST CONDITION
INPUT
PARAMETER SYMBOL
L R OUTPUT MODE VR
MIN. TYP. MAX. UNIT
0 0 - Bypass - - 0.45 0.7
Operating
Current
I
CC
No Signal
0 0 - Surround MAX - 0.45 0.7
mA
Reference
Voltage
Vref No Signal 0 0 - - - 1.0 1.15 1.3 V
●
AC CHARACTERISTICS
(V+=3V, Ta=25
°
C, VIN=-20dBV(100mVrms), f=1kHz, RL=10k
Ω
, unless otherwise specified)
TEST CONDITION
INPUT
PARAMETER SYMBOL
L R OUTPUT MODE VR
MIN. TYP. MAX. UNIT
f=1kHz
T.H.D.=1%
V
IN
0
0
V
IN
L
R Bypass - - -2.0
(790) -
f=100Hz
T.H.D.=1%
V
IN
0
0
V
IN
L
R Surround MAX - -16.0
(160) -
V+=1.8V
f=1kHz
T.H.D.=1%
V
IN
0
0
V
IN
L
R Bypass - -10.5
(300)
-8.5
(380) -
Maximum
Input Voltage
V
IM
V+=1.8V
f=100Hz
T.H.D.=1%
V
IN
0
0
V
IN
L
R Surround MAX -24.5
(60)
-22.5
(75) -
dBV
(mVrms)
Rg=0
Ω
A-Weighted 0 0 L
R Bypass - -
-112
(2.5)
-106
(5.0)
Output Noise V
NO
Rg=0
Ω
A-Weighted 0 0 L
R Surround MAX - -100
(10)
-94
(20)
dBV
(µVrms)
f=1kHz V
IN
0
0
V
IN
L
R Bypass - - 0.02 0.05
Total
Harmonic
Distortion
T.H.D
f=1kHz V
IN
0
0
V
IN
L
R Surround MAX - 0.1 0.5
%
NJM2703
-3-
●
AC CHARACTERISTICS
(V+=3V, Ta=25
°
C, VIN=-20dBV(100mVrms), f=1kHz, RL=10k
Ω
, unless otherwise specified)
TEST CONDITION
INPUT
PARAMETER SYMBOL
L R OUTPUT MODE VR
MIN. TYP. MAX. UNIT
Bypass Gain G
VBYP
f=1kHz V
IN
0
0
V
IN
L
R Bypass - -1.0 0.0 1.0 dB
f=100Hz V
IN
0
0
V
IN
L
R Surround MAX 12.5 14.5 16.5
f=100Hz 0
V
IN
V
IN
0
L
R Surround MAX 10.5 12.5 14.5
Surround Gain G
VSUR
f=100Hz V
IN
0
0
V
IN
L
R Surround MIN 0.5 2.5 4.5
dB
● CONTROL CHARACTERISTICS
(V+=3V, Ta=25
°
C unless otherwise specified)
TEST CONDITION
INPUT
PARAMETER SYMBOL
L R OUTPUT MODE VR
MIN. TYP. MAX. UNIT
V
IN
=
High Level - - - - - 1.2 - V+
Mode Select
Control
Voltage
V
MODE
V
IN
=
Low Level - - - - - 0.0 - 0.3
V
■MODE SWITCH
MODE SW NOTES
Bypass L, open Input Through
Surround H Surround Mode (Stereo Input)
NJM2703
- 4 -
■TERMINAL DESCRIPTION
PIN NO. SYMBOL FUNCTION EQUIVALENT CIRCUIT VOLTAGE
1
2
LIN
RIN
Rch Input
Lch Input
1.15V
3 SW Mode control switch
0V
4 VREF Reference voltage
1.15V
5 GND GND
0V
700
V+ V+
100k
VREF
V+
700
300k
V+ V+V+
300k
V+ V+V+
300k
NJM2703
-5-
PIN NO. SYMBOL FUNCTION EQUIVALENT CIRCUIT VOLTAGE
5
V+ Power Supply
V+
7
8
NFL
NFR
Filter terminal
Filter terminal
1.15V
9
10
ROUT
LOUT
Rch Output
Lch Output 1.15V
V+ V+
400
20k
V+ V+V+ V+
12k
20k
NJM2703
- 6 -
■
APPLICATION CIRCUIT
1
2
3
5
4
9
10
8
7
6
10
µ
10
µ
Lch IN
Rch IN
10
µ
10
µ
50kB
MAX
MIN
0.0033µ
0.0033µ
4.7k
Lch OUT
Rch OUT
LIN LOUT
RIN ROUT
SW NFL
VREF NFR
GND V+
1
µ
1
µ
SW
100k
V+(3V)
VR
100
µ
NJM2703
-7-
■
TYPICAL CHARACTERISTICS
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
01234567
Supply Current vs. Supply Voltage
Supply Current [mA]
Supply Voltage [V]
Ta=25degrees
BYPASS
Surround
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
-50-25 0 255075100125
Supply Current vs. Ambient Temperature
Supply Current [mA]
Ambient Temperature [degrees]
V+=3V
BYPASS
Surround
0
0.5
1
1.5
2
2.5
3
3.5
01234567
Reference Voltage vs. Supply Voltage
Reference Voltage [V]
Supply Voltage [V]
Ta=25degrees
-15
-10
-5
0
5
10
01234567
Maximum Input Voltage vs. Supply Voltage (BYPASS)
Maximum Input Voltage [dBV]
Supply Voltage [V]
Vin=Lch f=1kHz Vout=Lch RL=10kohm
THD=1% Ta=25degrees
-30
-25
-20
-15
-10
-5
01234567
Maximum Input Voltage vs. Supply Voltage (Surround)
Maximum Input Voltage [dBV]
Supply Voltage [V]
Vin=Lch f=100Hz Vout=Lch RL=10kohm VR=MAX
THD=1% Ta=25degrees
1
1.05
1.1
1.15
1.2
1.25
1.3
-50-25 0 255075100125
Reference Voltage vs. Ambient Temperature
Reference Voltage [V]
Ambient Temperature [degrees]
V+=3V
NJM2703
- 8 -
■
TYPICAL CHARACTERISTICS
-5
-4
-3
-2
-1
0
-50-25 0 255075100125
Maximum Input Voltage vs. Ambient Temperature (BYPASS)
Maximum Input Voltage [dBV]
Ambient Temperature [degrees]
V+=3V Vin=Lch f=1kHz Vout=Lch RL=10kohm
THD=1%
-20
-19
-18
-17
-16
-15
-50-25 0 255075100125
Maximum Input Voltage vs. Ambient Temperature (Surround)
Maximum Input Voltage [dBV]
Ambient Temperature [degrees]
V+=3V Vin=Lch f=100Hz Vout=Lch RL=10kohm
VR=MAX THD=1%
-10
-9
-8
-7
-6
-5
-50-25 0 255075100125
Maximum Input Voltage vs. Ambient Temperature (BYPASS)
Maximum Input Voltage [dBV]
Ambient Temperature [degrees]
V+=1.8V Vin=Lch f=1kHz Vout=Lch RL=10kohm
THD=1%
-25
-24
-23
-22
-21
-20
-50-25 0 255075100125
Maximum Input Voltage vs. Ambient Temperature (Surround)
Maximum Input Voltage [dBV]
Ambient Temperature [degrees]
V+=1.8V Vin=Lch f=100Hz Vout=Lch RL=10kohm
VR=MAX THD=1%
-120
-115
-110
-105
-100
-95
-90
-50-25 0 255075100125
Output Noise Voltage vs. Ambient Temperature
Output Noise Voltage [dBV]
Ambient Temperature [degrees]
V+=3V Rg=0ohm Vout=Lch VR=MAX
FILTER=A-Weighted
BYPASS
Surround
-120
-115
-110
-105
-100
-95
-90
-50-25 0 255075100125
Output Noise Voltage vs. Ambient Temperature
Output Noise Voltage [dBV]
Ambient Temperature [degrees]
V+=3V Rg=0ohm Vout=Rch VR=MAX
FILTER=A-Weighted
BYPASS
Surround
NJM2703
-9-
■TYPICAL CHARACTERISTICS
0.001
0.01
0.1
1
10
-50 -40 -30 -20 -10 0 10
Total Harmonic Distortion vs. Input Voltage (BYPASS)
THD+N [%]
Input Voltage [dBV]
V+=3V Vin=Lch f=1kHz Vout=Lch
RL=10kohm BW=10Hz to 80kHz
Ta=75deg.
Ta=25deg.
Ta=-20deg.
0.01
0.1
1
10
-50 -40 -30 -20 -10 0
Total Harmonic Distortion vs. Input Voltage (Surround)
THD+N [%]
Input Voltage [dBV]
V+=3V Vin=Lch f=100Hz Vout=Lch
RL=10kohm BW=10Hz to 80kHz VR=MAX
Ta=75deg.
Ta=25deg.
Ta=-20deg.
-1
-0.5
0
0.5
1
10 100 1000 10
4
10
5
Voltage Gain vs. Frequency (BYPASS)
Voltage Gain [dB]
Frequency [Hz]
V+=3V Vin=-20dBV Lch Vout=Lch
RL=10kohm Rg=25ohm
Ta=-20deg.
Ta=25deg.
Ta=75deg.
-5
0
5
10
15
20
10 100 1000 10
4
10
5
Voltage Gain vs. Frequency (Surround)
Voltage Gain [dB]
Frequency [Hz]
V+=3V Vin=-20dBV Lch Vout=Lch
RL=10kohm Rg=25ohm VR=MAX
Ta=-20deg.
Ta=25deg.
Ta=75deg.
-10
-5
0
5
10
15
10 100 1000 10
4
10
5
Voltage Gain vs. Frequency (Surround)
Voltage Gain [dB]
Frequency [Hz]
V+=3V Vin=-20dBV Rch Vout=Lch
RL=10kohm Rg=25ohm VR=MAX
Ta=-20deg.
Ta=25deg.
Ta=75deg.
-5
0
5
10
15
20
10 100 1000 10
4
10
5
Voltage Gain vs. Frequency (Surround)
Voltage Gain [dB]
Frequency [Hz]
V+=3V Vin=-20dBV Lch Vout=Lch
RL=10kohm Rg=25ohm VR=MIN
Ta=-20deg.
Ta=25deg.
Ta=75deg.
NJM2703
- 10 -
■
TYPICAL CHARACTERISTICS
[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.
-5
0
5
10
15
20
00.511.52
Voltage Gain vs. SW Terminal Input Voltage
Voltage Gain [dB]
SW Terminal Input Voltage [V]
V+=3V Vin=-20dBV Lch f=100Hz Vout=Lch VR=MAX
BYPASS to Surround
Ta=25deg.
Ta=-20deg.
Ta=75deg.
-10
-5
0
5
10
-50-25 0 255075100125
Output DC Offset Voltage vs. Ambient Temperature
Output DC Offset Voltage [mV]
Ambient Temperature [degrees]
V+=3V
BYPASS to Surround
Rch
Lch
