NJM2705
Surround Audio Processor for Mobile Applications
s
GENERAL DESCRIPTION
The
NJM2705
is the surround audio processor for mobile
applications.
It regenerates the 3D surround sound with extremely narrow
space two speakers (2SP mode), headphone surround with
normal headphone (HP mode) and reverberation sound with
only one speaker (1SP mode).
It includes mode control switches for surround function and
standby function and realizes low consumption power design by
standby function.
In addition to SSOP16, ultra small and thin packages FFP16
(Flip-Chip Fine Package) and PCSP16 (Plastic Chip Size
Package) is applied.
It is suitable for cellular phone, PDA and portable game.
s
PACKAGE OUTLINE
NJM2705PB1
NJM2705SD3
NJM2705V
s
FEATURES
q
Operating Voltage
q
Operating Current
1.8 to 6V
0.7mA typ. at Active mode
1µA max. at Standby mode
q
Low Output Noise
10µVrms typ
(2SP/HP/1SP mode, VR : max.)
q
Variable Surround Effect by external resistor
(Adjustable for speaker and headphone independently.)
q
Standby Function
q
Internal Mode Control Switch
q
Bipolar Technology
q
Package Outline
FFP16, PCSP16, SSOP16
s
BLOCK DIAGRAM
LOUT
LIN
3D
Filter
1SP
Surround
ROUT
3D
Enhancer
RIN
Bypass mode
2SP mode
Surround mode
HP mode
1SP mode
-1-
NJM2705
s
ABSOLUTE MAXIMUM RATING
(Ta=25°C)
PARAMETER
Supply Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
SYMBOL
+
V
P
D
T
opr
T
stg
RATINGS
7
(FFP16) 400
(PCSP16) TBD
(SSOP16) 300
-20 to +75
-40 to +125
UNIT
V
mW
°C
°C
s
OPERATING VOLTAGE
PARAMETER
Operating Voltage
SYMBOL
TEST CONDITION
-
MIN
1.8
TYP
3.0
MAX
6.0
UNIT
V
V
+
s
ELECTRICAL CHARACTERISTICS
(V+=3V, Ta=25°C unless otherwise specified)
TEST CONDITION
PARAMETER
Operating
Current
Reference
Voltage
SYMBOL
INPUT
L
R
0
0
0
0
0
0
OUT
PUT
MODE
SP
VR
HP
VR
MIN
TYP
MAX
UNIT
I
CC
Vref
No Signal
No Signal
-
-
-
Active
Standby
-
-
-
1.0
450
0.1
1.15
700
1.0
1.3
µA
V
qAC
CHARACTERISTICS
+
(V =3V, Ta=25°C, V
IN
=-20dBV(100mVrms), f=1kHz, RL=10kΩ, unless otherwise specified)
TEST CONDITION
PARAMETER
Maximum
Input Voltage
SYMBOL
INPUT
L
R
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
0
0
0
f=1kHz
THD=1%
f=100Hz
THD=1%
f=100Hz
THD=1%
f=100Hz
THD=1%
f=100Hz
THD=1%
V =1.8V,f=1kHz
THD=1%
V
+
=1.8V,f=100Hz
THD=1%
V
+
=1.8V,f=100Hz
THD=1%
V
+
=1.8V,f=100Hz
THD=1%
V
+
=1.8V,f=100Hz
THD=1%
Rg=0Ω
A-Weighted
Rg=0Ω
A-Weighted
Rg=0Ω
A-Weighted
Rg=0Ω
A-Weighted
+
OUT
PUT
MODE
SP
VR
-
HP
VR
-
MIN
TYP
-2.0
(790)
-16.0
(160)
-16.0
(160)
-16.0
(160)
-14.5
(190)
-8.5
(380)
-22.5
(75)
-22.5
(75)
-22.5
(75)
-21.0
(90)
-112
(2.5)
-100
(10)
-100
(10)
-100
(10)
MAX
UNIT
V
IM1
V
IM2
V
IM3
V
IM4
V
IM5
V
IM6
V
IM7
V
IM8
V
IM9
V
IM10
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
0
0
0
0
L
R
L
R
L
R
L
L
L
R
L
R
L
R
L
L
L
R
L
R
L
R
L
Bypass
2SP
HP
1SP
1SP
Bypass
2SP
HP
1SP
1SP
Bypass
1SP
HP
1SP
-
-
-
-
-
-10.5
(300)
-24.5
(60)
-24.5
(60)
-24.5
(60)
-23.0
(70)
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-106
(5.0)
-94
(20)
-94
(20)
-94
(20)
dBV
(µVrms)
MAX
-
-
MAX
MAX
-
MAX
-
-
-
dBV
(mVrms)
MAX
-
-
MAX
MAX
-
MAX
-
Output Noise
V
NO1
V
NO2
V
NO3
V
NO4
-
-
MAX
-
-
MAX
MAX
-
-3-
NJM2705
qAC
CHARACTERISTICS
+
(V =3V, Ta=25°C, V
IN
=-20dBV(100mVrms), f=1kHz, RL=10kΩ, unless otherwise specified)
TEST CONDITION
PARAMETER
SYMBOL
INPUT
L
R
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
V
IN
0
+
OUT
PUT
MODE
SP
VR
-
HP
VR
-
MIN
TYP
MAX
UNIT
Total Harmonic
Distortion
THD1
THD2
THD3
THD4
f=1kHz
f=1kHz
f=1kHz
f=1kHz
f=1kHz
f=100Hz
f=100Hz
f=100Hz
f=100Hz
f=100Hz
f=100Hz
f=100Hz
f=100Hz
L
R
L
R
L
R
L
R
L
R
L
R
L
R
L
R
L
R
L
L
L
L
Bypass
2SP
HP
1SP
Bypass
2SP
2SP
HP
HP
1SP
1SP
1SP
1SP
-
-
-
-
-1.0
12.5
0.5
12.5
0.5
6.5
2.0
-5.5
-12.0
0.02
0.1
0.1
0.1
0.0
14.5
2.5
14.5
2.5
8.5
4.0
-3.5
-10.0
0.05
0.5
%
0.5
0.5
1.0
16.5
4.5
16.5
4.5
dB
10.5
6.0
-1.5
-8.0
dB
MAX
-
-
MAX
MAX
-
BYPASS Gain
Surround Gain
G
VBYP
G
VSUR1
G
VSUR2
G
VSUR3
G
VSUR4
G
VSUR5
G
VSUR6
G
VSUR7
G
VSUR8
-
-
MAX
-
MIN
-
-
MAX
-
MIN
MAX
-
MAX
-
MIN
-
MIN
-
q
CONTROL CHARACTERISTICS
(V =3V, Ta=25°C unless otherwise specified)
PARAMETER
MODE Select
Control Voltage
SYMBOL
TEST CONDITION
V
IN
=High Level
V
IN
=Low Level
MIN
1.2
0.0
TYP
-
-
MAX
V
+
UNIT
V
V
MODE
0.3
s
SWITCH FUNCTION
SURROUND FUNCTION SW
MODE
Bypass
2SP mode
HP mode
1SP mode
SW1
L, OPEN
L, OPEN
H
H
SW2
L, OPEN
H
L, OPEN
H
NOTES
Input Through
Surround mode for narrow space two speakers
Surround mode for Headphone
Surround mode for monaural speaker (Surround signal from LOUT)
STANDBY SW
MODE
Standby
Active
STBY
L, open
H
IC is non-active
IC is active
NOTES
-4-
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