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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 1A max. at Standby mode q Low Output Noise 10Vrms 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 PIN CONFIGURATION FFP16 (Top View)
12 11 10 13 14 15 16 1
PCSP16 (Top View)
9 8 7 6 5
1. 2. 3. 4. 5. 6. 7. 8. LIN RIN LOUT ROUT NFSPR NFHPR NFSPL NFHPL 9. LMON 10. PS 11. SW2 12. SW1 13. STBY 14. V+ 15. GND 16. VREF
2
3
4
12 11 10
9
1. 2. 3. 4. 5. 6. 7. 8. ROUT LOUT RIN LIN VREF GND V+ STBY 9. SW1 10. SW2 11. PS 12. LMON 13. NFHPL 14. NFSPL 15. NFHPR 16. NFSPR
13 14 15 16
8 7 6 5
1
2
3
4
SSOP16 (Top View)
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
1. 2. 3. 4. 5. 6. 7. 8.
NFHPR NFSPR ROUT LOUT RIN LIN VREF GND
9. V+ 10. STBY 11. SW1 12. SW2 13. PS 14. LMON 15. NFHPL 16. NFSPL
-2-
NJM2705
sABSOLUTE MAXIMUM RATING (Ta=25C)
PARAMETER Supply Voltage Power Dissipation Operating Temperature Range Storage Temperature Range SYMBOL + V PD Topr Tstg RATINGS 7 (FFP16) 400 (PCSP16) TBD (SSOP16) 300 -20 to +75 -40 to +125 UNIT V mW C C
sOPERATING VOLTAGE
PARAMETER Operating Voltage
SYMBOL
TEST CONDITION -
MIN 1.8
TYP 3.0
MAX 6.0
UNIT V
V+
sELECTRICAL CHARACTERISTICS (V+=3V, Ta=25C 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
ICC Vref
No Signal No Signal
-
Active Standby -
1.0
450 0.1 1.15
700 1.0 1.3
A
V
qAC CHARACTERISTICS + (V =3V, Ta=25C, VIN=-20dBV(100mVrms), f=1kHz, RL=10k, unless otherwise specified)
TEST CONDITION PARAMETER Maximum Input Voltage
SYMBOL
INPUT L R 0 VIN 0 VIN 0 VIN 0 VIN 0 VIN 0 VIN 0 VIN 0 VIN 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=0 A-Weighted Rg=0 A-Weighted Rg=0 A-Weighted Rg=0 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
VIM1 VIM2 VIM3 VIM4 VIM5 VIM6 VIM7 VIM8 VIM9 VIM10
VIN 0 VIN 0 VIN 0 VIN 0 VIN 0 VIN 0 VIN 0 VIN 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 (Vrms)
MAX
-
-
MAX
MAX
-
MAX
-
-
-
dBV (mVrms)
MAX
-
-
MAX
MAX
-
MAX
-
Output Noise
VNO1 VNO2 VNO3 VNO4
-
-
MAX
-
-
MAX
MAX
-
-3-
NJM2705
qAC CHARACTERISTICS + (V =3V, Ta=25C, VIN=-20dBV(100mVrms), f=1kHz, RL=10k, unless otherwise specified)
TEST CONDITION PARAMETER
SYMBOL
INPUT L R 0 VIN 0 VIN 0 VIN 0 VIN 0 VIN 0 VIN 0 VIN 0 VIN 0 VIN 0 VIN 0 VIN VIN 0 VIN 0 VIN 0 VIN 0 VIN 0 VIN 0 VIN 0 VIN 0 VIN 0 VIN 0 VIN 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
GVBYP GVSUR1 GVSUR2 GVSUR3 GVSUR4 GVSUR5 GVSUR6 GVSUR7 GVSUR8
-
-
MAX
-
MIN
-
-
MAX
-
MIN
MAX
-
MAX
-
MIN
-
MIN
-
qCONTROL CHARACTERISTICS (V =3V, Ta=25C unless otherwise specified)
PARAMETER MODE Select Control Voltage
SYMBOL
TEST CONDITION VIN=High Level VIN=Low Level
MIN 1.2 0.0
TYP -
MAX V+ 0.3
UNIT V
VMODE
sSWITCH 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-
NJM2705
sTERMINAL DESCRIPTION
PIN No.
FFP 16 PCSP 16 SSOP 16
SYMBOL
FUNCTION
EQUIVALENT CIRCUIT
V+ V+
Voltage
1 2
4 3
5 6
LIN RIN
Lch Input Rch Input
1.15V
400 400 100k VREF
V+
6p
V+
V+
6p
V+
20k
3 4 9
2 1 12
4 3 14
LOUT ROUT LMON
Lch Output Rch Output Filter terminal
12k
1.15V
6p
V+
V+
5 6 7 8
16 15 14 13
2 1 16 15
NFSPR NFHPR NFSPL NFHPL
Filter terminal Filter terminal Filter terminal Filter terminal
20k
400
6p
1.15V
V+
V+
10
11
13
PS
Filter terminal
400 400 6p 6p
20k
1.15V
-5-
NJM2705
sTERMINAL DESCRIPTION
PIN No.
FFP 16 PCSP 16 SSOP 16
SYMBOL
FUNCTION
EQUIVALENT CIRCUIT
Voltage
V+
V+
V+
11 12
10 9
12 11
SW2 SW1
Mode control switch Mode control switch
0V
700 25k 275k
V+ V+
13
8
10
STBY
Standby switch
700 75k 225k 3p
3p
0V
14
7
9
V+
Power Supply
V+
15
6
8
GND
GND
0V
V+
V+
V+
16
5
7
VREF
Reference voltage
300k
1.15V
400 400 6p 6p
-6-
300k
NJM2705
sAPPLICATION CIRCUIT (FFP16)
1) 2SP mode, HP mode
SW1 100k SW2 0.027 100k
1
1
0.0047
12
11
10
9
SW1 STBY 10
14 V+ 13 STBY
SW2
PS
LMON NFHPL 8
MAX
HP VR 50kB
MAX
MIN
NFSPL 7 4.7k
0.0033 SP VR 50kB
MIN
V+
15 GND
NFHPR 6 4.7k
16 VREF
NFSPR 5 LIN
1
RIN
2
LOUT
3
ROUT
4
Lch IN 0.1
0.0047
0.0033
1
Rch OUT
Rch IN 0.1
Lch OUT
2) 1SP mode, HP mode
SW1 100k
SW2 0.027 100k
1
1
0.0047
12
11
10
9
SW1 STBY 10
14 V+ 13 STBY
SW2
PS
LMON NFHPL 8
MAX
HP VR 50kB
MAX
MIN
NFSPL 7 4.7k
0.0033 SP VR 50kB
MIN
V+
15 GND
NFHPR 6 4.7k
16 VREF
NFSPR 5 LIN
1
RIN
2
LOUT
3
ROUT
4
Lch IN 0.1
0.0047
1
Rch OUT
Rch IN 0.1
Lch OUT
Surround signal is outputted from LOUT terminal at 1SP mode.
-7-
NJM2705
sAPPLICATION CIRCUIT (PCSP16)
1) 2SP mode, HP mode
SW2 0.027 100k SW1 100k
9
1
0.0033
0.0047
12
11
10
LMON
13 NFHPL
PS
SW2
1
SW1 STBY 8 10 STBY
HP VR 50kB
MAX
MAX
MIN
14 NFSPL
V+ 7 V+
MIN
50kB
4.7k
15 NFHPR
SP VR
GND 6
4.7k
16 NFSPR
VREF 5 1 LOUT
2
0.0047
0.0033
ROUT
1
RIN
3
LIN
4
Rch OUT 0.1
Lch IN
Lch OUT 0.1
Rch IN
2) 1SP mode, HP mode
SW2 0.027 100k
SW1 100k
9
1
0.0033
0.0047
12
11
10
LMON
13 NFHPL
PS
SW2
1
SW1 STBY 8 10 STBY
HP VR 50kB
MAX
MAX
MIN
14 NFSPL
V+ 7 V+
MIN
50kB
4.7k
15 NFHPR
SP VR
GND 6
4.7k
16 NFSPR
VREF 5 1 LOUT
2
0.0033
ROUT
1
RIN
3
LIN
4
Rch OUT 0.1
Lch IN
Lch OUT 0.1
Rch IN
Surround signal is outputted from LOUT terminal at 1SP mode.
-8-
NJM2705
sAPPLICATION CIRCUIT (SSOP16)
SP VR 50kB
MAX MIN MIN
1) 2SP mode, HP mode
4.7k
HP VR 50kB
MAX
4.7k NFSPL 16 0.0033
1
HFHPR
0.0047 NFSPR NFHPL 15
2
0.0033 Rch OUT ROUT LMON 14
0.0047
3
Lch OUT
4
LOUT
PS 13 0.027
Rch IN 0.1 Lch IN 0.1
5
RIN
SW2 12 100k 1
SW2
6
LIN
SW1 11 100k 1
SW1
7
VREF
STBY 10 10
STBY
1 GND V+ 9 V+
8
2) 1SP mode, HP mode
SP VR 50kB
MAX MIN MIN
4.7k
HP VR 50kB
MAX
4.7k NFSPL 16 0.0033
1
HFHPR
0.0047 NFSPR NFHPL 15
2
0.0047 Rch OUT ROUT LMON 14 1 0.027 Rch IN 0.1 Lch IN 0.1 VREF STBY 10 10
8
3
Lch OUT
4
LOUT
PS 13
5
RIN
SW2 12 100k 1
SW2
6
LIN
SW1 11 100k 1
SW1
7
STBY
1 GND V+ 9 V+
Surround signal is outputted from LOUT terminal at 1SP mode.
-9-
NJM2705
sTYPICAL CHARACTERISTICS
Operating Current vs. Operating Voltage (STANDBY)
Ta=25 C 1
o
Operating Current vs. Temperature (STANDBY)
V+=3V 20
0.8 Operating Current [A]
15 Operating Current [A]
0.6
10
0.4
5
0.2
0 0 1 2 3 4 5 6 7
0 -50
-25
0
25
50
75
100
125
Operating Voltage [V]
Ta [oC]
Operating Current vs. Operating Voltage (ACTIVE)
Ta=25oC 1000
Operating Current vs. Temperature (ACTIVE)
V+=3V 1000
800 Operating Current [A]
Operating Current [A]
800
600 Bypass,2SP,HP,1SP mode
600 Bypass,2SP,HP,1SP mode
400
400
200
200
0 0 1 2 3 4 5 6 7
0 -50
-25
0
25
50 Ta [oC]
75
100
125
Operating Voltage [V]
Reference Voltage vs. Operating Voltage
Ta=25oC 3.5 3 2.5 1.3
Reference Voltage vs. Temperature
V+=3V
1.25 Reference Voltage [V]
Reference Voltage [V]
1.2
2 1.5
1.15
1.1
1 0.5 0 0 1 2 3 4 5 6 7
1.05
1 -50
-25
0
25
50
75
100
125
Operating Voltage [V]
Ta [oC]
- 10 -
NJM2705
sTYPICAL CHARACTERISTICS
Maximum Input Voltage vs. Operating Voltage (BYPASS)
f=1kHz, RL=10k, THD=1%, Ta=25oC 10
Maximum Input Voltage vs. Operating Voltage (2SP)
Ta= 25oC, f=100Hz SP_VR=MAX, RL=10k, THD=1% -5
Maximum Input Voltage [dBV]
5 Maximum Input Voltage [dBV]
-10
0 Vin=Lch Vout=Lch -5 Vin=Rch Vout=Rch
-15 Vin=Lch Vout=Lch -20 Vin=Rch Vout=Rch
-10
-25
-15 0 1 2 3 4 5 6 7
-30 0 1 2 3 4 5 6 7
Operating Voltage [V]
Operating Voltage [V]
Maximum Input Voltage vs. Operating Voltage (HP)
Ta=25 C, f=100Hz, HP_VR=MAX, RL=10k ,THD=1%
o
Maximum Input Voltage vs. Temperature (1SP)
Ta= 25oC, f=100Hz, SP_VR=MAX, RL=10k THD=1% , -5
-5
Maximum Input Voltage [dBV]
Maximum Input Voltage [dBV]
-10
-10
-15 Vin=Lch Vout=Lch -20 Vin=Rch Vout=Rch
-15 Vin=Lch Vout=Lch -20 Vin=Rch Vout=Lch
-25
-25
-30 0 1 2 3 4 5 6 7
-30 0 1 2 3 4 5 6 7
Operating Voltage [V]
Operating Voltage [V]
Maximum Input Voltage vs. Temperature (BYPASS)
V+=3V, f=1kHz, RL=10k THD=1% 0
Maximum Input Voltage vs. Temperature (2SP)
V+=3V, f=100Hz, RL=10k SP_VR=MAX, THD=1% -15 Vin=Lch Vout=Lch
Maximum Input Voltage [dBV]
Maximum Input Voltage [dBV]
-1
Vin=Lch Vout=Lch
-16 Vin=Rch Vout=Rch -17
-2 Vin=Rch Vout=Rch -3
-18
-4
-19
-5 -50
-25
0
25
o
50
75
100
125
-20 -50
-25
0
25
o
50
75
100
125
Ta [ C]
Ta [ C]
- 11 -
NJM2705
sTYPICAL CHARACTERISTICS
Maximum Input Voltage vs. Temperrature (HP)
V+=3V, f=100Hz, RL=10k HP_VR=MAX, THD=1% -15 Vin=Lch Vout=Lch
Maximum Input Voltage vs. Temperature (1SP)
V+=3V, f=100Hz, RL=10k SP_VR=MAX, THD=1%
-12
Maximum Input Voltage [dBV]
Maximum Input Voltage [dBV]
-16 Vin=Rch Vout=Rch -17
-13 Vin=Rch Vout=Lch -14
-18
-15
Vin=Lch Vout=Lch
-19
-16
-20 -50
-25
0
25
o
50
75
100
125
-17 -50
-25
0
25
o
50
75
100
125
Ta [ C]
Ta [ C]
Output Noise Voltage vs. Temperature
V+=3V, Rg=0, Vout=Lch SP_VR=MAX, HP_VR=MAX, FILTER=A-Weighted -90 -90
Output Noise Voltage vs. Temperature
V+=3V, Rg=0, Vout=Rch SP_VR=MAX, HP_VR=MAX, FILTER=A-Weighted
-95 Output Noise Voltage [dBV] Output Noise Voltage [dBV] 2SP mode -100 HP mode -105 1SP mode -110 Bypass
-95 2SP mode -100
-105
HP mode
-110 Bypass
-115
-115
-120 -50
-25
0
25
50
75
100
125
-120 -50
-25
0
25
50
75
100
125
Ta [oC]
Ta [oC]
Total Harmonic Distortion vs. Input Voltage (BYPASS)
V+=3V, Vin=Lch, f=1kHz, Vout=Lch RL=10k, BW=10Hz-80kHz 10
Total Harmonic Distortion vs. Input Voltage (2SP)
V+=3V, Vin=Lch, f=100Hz, Vout=Lch RL=10k, BW=10Hz-80kHz, SP_VR=MAX 10
1 1 THD+N [%] Ta=25 oC Ta=-20oC THD+N [%] 0.1 0.01 Ta=75oC 0.1
Ta=-20 oC Ta=25 oC Ta=75 oC
0.001 -50
-40
-30
-20
-10
0
0.01 -50
-40
-30
-20
-10
0
Input Voltage [dBV]
Input Voltage [dBV]
- 12 -
NJM2705
sTYPICAL CHARACTERISTICS
Total Harmonic Distortion vs. Input Voltage (HP)
V+=3V, Vin=Lch, f=100Hz, Vout=Lch RL=10k , BW=10Hz-80kHz, HP_VR=MAX 10
Total Harmonic Distortion vs. Input Voltage (1SP)
V+=3V, Vin=Lch, f=100Hz, Vout=Lch RL=10k, BW=10Hz-80kHz, SP_VR=MAX 10
1 THD+N [%] THD+N [%] 0.1 Ta=-20oC Ta=25oC Ta=75oC 0.01
1
0.1
Ta=-20oC Ta=25oC Ta=75oC 0 0.01 -50 -40 -30 -20 -10 0
-50
-40
-30
-20
-10
Input Voltage [dBV]
Input Voltage [dBV]
Frequency Responce (BYPASS)
V+=3V, Vin=-20dBV Lch, Vout=Lch RL=10k, Rg=25 1 20
Frequency Responce (2SP)
V+=3V, Vin=-20dBV Lch, Vout=Lch RL=10k, Rg=25, SP_VR=MAX Ta=75oC Ta=25oC 15
0.5 Ta=-20oC
Gain [dB]
0
Gain [dB]
Ta=-20,25,75 oC
10
5
-0.5 0
-1 10 100 1000 Frequency [Hz] 10
4
10
5
-5 10 100 1000 Frequency [Hz] 10
4
10
5
Frequency Responce (2SP)
V+=3V, Vin=-20dBV Lch, Vout=Lch RL=10k, Rg=25, SP_VR=MIN 20 90
Phase vs. Frequency (2SP)
V+=3V, Vin=-20dBV, Lch+Rch RL=10k, Rg=25, SP_VR=MAX
15 0
Phase [dB]
Gain [dB]
10
-90
Ta=-20,25,75 oC Vout=Rch
5
Ta=75oC Ta=25oC
-180 0 Ta=-20 oC
Ta=-20,25,75 oC Vout=Lch
-5 10 100 1000 Frequency [Hz] 10
4
10
5
-270 10 100 1000 Frequency [Hz] 10
4
10
5
- 13 -
NJM2705
sTYPICAL CHARACTERISTICS
Frequency Responce (HP)
V+=3V, Vin=-20dBV Lch, Vout=Lch RL=10k, Rg=25, HP_VR=MAX 20 Ta=75oC Ta=25oC 15 Ta=-20oC Gain [dB] Gain [dB] 10 10 15 20
Frequency Responce (HP)
V+=3V, Vin=-20dBV Lch, Vout=Lch RL=10k, Rg=25, HP_VR=MIN
5
5
Ta=75 oC Ta=25 oC
0
0
Ta=-20 oC
-5 10 100 1000 Frequency [Hz] 10
4
10
5
-5 10 100 1000 Frequency [Hz] 10
4
10
5
Frequency Responce (1SP)
V+=3V, Vin=-20dBV, Vout=Lch RL=10k, Rg=25, SP_VR=MAX 15 Vin=Lch Ta=75oC Ta=25oC Ta=-20oC 10
Frequency Responce (1SP)
V+=3V, Vin=-20dBV, Vout=Lch RL=10k,Rg=25 , VR=MIN
10
5 Vin=Lch Ta=75 oC Ta=25oC Ta=-20oC
Gain [dB]
0
Vin=Rch Ta=75 oC Ta=25 oC Ta=-20oC
Gain [dB]
5
0
-5 Vin=Rch Ta=-20oC Ta=25oC -10 Ta=75oC
-5
-10 10 100 1000 Frequency [Hz] 10
4
10
5
-15 10 100 1000 Frequency [Hz] 10
4
10
5
[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.
- 14 -

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