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NJM2706
3D Surround Audio Processor with Dynamic Bass Boost
s GENERAL DESCRIPTION The NJM2706 is the 3D surround audio processor with dynamic bass boost, regenerates rich sound field with only small two speakers. The NJM2706 performs NJRC original surround technology realizing natural surround sound field regarded center orientation and NJRC original dynamic bass boost technology provides graceful bass sound with low distortion. It is suitable for mini-component, CD radio-cassette, TV, speaker system and others. s PACKAGE OUTLINE
NJM2706VE1
NJM2706M
NJM2706L s FEATURES q Operating Voltage +4.7V to +13.0V q Wide Dynamic Range 3.1Vrms typ. q Low Output Noise 8.9Vrms typ. q "eala" 3D Surround Function (Stereo only) q Dynamic Bass Boost Function q High Frequency Compensation (f=10kHz, GV=+3dB) q Variable Surround Effect by external resistor q Internal Mode Control Switch q Bipolar Technology q Package Outline DMP24, SSOP24, SDIP30
s BLOCK DIAGRAM (DMP24, SSOP24)
24
23
22
21
20
19
18
17
16
15
14
13
L
SW
HP
H
Vref 50K 3D FILTER
H L SW SW H:eala L:BYPASS SW H:eala_Bass L:BYPASS
LPF
VC
H L
SW
HP 50K
H L
SW
1
2
3
4
5
6
7
8
9
10
11
12
50K
50K
-1-
NJM2706
s PIN CONFIGURATION
DMP24, SSOP24 (Top View)
1 2 3 4 5 6 7 8 9 10 11 12
24 23 22 21 20 19 18 17 16 15 14 13
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12.
LPF MIN MOUT Ca Cr BASSFIL1 BASSFIL2 BASSVRIN BASSVROUT ealaVRIN ealaVROUT GND
13. V+ 14. VREFOUT 15. VREFIN 16. SW1 17. SW2 18. ealaFIL 19. HFFILL 20. HFFILR 21. ROUT 22. LOUT 23. RIN 24. LIN
SDIP30 (Top View)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15.
LPF MIN N.C. MOUT Ca Cr BASSFIL1 N.C. BASSFIL2 BASSVRIN BASSVROUT ealaVRIN N.C. ealaVROUT GND
16. V+ 17. VREFOUT 18. N.C. 19. VREFIN 20. SW1 21. SW2 22. ealaFIL 23. N.C. 24. HFFILL 25. HFFILR 26. ROUT 27. LOUT 28. N.C. 29. RIN 30. LIN
-2-
NJM2706
sABSOLUTE MAXIMUM RATING (Ta=25C)
PARAMETER Supply Voltage Power Dissipation Operating Temperature Range Storage Temperature Range SYMBOL V
+
RATINGS 15 (SDIP30) 700 (DMP24) 700 (SSOP24) 600 -40 to +85 -40 to +125
UNIT V mW C C
PD Topr Tstg
sOPERATING VOLTAGE
PARAMETER Operating Voltage
SYMBOL
TEST CONDITION -
MIN 4.7
TYP 12.0
MAX 13.0
UNIT V
V+
sELECTRICAL CHARACTERISTICS (Ta=25C, V+=12V unless otherwise specified)
TEST CONDITION PARAMETER Operating Current Reference Voltage
SYMBOL
INPUT L R 0 0 0 0 0 0
+
OUT PUT
MODE
eala VR
Bass VR
MIN 5.8
TYP 15.4 15.4 6.0
MAX 23.0 23.0 6.2
UNIT
ICC Vref
No Signal No Signal
-
Bypass Bass -
MAX -
-
mA V
qAC CHARACTERISTICS (Ta=25C, V =12V, VIN=-20dBV(100mVrms) unless otherwise specified)
TEST CONDITION PARAMETER Maximum Input Voltage
SYMBOL
INPUT L R VIN VIN VIN VIN VIN 0 0 0 0 VIN VIN VIN VIN VIN f=1kHz THD=3% f=100Hz THD=3% f=1kHz THD=3% f=10kHz THD=3% f=100Hz THD=3% VIN VIN VIN VIN VIN 0 0 0 0 VIN VIN VIN VIIN VIN -
OUT PUT
MODE
eala VR
Bass VR
MIN 10.0 (3.2) 7.8 (2.5) 3.4 (1.5) -
TYP 12.0 (4.0) 6.0 (2.0) 7.9 (2.5) 9.8 (3.1) 5.4 (1.9) -110 (3) -98 (13) -100 (10) -97 (14) 0.005 0.05 0.05 0.05
MAX
UNIT
VIM
L R *1 L R L R L R L R L R L R L R L R L R L R L R
Bypass Bass eala eala Bass eala Bass Bypass Bass eala eala Bass Bypass Bass eala eala Bass
MAX MAX MAX MAX MAX MAX MAX
MAX MAX MAX MAX MAX MAX MAX
-100 (10) -92 (25) 0.01 % 0.5 dBV (Vrms) dBV (Vrms)
Output Noise
VNO
Rg=0 A-Weighted Rg=0 A-Weighted Rg=0 A-Weighted Rg=0 A-Weighted
Total Harmonic Distortion
THD
f=1kHz f=100Hz f=1kHz f=1kHz
*1:BASSVR2OUT
-3-
NJM2706
qAC CHARACTERISTICS (Ta=25C, V =12V, VIN=-20dBV(100mVrms) unless otherwise specified)
TEST CONDITION PARAMETER
SYMBOL
+
INPUT L R VIN VIN VIN VIN VIN VIN VIN VIN VIN
+
OUT PUT
MODE
eala VR
Bass VR
MIN
TYP
MAX
UNIT
Bypass Gain eala Gain
GVBYP Geala
f=1kHz f=100Hz f=100Hz f=1kHz f=1kHz f=100Hz f=10kHz
VIN VIN VIN VIN VIN VIN VIN VIN VIN -
L R L R L R L R L R L R L R
Bypass Bass Bass eala eala eala Bass eala Bass
MAX MIN MAX MAX
MAX MIN MAX MAX
-1.0 4.4 -2.0 2.1 -2.0 5.9 0.0
0.0 6.4 0.0 4.1 0.0 7.9 2.0
1.0 8.4 2.0 6.1
dB
dB 2.0 9.9 4.0
qCONTROL CHARACTERISTICS (Ta=25C, V =12V, unless otherwise specified)
PARAMETER MODE Select Control Voltage
SYMBOL
TEST CONDITION VIN=High Level VIN=Low Level
MIN 2.0 0.0
TYP -
MAX V
+
UNIT V
VMODE
0.7
sSWITCH FUNCTION
MODE SW2 SW1 NOTES Input Through 3D Surround mode Bass Enhanced mode 3D Surround and Bass Enhanced mode
Bypass eala Bass eala Bass
L L H H
L H L H
-4-
NJM2706
TERMINAL DESCRIPTION No.
DMP24 SSOP24
SYMBOL
SDIP30
FUNCTION
EQUIVALENT CIRCUIT
VOLTAGE
V+
V+
1
1
LPF
Capacitor terminal for LPF
16k
V+/2
150
V+
V+
V+
2
2
MIN
Monaural Amplifier Input
150
20k
V+/2
V+
V+
16k
10k
50
3
4
MOUT
Monaural Amplifier Output
50
V+/2
V+
V+
4 5
5 6
Ca Cr
V+
V+ VCA
10k
Capacitor Terminal for Attack Time Constant Capacitor Terminal for Release Time Constant
0V
100
V+
10k
82k
6
7
BASSFIL1
BASS Filter Terminal 1
150
0V
-5-
NJM2706
TERMINAL DESCRIPTION No.
DMP24 SSOP24
SYMBOL
SDIP30
FUNCTION
EQUIVALENT CIRCUIT
VOLTAGE
V+
V+
V+
V+
50
7 21 22
9 26 27
BASSFIL2 ROUT LOUT
BASS Filter Terminal 2 Rch Output Lch Output
50
V+/2
V+
8
10
BASSVRIN
BASS Effect Adjust Terminal
150
V+/2
V+
V+
V+
9
11
BASSVROUT
BASS Effect Adjust Terminal
150
20k
V+/2
V+
V+
10
12
ealaVRIN
20k
eala Effect Adjust Terminal
150
V+/2
V+
V+
20k
10k
50
11
14
ealaVROUT
eala Effect Adjust Terminal
50
V+/2
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NJM2706
TERMINAL DESCRIPTION No.
DMP24 SSOP24
SYMBOL
SDIP30
FUNCTION
EQUIVALENT CIRCUIT
VOLTAGE
12
15
GND
GND Terminal
0V
13
16
V+
Power Supply Terminal
V+
V+
V+
V+
14
17
VREFOUT
Reference Voltage Output
400 50
50
V+/2
V+
V+
V+
15
19
VREFIN
50k
Reference Voltage Input
V+/2
400
V+
V+
50k
V+
16 17
20 21
SW1 SW2
Mode Switch 1 Mode Switch 2
0V
150 150k
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NJM2706
TERMINAL DESCRIPTION No.
DMP24 SSOP24
SYMBOL
SDIP30
FUNCTION
EQUIVALENT CIRCUIT
VOLTAGE
V+
V+
18
22
ealaFIL
eala Filter Terminal
10k
32k
V+/2
V+
V+
19 20
24 25
HFFILL HFFILR
High Frequency Filter for Lch High Frequency Filter for Rch
15k
V+/2
400
V+
V+
V+
23 24
29 30
RIN LIN
Rch Input Lch Input
V+/2
150 50k VREF
-8-
(SDIP30)
C1 Lch Input
C16
30
1
C1 LPF 10 F C15 10 F C13 Lch Output 10 F C12 10 F R6 C11 30K 560pF R5 C10 Rch Output MIN RIN Rch Input LIN Lch Input C16
LPF
LIN
24
1
0.1F R1 Rch Input
10 F C15 10 F
29
2
20K
MIN
RIN
0.1 F R1
23
2
20K
C13
sAPPLICATION CIRCUIT (DMP24, SSOP24)
28
3
N.C.
N.C.
22
3
27
MOUT 10 F C12
LOUT
Lch Output
MOUT Ca ROUT
LOUT
4
C2
21
C2
4
26
5
10 F
Ca
ROUT
Rch Output C11
1 F C3
20
25
Cr 30K 560pF R5 C10
10 F C4
HFFILR
R6
1 F C3
5
Cr HFFILR
6
10 F C4
19
6
24
0.18 F
BASSFIL1 30K 560pF C9
HFFILL
0.18 F R2
BASSFIL1
HFFILL
7
18
23
8
N.C.
N.C.
7
BASSFIL2
ealaFIL
20K Max Min
30K 560pF C9 0.0047 F R4 C8 10K
R2
BassSW
22
17
9
BASSFIL2
ealaFIL
8
20K
0.0047 F R4
BASSVRIN
SW2
20KB
BassVR
Max
Min
C8 10K
BassSW
10
16
BASSVRIN
SW2
10 F R3 C7 10K BASSVROUT SW1 10 F C6
ealaSW
21
9
BassVR 10 F R3 C7 10K ealaSW
20KB
20
Max Min
11
10 F C6
BASSVROUT
SW1
15
10
ealaVRIN 20KB
VREFIN
Max
Min
19
ealaVR
12
1 F
ealaVRIN
VREFIN
1 F C5
11
14
VREFOUT ealaVROUT
ealaVR
20KB
10 F GND V+ 12V
18
13
C5
N.C.
N.C.
12
13
14
10 F 12V C17 100 F
17
ealaVROUT
VREFOUT
C17 100 F
15 16
GND
V+
NJM2706
-9-
NJM2706
sAPPLICATION NOTE 1. Fine-Tuning the ealaBASS The NJM2706 has quite sophisticated NJRC's original dynamic bass-boost technology. Both of the level and the frequency for bass-boost moves automatically corresponding to the input signal level. This dynamic filtering action prevents the signals over boosted, and provides less distortion and wide dynamic range bass-boost processing. In addition, if you want to fine-tune the bass-boost effect for your system, you can modify the bass-boost effect by changing the external parts value as described below. 1-1. Modify the Boost Center Frequency This plot shows the frequency response for NJM2706 ealaBASS.
Frequency Characteristics (eala Bass)
V+=12V Vin=-20dBVLch Vout=Lch RL=4.7k Rg=25
10
C4=0.1F C4=0.15F C4=0.18F
5
Gain [dB]
0 -5 10 100
1000
10
4
10
5
Frequency [Hz]
The Boost Center Frequency can be adjusted by changing the value for the external capacitor, C4. If your speaker system has more than 100Hz of f0 (= Lower Frequency Response Range), or, if you would like to get more powerful bass-boost effect than the typical settings shown on the page 9, increasing the Boost Center Frequency higher could be a good idea. We strongly recommend you to determine the actual capacitance value by testing and examinations on your actual application. 1-2. Modification for the LPF Cut-off Frequency fCL This picture shows the equivalent circuit for NJM2706's LPF.
R1 20k 20k Lch 20k Rch 16k 1pin C1 0.1 * The pin numbers apply in DMP24 and SSOP24's case. 2pin 3pin LPF
MONO Amp.
The LPF Cut-off Frequency fCL is given by the following equation: 1 1 fCL= 2CR = 2C1x16k Set the fCL as same as the Boost Center Frequency, which is determined as above (The Boost Center Frequency = the frequency of which the gain is +3dB). In the typical application circuit shown on the page 9, the LPF Cut-off Frequency fCL is set to 100Hz.
- 10 -
NJM2706
1-3. Adjusting the Summing Level for ealaBASS effect to L/R Output Signal Changing the resistance value connected between the terminal 8 and 9 can modify the Summing Level for the ealaBASS effect to the L/R Output Signal. 2. Adjusting the High Frequency Compensation Filter The NJM2706 has High Frequency Compensation Filter, which can produce well balance between boosted-bass frequency range and treble frequency range. This picture shows the equivalent circuit for the High Frequency Compensation Filter.
15k
20pin
HFFIL R6 30k C11 560p * The pin numbers apply in DMP24 and SSOP24's case.
The Cut-off Frequency fCH and the Voltage Gain GVH are defined as below: fCH= 1 = 2CR 1 2xC11xR6 GVH= 20log R6+15k R6
In the typical application circuit shown on the page 9, the High Frequency Compensation Filter Cut-off Frequency fCH is set to 10kHz and Voltage Gain GVH is set to 3.5dB.
- 11 -
NJM2706
sTYPICAL CHARACTERISTICS
Supply Current vs. Supply Voltage
V+=1-13V, Ta=25 oC
20
Supply Current vs. Temperature
V+=12V
16 BASS
eala BASS 15
15
Bypass
Supply Current [mA]
14
Supply Current [mA]
BASS 10 eala
13
Bypass
12
5
11
0 0 5 10 Supply Voltage [V] 15 20
10 -50 0 50 100
o
150
Temperature [ C]
Maximum Input Voltage vs. Supply Voltage (Bypass)
Vin=Lch, Vout=Lch, f=1kHz, RL=4.7k , Rg=25, Ta=25 oC
20
Maximum Input Voltage vs. Supply Voltage (BASS)
Vin=Lch+Rch, Vout=BASSVROUT, f=100Hz, RL=4.7k , Rg=25, Ta=25 oC
20
15
15
Maxmum Input Voltage [dBV]
10
Maximum Input Voltage [dBV]
10
5
5
0
0
-5
-5
-10 0 4 8 12 16
-10 0 4 8 12 16
Supply Voltage [V]
Supply Voltagte [V]
Maximum Input Voltage vs. Supply Voltage (eala)
Vin=Lch, Vout=Lch, f=1kHz, RL=4.7k , Rg=25, Ta=25 oC
15
15
Maximum Input Voltage (eala BASS)
Vin=Lch, Vout=Lch, f=10kHz, RL=4.7k , Rg=25, Ta=25 oC
10
10
Maximum Input Voltage [dBV]
Maximum Input Voltage [dBV]
5
5
0
0
-5
-5
-10
-10
-15 0 4 8 12 16
-15 0 4 8 12 16
Supply Voltage [V]
Supply Voltage [V]
- 12 -
NJM2706
s TYPICAL CHARACTERISTICS
Maximum Input Voltage vs. Supply Voltage (eala BASS)
Vin=Lch+Rch, Vout=Lch, f=100Hz, RL=4.7k , Rg=25 Ta=25 oC
15
-90 eala BASS BASS
Output Noise vs. Temperature
V+=12V, Vin=GND, Vout=Lch
10
-95
Maximum Input Voltage [dBV]
5
Output Noise [dBV]
-100 eala -105
0
-5
-110 Bypass -115
-10
-15 0 4 8 12 16
-120 -50 0 50 Temperature [ C]
o
100
150
Supply Voltage [V]
THD+N vs. Input Voltage (Bypass)
10
THD+N vs. Input Voltage (Bypass)
V+=12V, Vin=Lch, Vout=Lch, f=1kHz, RL=4.7k , Rg=25, BW=10-80KHz
10
V+=12V, Vin=Lch, Vout=Lch, f=100Hz, RL=4.7k , Rg=25, BW=10-80kHz
1
1 Ta=85oC
Ta=85oC
THD+N [%]
THD+N [%]
0.1
Ta=25oC Ta=-40oC
0.1 Ta=25oC Ta=-40oC 0.01
0.01
0.001
0.001
0.0001 -50 -40 -30 -20 -10 0 10 20
0.0001 -50 -40 -30 -20 -10 0 10 20
Input Voltage [dBV]
Input Voltage [dBV]
THD+N vs. Input Voltage (Bypass)
10
THD+N vs. Input Voltage (eala)
V+=12V, Vin=Lch, Vout=Lch, f=1kHz, RL=4.7k , Rg=25, BW=10-80kHz
10
V+=12V, Vin=Lch, Vout=Lch, f=10kHz, RL=4.7k , Rg=25, BW=10-80kHz
1 1
Ta=-40oC Ta=25oC Ta=85oC
THD+N [%]
Ta=85oC 0.1 Ta=25 C Ta=-40oC
o
THD+N [%]
0.1 0.01 -10 0 10 20
0.01
0.001 -50 -40 -30 -20
-50
-40
-30
-20
-10
0
10
20
Input Voltage [dBV]
Input Voltage [dBV]
- 13 -
NJM2706
s TYPICAL CHARACTERISTICS
THD+N vs. Input Voltage (eala BASS)
V+=12V, Vin=Lch, Vout=Lch, f=100Hz, RL=4.7k , Rg=25, BW=10-80kHz
10
THD+N vs. Input Voltage (eala BASS)
V+=12V, Vin=Lch, Vout=Lch, f=1kHz, RL=4.7k , Rg=25, BW=10-80kHz
10
1
1
Ta=85 C Ta=25oC Ta=-40oC
o
THD+N [%]
THD+N [%]
Ta=-40oC Ta=25oC 0.1 Ta=85oC
0.1
0.01 -50 -40 -30 -20 -10 0 10 20
0.01 -50 -40 -30 -20 -10 0 10 20
Input Voltage [dBV]
Input Voltage [dBV]
THD+N vs. Input Voltage (eala BASS)
V+=12V, Vin=Lch, Vout=Lch, f=20kHz, RL=4.7k , Rg=25, BW=10-80kHz
10
Gain vs. Frequency (Bypass)
V+=12V, Vin=-20dBV Lch, Vout=Lch, RL=4.7k , Rg=25
3
2 Ta=85oC
1
1
Ta=25oC Ta=-40oC
THD+N [%]
Ta=-40oC Ta=25oC 0.1 Ta=85oC
Gain [dB]
0
-1
-2
0.01 -50 -40 -30 -20 -10 0 10 20
-3 10 100 1000 10
4
10
5
Input Voltage [dBV]
Frequency [Hz]
Gain vs. Frequency (BASS)
V+=12V, Vin=-20dBV Lch+Rch, Vout=Lch, RL=4.7k , Rg=25
12
12
Gain vs. Frequency (eala)
V+=12V, Vin=-20dBV Lch, Vout=Lch, RL=4.7k , Rg=25
10
10
8 Ta=85oC
8 Ta=85oC
Gain [dB]
Gain [dB]
6
Ta=25oC Ta=-40oC
6
Ta=25oC Ta=-40oC
4
4
2
2
0
0
-2 10 100 1000 10
4
10
5
-2 10 100 1000 10
4
10
5
Frequency [Hz]
Frequency [Hz]
- 14 -
NJM2706
s TYPICAL CHARACTERISTICS
Gain vs. Frequency (eala BASS)
V+=12V, Vin=-20dBV Lch, Vout=Lch, RL=4.7k , Rg=25
12
Gain vs. Frequency (eala BASS)
20
10 Ta=85oC 8 Ta=25oC Ta=-40oC
15 -40dBV INPUT 10 Gain [dB] -30dBV INPUT -20dBV INPUT -10dBV INPUT 5 0dBV INPUT
Gain [dB]
6
4
2
0
0
-2 10 100 1000 10
4
-5
10
5
10
100 Frequency [Hz]
1000
10
4
Frequency [Hz]
[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 -

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