Page 1
NJM2192A
PRELIMINARY
SRS TruBass Bass Enhancement Processor
■■■■
GENERAL DESCRIPTION
The NJM2192A is a Bass Enhanc em ent Proces sor,
based on SRS TruBass technology.
The NJM2192A eliminates the need for large
speakers to create low frequency fundamental tones,
and it enhances and complements subwoofer
performance.
The NJM2192A is suitable for audio applications
which are speaker system for mini components, CD
radio cassette, multim edia speak er s ystems, T V and
others.
■■■■
FEATURES
●Operating Voltage 4.7 to 13V
■■■■
PACKAGE OUTLINE
NJM2192AL
●Punch Control
●Internal Bass Gain Control Switch
●Bypass Function (Through)
●Internal Mode Switch
●External Adjustment for Speaker Size (Small, Medium, Large)
●Bipolar Technology
●Package Outline SDIP30, SDMP30
The TruBass technology right incorporated in the
New Japan Radio Co., Ltd. TruBass is protected under U. S. and foreign pat ents is sued and/or pendi ng. TruBass and the
Tel:949-442-1070 Fax:949-852-1099 http://www.srslabs.com
, are trademarks of SRS Labs, Inc. in the United S tates and selected f oreign countries. Neither t he purchase of the
NJM2192A
recordings made with any SRS technology.
SRS Labs requires that all users of the
royalty is not included in the purchase price. SRS Labs also requires any users to com ply with all rul es and regulat ions as
outlined in the SRS Trademark Usage Manual.
For further information, pl ease contact:
, nor the corresponding sale of audio enhancement equipment conveys the right to sell commercialized
SRS Labs, Inc.
2909 Daimler Street. Santa Ana, CA 92705 USA
NJM2192A
NJM2192A
are owned by SRS Labs, a U.S. Corporation and licens ed to
must enter into a license agreement direc tly with SRS Labs if the
NJM2192AM
- 1 –A
Page 2
(✼)
(✼)
NJM2192A
■■■■PIN CONFIGURATION
1
1 0
1 1
1 2
1 3
1 4
1 5
2
3
4
5
6
7
8
9
3 0
1. FILOUT 16. V+
2. FIL1 17. VREFOUT
2 9
2 8
3. FIL2 18. VREFIN
4. FIL3 19. GAINSW
5. FIL4 20. MODE2
2 7
2 6
6. FIL5 21. MODE1
7. FIL6 22. BASSOUT
8. FIL7 23. OUTR
2 5
2 4
2 3
2 2
9. PCOUT 24. OUTL
10. PCIN 25. BASSINR
11. FIL8 26. INR
12. FIL9 27. BASSINL
13. C1 28. INL
14. C2 29. C3
2 1
2 0
1 9
1 8
1 7
1 6
15. GND 30. C4
■■■■
TruBass BLOCK DIAGRAM
INL
INR
BASSINL
BASSINR
50K
VREF
50K
VREF
50K
VREF
50K
VREF
+6dB
+6dB
+6dB
GAIN
SW
Filter
Punch VR
■■■■
SPEAKER SIZE SETTING
The standard setting of speaker size is as follows.(Reference)
•Large Mode : fo ≤ 80Hz
•Medium Mode : 80Hz < fo ≤ 150Hz
•Small Mode : 150Hz < fo ≤ 250Hz
Set the speaker size by TruBass effect of your application.
VCA
VREF
Set the speaker size.
MODE SW
a
b
c
a
b
c
a BYPASS
b BASS2
c BASS1
OUTL
OUTR
BASSOUT
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Page 3
■■■■ABSOLUTE MAXIMUM RATINGS (Ta=25°°°°C)
PARAMETER SYMBOL RATING UNIT
Supply Voltage V+ 15 V
Power Dissipation PD 700 mW
Operating Temperature Range T
Storage Temperature Range T
-40 to +85 °C
opr
-40 to +125 °C
stg
NJM2192A
■■■■ELECTRICAL CHARACTERISTICS (V
PARAMETER SYMBOL
Operating
Voltage
Supply
Current
Reference
V
Voltage
Maximum
Input Voltage
Output Noise
Total
THD
Harmonic
Distortion
BYPASS
GV
Gain
V+
ICC No Signal
REF
VIM
V
NO
f=1kHz
BYP
- - -
+
/2 0 0 -
V
f=1kHz
THD=3%
f=100Hz
THD=3%
Gain “L”
f=100Hz
THD=3%
Gain “L”
Rg=0Ω
A-Weighted
Rg=0Ω
A-Weighted
Gain ”L”
f=1kHz
V
=-10dBV
IN
f=100Hz
Gain “L”
f=100Hz
Gain “L”
+
=12V,Ta=25°C,VIN=-20dBV(100mVrms), Speaker Size : Medium)
TEST CONDITION
IN
L R
OUT
0 0 0 0 0 0 -
V
- L
I N
- V
V
I N
V
I N
V
I N
V
I N
0 0
R
I N
V
L
I N
V
R
I N
V
L
I N
V
R
I N
L
R
L
0 0
R
V
- L
I N
- V
V
I N
V
I N
V
I N
V
I N
V
I N
- V
R
I N
V
L
I N
V
R
I N
V
L
I N
V
R
I N
- L
R
I N
MODE
-
BYPASS
BASS1
BASS2
-
BYPASS
BASS1
BASS2
BYPASS
BASS2
BYPASS
BASS1
BASS2
BYPASS
PUNCH
VR
- 4.7 12.0 13.0 V
- 6.6 11.6 16.6
MAX 6.6 11.6 16.6
MAX 6.6 11.6 16.6
- 5.8 6.0 6.2 V
-
MAX
MAX
- -
MAX -
- - 0.005 0.01
MAX - 0.1 1.0
MAX - 0.1 1.0
- -1.0 0.0 1.0 dB
MIN. TYP. MAX. UNIT
10.7
(3.1)
-6.3
(0.5)
-4.7
(0.6)
11.7
(3.8)
-4.3
(0.6)
-2.7
(0.7)
-105
(5.6)
-94
(20.0)
-
-
-
-98
(12.6)
-88
(40.0)
mA
dBV
(Vrms)
dBV
(uVrms)
%
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Page 4
NJM2192A
■■■■ELECTRICAL CHARACTERISTICS (V
PARAMETER SYMBOL
BASS Gain
Switch
Control
Voltage
GV
VIH 19,20,21pin
V
BASS
19,20,21pin
IL
IN OUT
f=100Hz
Gain “L”
f=100Hz
Gain “L”
f=100Hz
Gain “H”
f=100Hz
Gain “L”
f=100Hz
Gain “H”
■■■■MODE SWITCH FUNCTION
+
=12V,Ta=25°C,VIN=-20dBV(100mVrms), Speaker Size : Medium )
TEST CONDITION
PUNCH
VR
MAX 11.2 13.2 15.2
MIN -18.4 -14.4 -10.4
MAX 15.7 17.7 19.7
MAX 12.8 14.8 16.8
MAX 16.6 18.6 20.6
V
V
I N
V
V
I N
V
V
I N
V
V
I N
V
V
I N
V
V
I N
V
V
I N
V
V
I N
V
V
I N
V
V
I N
L
I N
R
I N
L
I N
R
I N
L
I N
R
I N
L
I N
R
I N
L
I N
R
I N
MODE
BASS1
BASS1
BASS1
BASS2
BASS2
- - - - - 2.0 - V
MIN. TYP. MAX. UNIT
+
- - - 0.0 - 0.7
dB
V
MODE1 MODE2 NOTES
BYPASS (a) L - Input Through
BASS1 (c) H L Low Frequency Content of TruBass
BASS2 (b) H H TruBass Mode
(2)
(1)
(1) BASS1:The output signal is low frequency content of TruBass derived from the stereo audio signal.
(2) BASS2:TruBass Mode.
■■■■BASS INPUT AMP GAIN SWITCH FUNCTION
To Increase the TruBass effect with the GAIN Switch.
GAIN NOTES
Gain Low L Normal Position
Gain High H Gain +6dB
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Page 5
p
(✼)
(✼)
NJM2192A
■■■■INPUT TERMINAL OPERATING INSTRUCTION
NJM2192As input equip 4 terminals INL(28pin), INR(26pin), BASSINL(27pin) and BASSINR(25pin).
“Normal Setting”
Short INL and BASSINL, INR and BASSINR at the normal TruBass mode.
Lch input
Rin input
INL
BASSINL
INR
BASSINR
NJM2192A
OUTL
OUT
TruBass output signal
“Connect to the other surround ICs(TruSurround, SRS, etc.)”
If NJM2192A is used with the other surround ICs, the low f requency signal is possible to be amplified by the
other surround ICs. Then the audio stereo signal input into the BASSIN L/R, and the other surround signal input
into INL/R.
Lch input
Rch in
ut
Passive Matrix
TruSurround
NJM2188
etc.
INL
INR
BASSINL
BASSINR
NJM2192A
OUTL
OUT
“Adjust TruBass effect”
Insert an attenuator before the BASSIN L/R if necessary.
Lch input
INL
R
A
50kΩ
OUTL
OUTR
Input attenuator
Rch input
R
VREF
R
B
A
BASSINL
INR
50kΩ
NJM2192A
50kΩ
R
B
BASSINR
50kΩ
VREF
Set the attenuator : (RA+RB)≥50kΩ
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Page 6
NJM2192A
■■■■PIN DESCRIPTION
NO. SYMBOL FUNCTION EQUIVALENT CIRCUIT VOLTAGE
V+
V+/2
V+
V+/2
10
29
3
30
PCIN
C3
FIL2
C4
PUNCH Control VR
Filter Input
Filter Input
V+
V+
1
17
22
23
24
2 FIL1 Filter Input
FILOUT
VREFOUT
BASSOUT
OUTR
OUTL
Filter Output
Vref Output
TruBass Output
(Low Frequency Content)
Rch Audio Output
Lch Audio Output
V+
V+ V+
50
50
V+ V+ V+
50
50
V+/2
V+/2
- 6 -
Vref
Page 7
NJM2192A
NO. SYMBOL FUNCTION EQUIVALENT CIRCUIT VOLTAGE
4
5
7
6
8
11
FIL3
FIL4
FIL6
FIL5
FIL7
FIL8
Filter Input
Filter Input
V+
V+
50K
150
V+
V+
V+/2
50K
50K
11.6K
V+
V+/2
9
12
13 C1 Filter Input
PCOUT
FIL9
PUNCH Control VR
Filter Output
V+
V+
V+
10K
V+
50
50
V+
V+/2
0V
- 7 -
Page 8
NJM2192A
NO. SYMBOL FUNCTION EQUIVALENT CIRCUIT VOLTAGE
14 C2 Filter Input
18 VREFIN Vref Input
V+
50
10K
50K
50K
V+
V+
V+ V+ V+
0V
V+/2
19
20
21
25
26
27
28
GAINSW
MODE2
MODE1
BASSINR
INR
BASSINL
INL
Gain SW
MODE2 SW
MODE1 SW
Audio Input
V+
150K
50K
Vref
V+
V+ V+ V+
150
V+
150
0V
V+/2
- 8 -
Page 9
NO. SYMBOL FUNCTION EQUIVALENT CIRCUIT VOLTAGE
NJM2192A
15 GND GND
16 V+ V+
0V
V+
- 9 -
Page 10
L
T
7
T
N
9
NJM2192A
■■■■BLOCK DIAGRAM
C4
C3
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
FILTER
INL
BASS
INL
+6dB
de
INR
FILTER
MATRIX
BASS
INR
+6dB
de
d:Nomal
e:+6dB
OUTL
OUTR
BASS
VCA
OUT
MODE 1
a
b
c
a
b
c
MODE 2
GAINSWVREFINVREF
a:BYPASS
b:BASS2
c:BASS1
FILTER
GND
OUT
50K 50K
V+
VREF
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
OU
PC
I
FIL8FIL
FI
OU
FIL1
FIL2FIL3FIL4FIL5FIL6FIL
PC
C1
C2
GND
No. SYMBOL FUNCTION No. SYMBOL FUNCTION
1 FILOUT Filter Output 16 V+ Supply Voltage
2 FIL1 Filter Input 17 VREFOUT V+/2 Output
3 FIL2 Filter Input 18 VREFIN V+/2 Input
4 FIL3 Filter Input 19 GAINSW Gain Switch
5 FIL4 Filter Input 20 MODE2 MODE2 Switch
6 FIL5 Filter Input 21 MODE1 MODE1 Switch
7 FIL6 Filter Input 22 BASSOUT
TruBass Output
(Low Frequency Content)
8 FIL7 Filter Input 23 OUTR Rch Output
9 PCOUT Punch Control VR 24 OUTL Lch Output
10 PCIN Punch Control VR 25 BASSINR TruBass Input
11 FIL8 Filter Input 26 INR Rch Input
12 FIL9 Filter Output 27 BASSINL TruBass Input
(2)
(3)
13 C1 Filter Input 28 INL Lch Input
14 C2 Filter Input 29 C3 Filter Input
15 GND GND 30 C4 Filter Input
(1) The BASSOUT is low frequency signal derived from the stereo audio signal.
(2),(3) Refer to
■■■■
“
INPUT TERMINAL OPERATING INSTRUCTION”
(1)
- 10 -
Page 11
K
NJM2192A
■■■■APPLICATION CIRCUIT(1)
C21
GND
0.01uF
30
C4 C3
FILOUT
1 2
L
VREF
R2 56.2K
R3 3.09K R4 21K
L
VREF
R10 2.32K
R11 22.1K
R6 37.4K
Lch OUT Rch OUT
10uF
C17
C16
23
24
Lch OUT
10uF
Rch OUT
Lch IN
GND
C19
0.1uF
C20
10uF
28
29
INL
Rch IN
10uF
C18
25
26
27
BASSINL
INR
BASSINR
NJM2192A
FIL3
C2
R12 158K
C3 0.1uF
R14 107K
C5 0.1uF
FIL4
0.1uF
SW1
L
R13 57.6
SW2
L
R15 45.3K
FIL5
H
FIL7
FIL6
VREF
C4 0.1uF
H
C6 0.1uF
FIL2
FIL1
3 4 5 6 7 8 9 10 11
C1
0.1uF
SW1
H
R1 13K
SW2
H
R5 8.87K
L
H
MODE1
L
H
MODE2
L
H
GAIN
R8
C14
10uF
20
MODE1
PCIN
PUNCH VR
10K
C13
10uF
19
MODE2
FIL8 FIL9
12
C22
0.01uF
C12
GAINSW
10uF
18
13 14
C7
GND GND
R9 10K
BASS OUT
10uF
C15
21
22
BASSOUT
PCOUT
Max
10KB
Min
R7
10K
VREF
C10
C11
10uF
17
VREFIN
VREFOUT
C2
C1
C8
1uF/
V+
12V
10uF
16
V+
GND
15
10uF
GND
C9
100uF
SW
SW1 H L L
SW2 H H L
LARGE MEDIUM SMALL
SPEAKER SIZE
3 MODE SPEAKER SIZE
MODE2 MODE1
Bypass - L
BASS1 L H
BASS2 H H
FUNCTION SETTING
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Page 12
NJM2192A
■■■■APPLICATION CIRCUIT(2)
GND
0.01uF
C21
30
C4 C3
FILOUT FIL1
1 2
Lch INPUT
GND
C19
0.1uF
C20
29
10uF
28
INL
Rch INPUT
10uF
C18
26
27
INR
BASSINL
Rch OUTPUT
Lch OUTPUT
10uF
10uF
C17
C16
23
24
25
BASSINR
OUTL
OUTR
NJM2192A
FIL2
3 4 5 6 7 8 9 10 11
C1
0.1uF
FIL4
R3
0.1uF
R2
VREF
FIL5
C4
0.1uF
FIL3
C2
0.1uF
C3
R1
FIL7
FIL6
R6
C6
C5
R4
0.1uF
R5
VREF
0.1uF
VREF
L
H
MODE1
L
H
MODE2
L
H
GAIN
R8
R9 10K
BASS OUT
10uF
C15
21
22
BASSOUT
PCOUT
Max
Min
10KB
10K
10uF
19
12
C12
GAINSW
10uF
18
13 14
C7
C13
C14
10uF
20
MODE2
MODE1
PCIN
FIL8 FIL9
C22
0.01uF
PUNCH VR
R1 56.2K 21K 21K
R2 13K 3.09K 3.09K
R3 158K 42K 42K
R4 37.4K 37.4K 22.1K
R5 8.87K 8.87K 2.32K
R6 107K 107K 32K
GND GND
R
LARGE MEDIUM SMALL
R7
10K
VREF
C10
C11
10uF
17
VREFIN
VREFOUT
C2
C1
C8
1uF
10uF
SPEAKER SIZE
10uF
16
15
GND
V+
GND
C9
V+
12V
100uF
- 12 -
Page 13
■BASS1 MODE TYPICAL CHRACTERISITCS
NJM2192(TruBass) GAIN STRUCTURE
“Speaker Size : Small”
dB
+16
+14
+12
+10
+8
+6
+4
+2
+0
-2
-4
-6
-8
-10
20
50
100
200
500
Hz
1k
Vin=-12.2dBV(245mVrms), Lch In → Lch Out, Punch VR : MAX
V+ = 12V
2k
NJM2192(TruBass) GAIN STRUCTURE
“Speaker Size : Medium”
dB
+16
+14
+12
+10
+8
+6
+4
+2
+0
-10
-2
-4
-6
-8
20
50
100
200
500
Hz
1k
2k
5k
5k
NJM2192A
20k
10k
10k
20k
Vin=-12.2dBV(245mVrms), Lch In → Lch Out, Punch VR : MAX
V+ = 12V
- 13 -
Page 14
NJM2192A
+16
+14
+12
+10
+8
+6
+4
dB
+2
+0
-2
-4
-6
-8
NJM2192(TruBass) GAIN STRUCTURE
“Speaker Size : Large”
-10
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
Vin=-12.2dBV(245mVrms), Lch In → Lch Out, Punch VR : MAX
V+ = 12V
- 14 -
Page 15
■■■■BASS2 MODE TYPICAL CHRACTERISITCS
NJM2192(TruBass) GAIN STRUCTURE
“Speaker Size : Small”
+16
+14
+12
a:MAX
+10
+8
+6
+4
dB
+2
+0
-2
-4
-6
-8
b:MIN
NJM2192A
-10
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
Vin=-12.2dBV(245mVrms), Lch In → Lch Out, Punch VR a:MAX, b:MIN
V+ = 12V
NJM2192(TruBass) GAIN STRUCTURE
“Speaker Size : Medium”
+16
+14
+12
dB
+10
+8
+6
+4
+2
+0
-2
a:MAX
b:MIN
-4
-6
-8
-10
20
50
100
200
500
1k
Hz
2k
5k
10k
20k
Vin=-12.2dBV(245mVrms), Lch In → Lch Out, Punch VR a:MAX, b:MIN
V+ = 12V
- 15 -
Page 16
NJM2192A
+16
+14
+12
+10
+8
+6
+4
dB
+2
+0
-2
-4
-6
-8
NJM2192(TruBass) GAIN STRUCTURE
“Speaker Size : Large”
a:MAX
b:MIN
-10
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
Vin=-12.2dBV(245mVrms) Lch In → Lch Out, Punch VR a:MAX, b:MIN
V+ = 12V
[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.
- 16 -
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