NJW1136GL1 NJRC [New Japan Radio], NJW1136GL1 Datasheet - Page 12

• Manufacturer Part Number: NJW1136GL1
• Description: AUDIO PROCESSOR with Subwoofer Output
• Manufacturer: NJRC [New Japan Radio]

NJW1136
(12/24)
I I I I LPF Characteristics
The NJW1136 includes the LPF for subwoofer output and bass boost function. The LPF consists of primary and
secondary LPF and it is enable to adjust “cut off frequency”, “Q” and “Roll off”.
The expression of LPF characteristics is as follows.
-10
-15
-20
-5
5
0
C1=33nF
<Primary LPF>
<Secondary LPF>
<LPF Frequency Response>
f
f
C1=22nF
c
c
C1=15nF
1
2
=
=
C2 = 47nF, C3 = 22nF
2
2
π
42
π
Frequency [kHz]
Primary LPF
*
9 .
1
R
C
∗
0.1
*
2
10
C
∗
1
C
−
6
=
3
R=24k
C1
2
LF1
C1=68nF
π
C1=47nF
*
24
Q =
*
1
10
2
Secondary LPF
−
+
-
3
. 1
1
*
46
C
1
*
gm1
-10
-15
-20
C2
-5
C
5
0
C
LF2
3
2
C2=47nF
C2=100nF
LPF Block Diagram
C2=68nF
Q
1
=
0
5 .
+
0.1
-
C1 = 33nF, C
Fr
gm2
C3
LF3
C2=33nF
C
2
1
-10
-15
-20
-5
5
0
C3=22nF
+
-
C3=15nF
C3=10nF
C1 = 33nF, C2 = 47nF
Frequency [kHz]
0.1
C3=33nF
C3=47nF
1