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CXA2560Q (IC401) : Dolby B type noise reduction system with play back equalizer amp.
1.Pin layout & block diagram
30
29
28
27
7k/12k
PBFB2
31
PBRIN2
32
300k
-
PBGND
33
+
F2
PBFIN2
34
30k
VCT
35
45k
PBREF
36
30k
PBFIN1
37
F1
+
PBGND
38
-
300k
PBRIN1
39
7k/12k
PBFB1
40
1
2
3
4
2. Pin function
I/O
Pin No. Symbol
Playback equalizer amplifier
1
PBTC1
-
capacitance
Playback equalizer amplifier
2
PBOUT1
O
output
Output reference
3
OUTREF1
O
TAPE input
4
TAPEIN1
I
Power supply
5
Vcc
-
6
NC
-
Line output
7
OUT1
O
Time constant for the HLS
8
TCH1
-
9
NC
-
Cut-off frequency adjustment
10
MSLPF
-
of the music sensor LPF
Music signal interval detection
11
G2FB
-
Music signal interval detection
12
G1FB
-
Time constant for detecting
13
MSTC
-
music signal interval
Music sensor out
14
MSOUT
O
No use
15
NC
-
Dolby NR control
16
NRSW
I
Mute function control
17
MUTE
I
Playback equalizer amplifier
18
METAL
I
control
Head select control
19
DRSW
I
Music sensor mode control
20
I
DIRECTION
Music sensor control
21
FF/REW
I
22
NC
-
Time constant for the HLS
23
TCH2
-
Line output
24
OUT2
O
26
24
23
22
21
25
NR
20
FF/REW
100k
OFF/B
19
DIRECTION
T2
MS MODE
1
BIAS
18
METAL
MUTE
MUTE
17
TAPE EQ
16
NRSW
NR MODE
FWD/RVS
15
NC
Vcc
MS ON/
OFF
LPF
+
14
MSOUT
-
DET
F3
13
MSTC
1
T1
G1FB
12
OFF/B
100k
11
G2FB
NR
5
6
7
8
9
10
Function
I/O
Pin No.
Symbol
25
DIREF
-
Resistance for setting the
reference
26
GND
-
Ground
27
TAPEIN2
I
TAPE input
28
OUTREF2
O
Output reference
29
PBOUT2
O
Playback equalizer amplifier
output
30
PBTC2
-
Playback equalizer amplifier
capacitance
31
PBFB2
I
Playback equalizer amplifier
feedback
32
PBRIN2
I
Playback equalizer amplifier
input
33
PBGND
-
Playback equalizer amplifier
ground
34
PBFIN2
I
Playback equalizer amplifier
input
35
VCT
O
Center
36
PBREF
O
Playback equalizer amplifier
reference
37
PBFIN1
I
Playback equalizer amplifier
input
38
PBGND
-
Playback equalizer amplifier
ground
39
PBRIN1
I
Playback equalizer amplifier
input
40
PBFB1
I
Playback equalizer amplifier
feedback
KW-XC828
Function
1-37
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