1-26 (No.49875)
6.4
CXA2560Q (IC401) : Dolby B type noise reduction system with play back equalizer amp.
• Pin layout & block diagram
• Pin function
PBFB2
PBRIN2
PBGND
PBFIN2
VCT
PBREF
PBFIN1
PBGND
PBRIN1
PBFB1
MSMODE
DRSW
TAPESW
MUTESW
NRSW
MSOUT
MSTC
G1FB
G2FB
PBTC2
PBOUT2
OUTREF2
T
A
PEIN2
GND
DIREF
LINEOUT2
TCH2
NC
MSSW
PBTC1
PBOUT1
OUTREF1
T
A
PEIN1
Vcc
NC
LINEOUT1
TCH1
NC
MSLPF
1
2
3
4
5
6
7
8
9
10
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
31
32
33
34
35
36
37
38
39
40
7k/12k
300k
F2
F1
30k
30k
45k
300k
7k/12k
F3
OFF/B
100k
T1
-
+
+
-
70 /120
1
1
T2
100k
OFF/B
NR
NR
BIAS
MUTE
TAPE EQ
FWD/RVS
LPF
+
-
DET
Vcc
MS MODE
NR MODE
MS ON/
OFF
-
+
NC
+
-
70 /120
Pin No.
Symbol
I/O
Function
1
PBTC1
-
Playback equalizer amplifier
capacitance
2
PBOUT1
O
Playback equalizer amplifier
output
3
OUTREF1
O
Output reference
4
TAPEIN1
I
TAPE input
5
Vcc
-
Power supply
6
NC
-
7
LINEOUT1
O
Line output
8
TCH1
-
Time constant for the HLS
9
NC
-
10
MSLPF
-
Cut-off frequency adjustment
of the music sensor LPF
11
G2FB
-
Music signal interval detection
12
G1FB
-
Music signal interval detection
13
MSTC
-
Time constant for detecting
music signal interval
14
MSOUT
O
Music sensor out
15
NC
-
No use
16
NRSW
I
Dolby NR control
17
MUTESW
I
Mute function control
18
TAPESW
I
Playback equalizer amplifier
control
19
DRSW
I
Head select control
20
MSMODE
I
Music sensor mode control
21
MSSW
I
Music sensor control
22
NC
-
23
TCH2
-
Time constant for the HLS
24
LINEOUT2
O
Line output
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
Pin No.
Symbol
I/O
Function