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CIRCUIT DESCRIPTION
5. Analog IC : LC7538JM (X08- [A/3], IC8)
5-1. Pin connection
LROUT
1
RROUT
LFOUT
2
RFOUT
LFIN
3
RFIN
LVREF
4
RVREF
L1dBOUT
5
R1dBOUT
L1dBIN
6
R1dBIN
L5dBOUT
i.e
R5dBOUT
LCT2
8
RCT2
LCT1
NY
RCT1
L5dBIN
x
R5dBIN
LTOUT
S
RTOUT
LT3
RT3
LT2
RT2
LT1
RT1
RTIN
AVss
Vss
CL
LTIN
Vppb
CE
DI
5-2. Pin function
[No
[Name
[VO| Function
LROUT
O | Output terminal of fader.
-
|NC
LFOUT
1 | Intput terminal of fader.
Common terminal of main volume
control, fader volume control and
tone control.
Output terminal of 1dB step at-
tenuator of main volume control.
Input terminal of 1dB step attenu-
ator of main volume control.
Output terminal of 5dB step at-
tenuator of main volume control.
L1dBOUT
L5dBOUT
A-58/68
Function
LCT2, LCT1
0: |
Loudness terminal.
L5dBIN
Input terminal of 5dB step attenu-
ator of main volume control.
Output terminal of tone control.
12~14]
LT3~LT1
Terminal to connect BASS and
TREBLE
compensation
capacitor
for tone control circuit.
Intput terminal of tone control.
= =}
= oO
-|
Oo
Connect power supply.
Chip enable terminal. Data are
written in the internal latch and
each analog switch works when
"H" changes to "L".
Data transfer is set enable when
at "H".
Input terminal for serial data and
clock for control.
VDD
CE
18, 19]
Dl, CL
, 21 | Vss, Avss
2
RTIN
23~25 | RT1~RT3
2
RTOUT
27
| R5dBIN
8, 29 | RCT1, RCT2
30
| R5dBOUT
| 22
ho
fer)
Connect each power supply.
Intput terminal of tone control.
Terminal to connect BASS and
TREBLE compensation capacitor
for tone control circuit.
Output terminal of tone control.
Input terminal of 5dB step attenu-
ator of main volume control.
Output terminal of 5dB step at-
tenuator of main volume control.
Input terminal of 1dB step attenu-
ator of main volume control.
WwW
Output terminal of 1dB step at-
tenuator of main volume control.
W W
Common terminal of main volume
control, fader volume control and
tone control.
nN
w B is)
2
Intput terminal of fader.
Ww ol
Ww o
Output terminal of fader.
17
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