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- XL-MXG9BK
MYM7121C(IC841)
1. Outline
YM7121 is a C-MOS LSI for signal processing and servo control (SVC) in a CD player. It is used for the
demodulation of the EFM signal from the laser pick up , detection / correction of the error signal ,
signal processing in digital filtering , etc. and for various servo controls (focusing , disc , tracking and
feed servos).
And. it contains digital interface which output the audio digital signals in S-RAM and CD- player. This
digital interface matches EIAJ standards.
2. Top View
=f
a
eee
-
YM7121C
SLVL
PCO
1/2VPLL VPLL
RV
CVCK.
VDD
VSS
IC
EFMI
Siice level
contro!
¥Cco
rock oneal
oscillator
rock oneal
contral
TESTE
TEST ,D
TEST ,IN
aoe
DM+ ,DM— go
Pee eo
a
FCS ck
Focus servo
control
FZC, FRE [_]
¢——-——L]oin
| | DOuT
#COM interface
es
Time difference
Rew
r
calculation circuit
SVOF
, TRBK [_]
a
| i wa
TROF .TRGL,.TRHD [1]
PscK
;
. Tracking servo
Ld
.
pLe anh
=n
control -
LIS
HF, TER [_
| XIN
ee
ee
servo
FEM+ , FEM~ , FEOF
| Petes
|
clock
a e
ee
} ee esclato
sarees
DATA, DSY |_|
Timing control
1 Xrsy
;
EFM
|
ae
P Senciueed
|
eee
|
buffer
C1,C2Error detection /.
a
I
;
correction
eee
processing
ag CDROM
To~T10 [_]
> $8,DGL,DGR
ca
|
—
RAM
aren
eae
control
a L/R,
WDCK
SDO , SDSY, 2, DTFLG Ct
DAC OUTPUT INTERFACE
|_| DF 00
sDI LF
Hf] DF 01
I
L
se
LI DEP
_
diate i
DAC QUTPUT INTERFACE }——pel
J pip
ee
re
el
el
el
|
1-4(No. 20436)
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