![background image](http://html.mh-extra.com/html/lg/drd-820b/drd-820b_manual_211110018.webp)
23
IC201 (TA1254F) : RF Signal Processing for CD/DVD
It amplifies or equalize the RF signal from Pick-up, and generate the TE (Tracking Error) and FE
(Focus Error) signal for Servo respectively.
The TE signal uses the DPD (Differential Phase Detect) method for DVD and 3 Beam method for
CD.
DVD FE=(A+C)-(B+D)
CD FE=A-B
Block Diagram
MAJOR IC INTERNAL BLOCK DIAGRAM AND PIN
DESCRIPTION
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
P1FN
P1FP
LDP1
P1DI
P1CI
P1BI
P1AI
GNDR
LDP2
P2AI
P2BI
P2CI
P2DI
GNDS
P2FP
P2FN
DPDB
VccR
NC
NC
RFO
RPP
RPB
RPO
RPZ
VccS
DFTN
FEO
TEO
LVL
VccP
VCKF
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
9
10
11
12 13
14
15
16
GND
P2TP
P2TN
LDO2
MDI2
VrA
VrD
Vdd
DPAC
DPBD
DPD1
DPD2
SCB
SCL
SCD
VRCK
48
NC
P1TP
P1TN
LDO1
MDI1
EQF
EQB
RFA
RFDC
GND2
EQD
NC
Vcc2
PSC
FEB
TEB
47
46
45 44
43
42 41 40
39
38
37 36
35
34
33
APC1
R-gain
Adjustment
sel-RF
sel-PD
sel-PD
sel-PD
sel-FE
mode-IC
sel-TE
sel-DPD
sel-LVL
mode-TE
F-gain
Adjustment
F-gain
Adjustment
T-gain
Adjustment
Generating
3BTE
APC2
Generating
DPDTE
Generating
FE
Generating
RF Ripple
EQ
FE-gain
Adjustment
TE-gain
Adjustment
LEVEL
Detection
Time Constant
Adjustment
BUS