Samsung DVD-V5600, Service Manual

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Circuit Operating Descriptions
13-44
Samsung Electronics
13-12 DVD RF
(1) RIC1 (SP3723D)
The main furction of this IC is control the DVD RF signal by egualization.
This IC has a function “(laser power control). This function makes a RF signal to generate a RF signal from
pickoup by stable control. And the communication with U1(main micom) make it distirguish the disc and check sev-
eral signal ; tracking , defect , etc...
(a) Basic
SP3723D 5V/3.3V and reference Voltage1.5V.
(b) RF signal
DVDRFP
DVDRFN
BYP
DI
N
FNP
FNN
RX
A
C
FE
PI
SUM
Amp.
RF
A
C
RFSIN
DFT
SIGR
b3
VPA
VPB VN
A VN
B
RFCR b6
1
1
Offse
t cance
l
PIOR b4-0
PI
offset
AGC
HOLD
INPUT IMP
SEL
LPF
B
D
w/
LPF
70kH
z
70kHz PII
w/
LPF
w/
LPF
w/
LPF
B + D
A + C
INPUT
SEL
INPUT IMP
SEL
RFCR
b3
RFCR b4
CCR b4-0
FE offset
5
+/- 6dB
4bit
4
AT
O
P
AT
O
N
4
SIGR b7-4
ATT
AI
N
AI
P
CAR b3
HLDEN
DI
P
MMON
FOCR b3-0
FO
Gain
RFCR b5
OUTPUT
INHIBIT
MUX
DEFECT
RFDCM
ML
P
F
MIR
R
Btm clamp
& Top clip
TOP HLD
droop rate control
11. MRCR b7-0
ATT
ATT
MUX
MUX
MUX
MUX
MP MB
COMP
CCR b7
DISK DET
CBR b3-2
MRCR2 b3
MUX
MRCR2 b7-5
CBR b5
CER b7-5
CBR b6
Vref
CCR b7
DISK DET
1. PDCR b3
15. CCR b7
DiskDet: 0dB
DVD: 12dB
CD: 6dB
MRCR2 b2-1
Hys
MIN
MRCR2 b4
CDR b5-2
Mirr Comp
Offset sel
PIO
PI
I
MNTR
FE
RFDCM
V165
V33/3
4
FOCR b7-4
P
I
TE
MON
SEL
VRC2
RFDCM
CD_E
CD_F
+-3dB
RFCR b2-0
V165
VC
VCI for servo
input
for TE,FE & CE output
ref.
CAR b1
NC
CAR b0
for PI output ref.
VC
V33/3 V33/2
TE
A2
B2
C2
D2
EQ
Comp.
3
2
RFCR b2-0
Single/Dual
TRCR2 b6-5
DPD EQ
VC
CD/DVD
PDCR b3
12dB is added
@high gain mode
TRCR b6
CP/CN
Low
Imp
PIOR b7
LPF
MUX
Offset
cancel
GCA
3
TRCR b2-0
TR
Gain
TRCR b5-
0 TR
offset
6
GCA EQ
GCA EQ
GCA EQ
GCA EQ
PHASE
DETECTOR
PHASE
DETECTOR
SDEN
SCLK
V33
V33 for Output
buff
CONTROL
Signals
To each block
SDATA
SERIAL PORT
REGISTER
DVDLD CD
LD
DVDPD
CDPD
LD H/L
APC SEL
DVD/CD
CAR b2
CCR b5
LDON
Dual APC
Offset
Cancel
GCA
4D
SUM
GCA
GCA
GCA
GCA
GCA
3
GCA
DiskDET
High gain
CCR b6
18/24dB
GAIN
COMP
GCA Offset cancel LPF
Programmable
Equalizer
Filter
FCCR b6-0
FBCR b4-0
12
INPUT
BIAS
Full Wave
Rectifier
AGC Charge
Pump
ATT
MUX
AGC
BTM HLD
TOP ENV
BTM ENV
BTM HLD2
DB
CP
CN
Mirr DFT On/Off
CBR b0
Offset
cancel
TRCR 2 b7-3
4D SUM offset
5
5
4
TRCR b7-6
4D SUM GCA
Gain
@high gain mode
SIGR b2-0
(CDR b5=1)
12dB is added
@high gain mode
SIGR b2-0
(CDR b5=1)
12dB is added
TRCR b6
6dB is added
@high gain mode
Fig. 13-41
This diagram shows the flow of signal generated by the pickup. A, B, C, D signals detected from pickup are
converted in to RF syral (A+B+C+D) via rf summing AMP.