SAMSUNG Max945 Special Circuit Descriptions
Circuit Descriptions
4. Circuit Descriptions
4-1 RF
4-1-1 RIC1 (KS1461)
KS1461 is combined with KS1452 and KS1453 as bipolar IC developed for DVD SERVO system.
Main features include DVD waveform equalizing, CD waveform equalizing, focus error signal generation, 3-beam
tracking error signal generation, DPD 1-beam tracking error, defect, envelope, MIRR output, etc. after receiving the
pick-up output converted into I/V.
4-2-1 (a) Basic Potentiometer
KS1461 uses a single power method and each circuit is based on V of 2.5V.
V (Pin 12, 20, 24, 67) terminal is needed for IC, which uses the peripheral V.
4-2-1(b) RF signal
Fig. 4-1shows the flow of signal generated by the pick-up.
A, B, C, D signals detected from pick-up are converted in to RF signal(A+B+C+D) via RF summing AMP.
104
PICK-UP
RFAGCO EQIN
104
A
B
C
D
EFLDPD
104
104
104
5
6
7
8
13
14
15
16
17
18
RE SUM
& AGC
DPD
TE
TE
ABCD
SUM
FE
474
TESEL
Mhx
ENV
FOK
DEFECT
MIRRI
RF EG
MIRR
57
86
36
40
39
43
46
55
54
33
MIRR
RFEQO
TE
ABCDI
103
ABCD
ENV
FOKB
DFCT2
DFCT1
FE
28
29
ALPC
Fig. 4-1
Fig. 4-2 shows the waveform-equalizing block diagram for the RF signal.
It outputs to EQout (Pin 86) terminal by initially changing switching AMPgain of DVD and CD, and then adjusting the level in RF SUM & AGC. It controls RF SUM & AGC gain by means of Pin 89-95 and interfaces with PWM
signal, (output from PWM terminal of KS1453, via low-pass filter to adjust boost gain and peak frequency.
EQout terminal is connected with EQin (Pin 86).
Samsung Electronics 4-1
Circuit Descriptions
474
REAGCO 8
The control parameters of DVD EQ and CD EQ are as follows.
9 RFEQO
?
EQIN
.
RF EQ
EQG
Fig. 4-2
EQF
PWM1
¡
PLLGF
PWM2
Æ
VZOCTL
VREFEQ
,
RFDVCC
1) DVD CD EQ control parameter
˛EQG (Pin 97) : Changes the gain of peak frequency with EQ frequency characteristic. Convert PWM signal,
output from KS1453, into DC via low-pass filter.
«EQF (Pin 98) : Changes the peak frequency with EQ frequency characteristic. Convert PWM signal, output
from KS1453, into DVD via low-pass filter.
4-2 Samsung Electronics
Circuit Descriptions
Samsung Electronics 4-3
4-2 System Control
4-2-1 Outline
The main micom peripheral circuit is composed of 16bit Micom (MIC1 ; TMP93CM41F), 8M EPROM (MIC8 ; AM27C080) for Microcode and data save, 512 byte EE-PROM (MIC5 ; KS24C020) for permanent storage of data needed at
power off, MIC4 (74AC573) to latch only address in the bus where address and data are mixed, address decoder
(MIC7 ; 74HC00) for selection of ex-ternal device chip and 20MHz clock oscillator for micom operation. The Micom
(MIC1 ; TMP93CM41F) mounted in main board analizes the key commands of front panel or instructions of remote
control through communication with Micom (FIC1 ; LC86P6232) of front and controls the devices on board to execute the corresponding commands after initializing the devices connected with micom on board at power on.
4-2-2 Block Diagram
RIC1
RF AMP
KS1461
SIC1
DIGITAL SERVO
KS1452
VIC1
A/V DECODER
ZIVA-3
VIC50
VIDEO ENCODER
SAA7128/7120
AIC1,2,3,4
D/A CONVERTER
AK4324
DIC1
DATA PROCESSOR
KS1453
MIC2
ADDR LATCH
74AC573
MIC1
MAIN MICOM
TMP93CM41F
MIC8
EPROM
AT27C080
MIC5
EEPROM
KS24C020
MICOM
BLOCK
HIGH ADDRESS
LOW ADDRESS
DATA BUS
UIC1
FRONT MICOM
LC86P6548
MIC7
ADDR DECODER
74HC00
Fig. 4-3
Circuit Descriptions
4-4 Samsung Electronics
4-2-3 Waveform Description
When micom accesses each device sharing bus, it falls the chip select signal of corresponding chip to (CS2:MIC8-22,
/DSPCS:DIC1-2, /DVDCS:VIC1-206/SRVCS:SIC1-10) 0 (Low) before trial.
So to speak, the bus is used by time-division as shown in Fig 4-4, 4-5, 4-6.
Two and more devices can't be accessed simultaneously.
• CH1 : CS2 (MIC8-22, EPROM CHIP SELECT)
• CH2 : DSPCS (DIC1-2, DATA PROCESSOR CHIP SELECT)
• CH3 : DVDCS (VIC1-206, A/V DECODER CHIP SELECT)
• CH4 : SRVCS (SIC1-10, DIGITAL SERVO CHIP SELECT)
• CH5 : WR (MIC1-73, MICOM OUTPUT WRITE SIGNAL)
• CH6 : RD (MIC1-72, MICOM OUTPUT READ SIGNAL)
/CS2
/DSPCS
/DVDCS
/SRVCS
/RD
/WR
Fig. 4-4
• CH1 : CS2 (MIC8-22, EPROM CHIP SELECT)
• CH2 : DSPCS (DIC1-2, DATA PROCESSOR CHIP SELECT)
• CH3 : DVDCS (VIC1-206, A/V DECODER CHIP SELECT)
• CH4 : SRVCS (SIC1-10, DIGITAL SERVO CHIP SELECT)
• CH5 : WR (MIC1-73, MICOM OUTPUT WRITE SIGNAL)
• CH6 : RD (MIC1-72, MICOM OUTPUT READ SIGNAL)
/CS2
/DSPCS
/DVDCS
/SRVCS
/RD
/WR
Fig. 4-5
Circuit Descriptions
Samsung Electronics 4-5
• CH1 : CS2 (MIC8-22, EPROM CHIP SELECT)
• CH2 : DSPCS (DIC1-2, DATA PROCESSOR CHIP SELECT)
• CH3 : DVDCS (VIC1-206, A/V DECODER CHIP SELECT)
• CH4 : SRVCS (SIC1-10, DIGITAL SERVO CHIP SELECT)
• CH5 : WR (MIC1-73, MICOM OUTPUT WRITE SIGNAL)
• CH6 : RD (MIC1-72, MICOM OUTPUT READ SIGNAL)
/CS2
/DSPCS
/DVDCS
/SRVCS
/RD
/WR
Fig. 4-6
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