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. 4-1 shows 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.
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104 |
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RFAGCO |
474 EQIN MIRRI |
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A |
104 |
5 |
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MIRR |
57 MIRR |
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PICK-UP |
B |
104 |
6 |
RE SUM |
RF EG |
86 |
RFEQO |
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C |
104 |
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7 |
& AGC |
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D |
104 |
8 |
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TESEL |
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PD LD F |
E |
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DPD |
Mhx |
36 TE |
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TE |
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TE |
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14 |
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ABCDI |
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15 |
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ABCD |
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103 |
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39 |
ABCD |
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SUM |
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ENV |
43 ENV |
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FOK |
46 FOKB |
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55 DFCT2 |
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DEFECT |
54 DFCT1 |
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FE |
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33 FE |
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28 |
ALPC |
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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 AMP gain 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
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474 |
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EQIN |
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RF EQ |
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REAGCO 89 |
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RFEQO |
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Æ |
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EQG |
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EQF |
PLLGF |
VZOCTL |
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PWM1 |
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PWM2 |
VREFEQ |
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RFDVCC |
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Fig. 4-2
The control parameters of DVD EQ and CD EQ are as follows.
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
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 |
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RIC1 |
SIC1 |
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DIC1 |
VIC1 |
VIC50 |
AIC1,2,3,4 |
RF AMP |
DIGITAL SERVO |
DATA PROCESSOR |
A/V DECODER |
VIDEO ENCODER |
D/A CONVERTER |
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KS1461 |
KS1452 |
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KS1453 |
ZIVA-3 |
SAA7128/7120 |
AK4324 |
UIC1 |
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MIC1 |
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MIC2 |
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FRONT MICOM |
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MAIN MICOM |
ADDR LATCH |
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LC86P6548 |
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TMP93CM41F |
74AC573 |
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MIC7 |
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ADDR DECODER |
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DATA BUS |
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74HC00 |
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MIC5 |
MIC8 |
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EEPROM |
EPROM |
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MICOM |
KS24C020 |
AT27C080 |
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BLOCK |
HIGH ADDRESS |
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LOW ADDRESS |
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Fig. 4-3 |
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Samsung Electronics |
4-3 |
Circuit Descriptions
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.
/CS2
/DSPCS
/DVDCS
/SRVCS
/WR
/RD
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
/WR
/RD
Fig. 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)
4-4 |
Samsung Electronics |
Circuit Descriptions
/CS2
/DSPCS
/DVDCS
/SRVCS
/WR
/RD
Fig. 4-6
•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)
Samsung Electronics |
4-5 |
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