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參數(shù)資料
| 型號： | KB9224 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | VIDEO-CD 2ND GENERATION |
| 中文描述： | 視頻-環(huán)糊精第二代 |
| 文件頁數(shù)： | 45/55頁 |
| 文件大?。?/td> | 450K |
| 代理商： | KB9224 |
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VIDEO-CD 2ND GENERATION
KB9224
45
Focus Offset Adjust
MICOM sends the Focus Offset Adjust Command $842 to start the adjustment. In the Focus Error Amp Final
output block, the Focus output is compared with the 1/2 Vdd. If the Focus Error Amp output goes above 1/2 VDD,
the Focus offset adjust is completed. The Focus Offset Adjusts voltage change per step is about 40 mv. Transition
is carried out 1 step at a time from 320 mv to -320 mv by the total 4-bit resistance DAC, and after completion, about
+20 mvdml of Offset is added to 1/2 step. Normally, the Offset distribution after Focus Offset adjust exists between
-20 mv ~ +20 mv. The design is such that after Focus Offset, you have the option to vary the Focus by turning On
the switch that connects the exterior and interior of the Focus block (pin 63).
When Febias block is Open, the Focus Error Offset is the same as Febias Adjust Offset. The time spent per step is
5.8 ms, and since there are 4 bits, a total of 16 steps and maximum 128 ms can be spent. Also, Lens-collision-
sounds can be generated when adjusting the pick-up with a sensitive Focus Actuator, so the Time division that
uses 46 ms per step, spending a total of 736 ms, is used. That is carried out by setting the $86Xs lowest D0 bit to
0. The Adjustment is carried out by Hardware, and it goes from Minus Offset to Plus Offset.
For Febias Offset Readjust, 4-bit DAC is Reset by $878, and Reset can be canceled only when the $87F-applied
D2 bit goes from 0 --> 1.
In order to prevent system errors such as static electricity, the Focus DAC Latch Blocks Reset is not carried out by
the RESET block (System Reset), but by MICOM DATA.
FEBIAS Adjust
FEBIAS OFFSET is automatically adjusted from 0 mV, and can be adjusted from the exterior at +/-100 mV. When
adjusting the FEBIAS at 0 mV ~ +100 mV, Rx connect to VDD, and if adjusting the FEBIAS at -100 mV ~ 0 mV, Rx
connect to GND.
After FEBIAS OFFSET automatic adjust is complete, the FEBIAS external resistance and FOCUS ERROR internal
resistance is connected, so adjusting Pin 63 (FEBIAS) to an optional OFFSET value is possible.
Rx
VDD (5 V)
FEBIAS
Rx
FEBIAS
Rx
4 K
VDD/2
* Application when adjusting offset from
0 mV ~ +100 mV
Optional Offset Voltage
(Voff)
VDD/2
* Application when adjusting offset from
-100 mV ~ 0 mV
VDD - VDD/2
( Rx + 4 K )
= Voff
Example) When Power is 5 V
( 5 - 2.5 ) V
( Rx + 4 K )
4 K = Voff
10 K
( Rx + 4 K )
= Voff
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