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參數(shù)資料
| 型號： | KA2511B |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | DEFLECTION PROCESSOR FOR MULTISYNC MONITORS |
| 中文描述： | 偏轉(zhuǎn)處理器多同步監(jiān)測儀 |
| 文件頁數(shù)： | 25/35頁 |
| 文件大?。?/td> | 337K |
| 代理商： | KA2511B |
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KB2511B DEFLECTION PROCESSOR FOR MULTISYNC MONITORS
24
free running frequency(fo) adjustment.
Sending the desired fo on the sync input and progressively decreasing the free running frequently I
2
C register
value(address 02), the HLOCKOUT Pin will go high as soon as the proper setting is reached. Setting the free run-
ning frequency this way allows to fully exploit the KB2511B horizontal frequency range.
HORIZONTAL PART
Internal input conditions
Horizontal part is internally fed by synchro processor with a digital signal corresponding to horizontal synchro
pulses or to TTL composite input.
concerning the duty cycle of the input signal, the following signals (positive or negative)may be applied to the
circuit.
Using internal integration, both signals are recognized on condition that Z/T < 25%, synchronisation occurs on the
leading edge of the internal sync signal. The minimum value of Z is 0.7
μ
s.
Figure 6.
An other integration is able to extract vertical pulse of composite synchro if duty cycle is more than 25% (typically
d = 35%)
(7)
Figure 7.
The last feature performed is the equalizing pulses removing to avoid parasitic pulse on phase comparator input
which is intolerent to wrong or missing pulse.
PLL1
The PLL1 is composed of a phase comparator, an external filter and a voltage control oscillator (VCO).
The phase comparator is a phase frequency type designed in CMOS technology. This kind of phase detector
avoids locking on false frequencies. It is followed by a charge pump, composed of two current sources sunk and
sourced (I = 1mA typ. when locked, I = 140mA when unlocked). This difference between lock/unlock permits a
smooth catching of horizontal frequency by PLL1. This effect is reinforced by an internal original slow down system
when PLL1 is locked avoiding horizontal too fast frequency change.
The dynamic bahaviour of the PLL is fixed by an external filter which integrates the current of the charge pump.
A CRC filter is generally used (see figure 8 )
Z
T
Z
d
d
c
TRAMEXT
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