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參數(shù)資料
| 型號： | KB2512 |
| 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)： | 33/36頁 |
| 文件大?。?/td> | 365K |
| 代理商： | KB2512 |
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DEFLECTION PROCESSOR FOR MULTISYNC MONITORS KB2512
32
I
2
C Control Adjustments
Then, S and C correction shapes can be added to this ramp. This frequency independent S and C corrections are
generated internally. Their amplitude are adjustable by their respective I
2
C register. They can also be inhibited by
their select bit. The amplitude of this S and C corrected ramp can be adjusted by the vertical ramp amplitude
control register. The adjusted ramp is available on pin 23 (VOUT) to drive an external power stage. The gain of this
stage is typically 25% depending on its register value. The mean value of this ramp is driven by its own I
2
C register
(vertical position). Its value is VPOS = 7/16
V
REF
±
300mV.
Usually VOUT is sent through a resistive divider to the inverting input of the booster. Since VPOS derives from
V
REF-V
, the bias voltage sent to the non-inverting input of booster should also derive from V
REF-V
to optimize the
accuracy (see application diagram).
Basic Equations
In first approximation, the amplitude of the ramp on pin 23 (Vout) is:
V
OUT
- VPOS = (V
OSC
- V
DCMID
)
(1 + 0.25 (V
AMP
) )
with:
V
DCMID
= 7/16
V
REF
(typically 3.5V, the middle value of the ramp on pin 22)
V
OSC
= V22 (ramp with fixed amplitude)
VAMP = - 1 for minimum vertical amplitude register value and +1 for maximum
VPOS is calculated by: VPOS = V
DCMID
+ 0.3Vp with Vp equals -1 for minimum vertical position register value
and +1 for maximum
The current available on pin 22 is:
with C
OSC
: capacitor connected on pin 22
f: synchronization frequency.
Vertical Moire
By using the vertical moire, VPOS can be modulated from frame to frame. This function is intended to cancel the
fringes which appear when line to line interval is very close to the CRT vertical pitch. The amplitude of the
modulation is controlled by register VMOIRE on address OC and can be switched - off via the control bit D7.
I
OSC
=
V
REF
C
OSC
f
8
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