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參數(shù)資料
| 型號： | STV9118 |
| 廠商： | 意法半導體 |
| 英文描述： | LOW-COST I2C CONTROLLED DEFLECTION PROCESSOR FOR MULTISYNC MONITOR |
| 中文描述： | 低費用的I2C可控撓度多同步顯示器處理器 |
| 文件頁數(shù)： | 31/46頁 |
| 文件大?。?/td> | 577K |
| 代理商： | STV9118 |
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STV9118
31/46
The frequency range in which the AGC loop can
regulate the amplitude also depends on this ca-
pacitor.
The C- and S-corrections of shape serve to com-
pensate for the vertical deflection system non-line-
arity. They are controlled via
CCOR
and
SCOR
I
2
C bus controls.
Shape-corrected sawtooth with regulated ampli-
tude is lead to amplitude control stage. The dis-
charge exponential is replaced by
V
VOB
level,
which, under control of the CONTROLLER, cre-
ates a rapid falling edge and a flat part before be-
ginning of new ramp. Mean value of the waveform
output on pin
VOut
is adjusted by means of
VPOS
I
2
C bus control, its amplitude through
VSIZE
I
2
C
bus control. Vertical moiré is superimposed.
Figure 11.
Vertical section block diagram
The biasing voltage for external DC-coupled verti-
cal power amplifier is to be derived from
V
RefO
voltage provided on pin
RefOut
, using a resistor di-
vider, this to ensure the same temperature drift of
mean (DC) levels on both differential inputs and to
compensate for spread of
V
RefO
value (and so
mean output value) between particular devices.
10.4.2 - Vertical moiré
To blur the interaction of deflection lines with CRT
mask grid pitch that can generate moiré pattern,
the picture position is to be alternated at half-frame
frequency. For this purpose, a square waveform at
half-frame frequency is superimposed on the out-
put waveform’s DC value. Its amplitude is adjusta-
ble through
VMOIRE
I
2
C bus control,.
2
Synchro
Polarity
Controller
Discharge
22
Sampling
Sampling
Capacitance
S-correction
CCOR
C-correction
18
23
V
VOB
sawtooth
discharge
REF
Charge current
Transconductance amplifier
(I
2
C)
SCOR (I
2
C)
20VAGCCap
VSIZE (I
2
C)
VMOIRE (I
2
C)
VPOS (I
2
C)
19
VOscF
VOut
VEHTIn
VCap
VSyn
OSC
Cap.
Q1
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