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參數(shù)資料
| 型號： | TDA9105A |
| 廠商： | 意法半導(dǎo)體 |
| 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)： | 19/31頁 |
| 文件大?。?/td> | 340K |
| 代理商： | TDA9105A |
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OPERATING DESCRIPTION
(continued)
Geometric Corrections
The principle is representedin Figure20.
Figure 21 :
Geometric Corrections Principle
VDCIN
VDCIN
EW Amp
Vertical
Ramp
Keystone
EW
Output
Corner
X
2
Vertical
Dynamic
Focus
Output
VDCIN
Sidepin Amp
Key Balance
Side Pin
Balance
Output
X
2
Analog
Multiplier
9
Startingfrom the verticalramp, a parabolashaped
isgeneratedforE/Wcorrection,dynamichorizontal
phasecontrol correction, and vertical dynamicFo-
cuscorrection.
The core of the parabola generator is an analog
multiplier. The output current of which is equal to :
I = k (V
RAMP
- V
DCIN)2
.
Where V
RAMP
is the vertical ramp, typically com-
prised between 2 and 5V, V
DCIN
is a vertical DC
inputadjustablein the range3.2V
→
3.8Vin order
to generate a dissymmetric parabola if required
(keystoneadjustment).
Inorderto keepgoodscreengeometryfor anyend
user preferences adjustment we implemented the
possibilitytohave“
geometrytracking
”.Toenable
the “tracking” function, the V
DCOUT
must be con-
nected to V
DCIN
.
It is possible to inhibit V
POS
trackingby applying a
fixedDC voltageon the V
DCIN
Pin.
This DC voltage in that case must be taken from
thevertical referenceand adjustedto3.5V with an
externalbridge resistor.
Due to large output stages voltage range (E/W,
BALANCE, FOCUS), the combination of tracking
function with maximum vertical amplitude max. or
min.verticalpositionand maximumgain ontheDC
controlinputsmay leadsto theoutputstagessatu-
ration. This must be avoided by limiting the output
voltageby apropriateDC control voltages.
ForE/WpartandDynamicHorizontalphasecontrol
part, a sawtooth shaped differential current in the
followingformisgenerated:
I’=k’(V
RAMP
-V
DCIN
).
Then
I and
I’ are addedtogetherand converted
into voltage.
For E/Wpart cornerpurpose, the following current
form is generatedand added before voltage con-
version
I” = k” (V
RAMP
- V
DCIN
)
4
.
These two parabola are respectively available on
Pin37 and Pin 40by the wayof an emitterfollower
which has to be biased by an external resistor
(10k
). They can be DC coupled with external
circuitry.
EW
V
OUT
= 2.5V+ K
1
’ (V
RAMP
- V
DCIN
)
+ K
1
(V
RAMP
- V
DCIN
)
2
+ K
1
“ (V
RAMP
- V
DCIN
)
4
K
1
is adjustableby EW amp control (Pin 39)
K
1
’ is adjustableby KEYSTcontrol (Pin 38)
Dyn.Hor.
PhaseControl
+ K
2
(V
RAMP
- V
DCIN
)
K
2
is adjustableby SPB amp control (Pin 42)
K
2
’ is adjustableby KEYBALcontrol(Pin 41)
For vertical dynamic focus part, only a constant
amplitude parabola is generatedin the form :
V
OUT
= 6V- 0.75 x (V
AMP
- V
DCIN
)
2
.
Theoutputconnectionis thesameasthetwoother
corrections(Pins 37-40).
It is important to note that the parasitic parabola
during the discharge of the vertical oscillator ca-
pacitor is suppressed.
V
OUT
= 4V + K
2
’ (V
RAMP
- V
2
)
TDA9105A
19/31
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