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參數(shù)資料
| 型號(hào)： | TDA9109S |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | LOW-COST DEFLECTION PROCESSOR FOR MULTISYNC MONITORS |
| 中文描述： | 低費(fèi)用偏轉(zhuǎn)處理器多同步監(jiān)測(cè)儀 |
| 文件頁數(shù)： | 22/30頁 |
| 文件大小： | 266K |
| 代理商： | TDA9109S |
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III.2- I
2
C Control Adjustments
S and C correction shapes can then be added to
this ramp. These frequency independentS and C
corrections are generated internally. Their ampli-
tudesare adjustableby their respective I
2
C regis-
ters. Theycan alsobe inhibitedby theirselect bits.
Finally, the amplitude of this S and C corrected
ramp can be adjusted by the vertical ramp ampli-
tudecontrol register.
Theadjusted rampis availableon Pin23 (V
OUT
) to
drive an externalpower stage.
The gain of this stage can be adjusted (
±
25%)
dependingon its registervalue.
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-V
±
300mV.
UsuallyVOUTis sentthrough a resistivedivider to
the inverting input of the booster. Since VPOS
derives from V
REF-V
, the bias voltage sent to the
non-invertinginput of the booster should also de-
rivefrom V
REF-V
to optimizethe accuracy(seeAp-
plicationDiagram).
III.3- VerticalMoiré
By using the vertical moiré, VPOS can be modu-
latedfromframeto frame.Thisfunctionis intended
tocancelthefringeswhichappearwhenlineto line
intervalis very close to the CRTvertical pitch.
The amplitude of the modulation is controlled by
register VMOIRE on sub-address 0C and can be
switched-offvia the control bit D7.
III.4- Basic Equations
Infirstapproximation,the amplitudeoftherampon
Pin23 (VOUT) is :
V
OUT
- VPOS= (V
OSC
- V
DCMID
)
(1 + 0.25(V
AMP
))
with:
- V
DCMID
= 7/16
V
REF
(middle value of the ramp
on Pin22, typically 3.5V)
- V
OSC
= V
22
(rampwith fixed amplitude)
- V
AMP
= -1for minimumverticalamplituderegister
value and+1 formaximum
- VPOSis calculatedby : VPOS= V
DCMID
+ 0.3V
P
with V
P
equals -1 for minimum vertical position
registervalue and +1 for maximum
The current available on Pin 22 is :
I
OSC
=
3
8
V
REF
C
OSC
f
with: C
OSC
: capacitorconnectedon Pin 22 and
f : synchronizationfrequency.
III.5 - GeometricCorrections
The principle is representedin Figure 16.
Startingfromthe vertical ramp,a parabola-shaped
currentis generatedforE/Wcorrection(alsoknown
as Pin Cushion correction), dynamic horizontal
phase control correction, and vertical dynamicFo-
cus correction.
The parabola generator is made by an analog
multiplier, the output current of which is equal to :
I = k
(V
OUT
- V
DCMID
)
2
whereVOUTis theverticaloutputramp(typically be-
tween2and5V)andV
DCMID
is3.5V(forV
REF-V
= 8V).
Onemoremultiplierprovidesa currentproportional
to (V
OUT
- V
DCMID
)
4
for cornercorrection.
The VOUTsawtooth is typically centeredon 3.5V.
By changing the vertical position, the sawtooth
shiftsby
±
0.3V.
In orderto havegoodscreengeometryforany end
user adjustment, the TDA9109/SN has the ”ge-
ometry tracking” feature, which allows generation
of a dissymetric parabola depending on the verti-
cal position.
Due to thelarge output stage voltage range (E/W,
Keystone, Corner), the combination of tracking
function with maximum vertical amplitude, maxi-
mum or minimum vertical position and maximum
gain on the DAC control may lead to the output
stage saturation. This must be avoided by limiting
the output voltage with apropriate I
2
C registers
values.
FortheE/Wpartandthe dynamichorizontalphase
controlpart, asawtooth-shapeddifferentialcurrent
in the followingform is generated:
I’ = k’
(V
OUT
- V
DCMID
)
Then
I and
I’ are added and converted into
voltagefor the E/W part.
Each of the three E/W components, and the two
dynamichorizontalphasecontrolsmaybeinhibited
by their own I
2
C select bit.
The E/W parabola is available on Pin 24 via an
emitter follower output stage which has to be bi-
ased by an external resistor (10k
to ground).
Sincestable in temperature,the devicecan be DC
coupled with an externalcircuitry.
The vertical dynamic focus is availableon Pin 10.
The dynamichorizontalphasecontrol drives inter-
nally the H-position, moving the HFLYposition on
the horizontalsawtooth in the range of
±
1.4% T
H
both for side pin balance and parallelogram.
OPERATINGDESCRIPTION
(continued)
TDA9109/SN
22/30
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