VERTICAL PARABOLA GENERATOR WITH
DC CONTROLLED KEYSTONE & AMPLITUDE
.
AUTOTRACKING WITH V-POS& V-AMP
GEOMETRY
.
WAVE FORM GENERATOR FOR PARALELLOGRAM& SIDE PIN BALANCECONTROL
.
AUTOTRACKING WITH V-POS& V-AMP
DYNAMICFOCUS
.
VERTICALPARABOLAOUTPUTFOR VERTICALDYNAMIC FOCUS
.
AUTOTRACKING WITH V-POS& V-AMP
GENERAL
.
ACCEPT POSITIVE OR NEGATIVE HORIZONTAL& VERTICAL SYNC POLARITIES
.
SEPARATE H & V TTLINPUT
.
COMPOSITEBLANKINGOUTPUT
DESCRIPTION
The TDA9105 is a monolithic integrated circuit
assembled in a 42 pins shrink dual in line plastic
package.
This IC controls all the functions related to the
horizontaland vertical deflectionin multimodesor
multisyncmonitors.
This IC, combined with TDA9205 (RGB preamp),
STV942x(OSDprocessor),ST727x(microcontroller) and TDA817x(vertical booster), allowsto realize very simple and high quality multimodes or
multisyncmonitors.
5H-FLYHorizontal Flyback Input (positive polarity)
6H-GNDHorizontal Section Ground
7H-REFHorizontal Section Reference Voltage, must be filtered
8FC2VCO Low Threshold Filtering Capacitor
9FC1VCO High ThresholdFiltering Capacitor
10C0Horizontal OscillatorCapacitor
11R0Horizontal OscillatorResistor
12PLL1FFirst PLL Loop Filter
13H-LOCKCAPFirst PLL Lock/UnlockTime Constant Capacitor. When Frequency ischanging, a Blanking
14PLL1INHIBTTL-Compatible Inputfor PLL1 Output Current Inhibition
15H-POSDC Control for HorizontalCentering
16XRAY-INX-RAY protectionInput (withinternal latchfunction)
17H-SYNCTTL compatible Horizontal Sync Input
18V
CC
19GNDGround
20H-OUTEMHorizontal Drive Output (emiter of internal transistor)
21H-OUTCOLHorizontal Drive Output (open collector of internal transistor)
22BLKOUTBlanking Output, activated during frequency changes, when X-RAYInput istriggered,when
23MOIREMoire Output
24V-GNDVertical Section SignalGround
25V-AGCCAPMemory Capacitor forAutomatic Gain Control Loop in Vertical Ramp Generator
26V-REFVertical Section ReferenceVoltage
27V-CAPVertical Sawtooth GeneratorCapacitor
28VS-AMPDC Control of VerticalS-Shape Amplitude
29C-CORRDC Control of VerticalC-Correction
30V-OUTVertical Ramp Output (with frequency independantamplitude and S-Correction)
31V-AMPDC Control of VerticalAmplitude Adjustment
32VDCOUTVertical Position ReferenceVoltage Output
33V-POSDC Control of VerticalPosition Adjustment
34V-SYNCTTL-Compatible VerticalSync Input
35VDCINGeometric CorrectionReference Voltage Input
36V-FLYVertical Flyback Input (positive polarity)
37EWOUTEast /WestPincushion Correction Parabola Output
38KEYSTDC Control of KeystoneCorrection
39EWAMPDC Control East/West PincushionCorrection Amplitude
40GEOMOUTSide PinBalance & Parallelogram Correction Parabola Output
41KEYBALDC Control of ParallelogramCorrection
42SPINBALDC Control ofSide Pin Correction Amplitude
and VerticalOutputs are inhibited.By connecting a Capacitor onthis Pin aSoft-start function
may berealized on H-drive Output.
Pulse isgenerated on Pin23, the duration of this Pulse is proportionnel to the Capacitoron
Pin 13.
Note : IfH-drive is taken on Pin20 (Pin 21 connectedto supply), H-D is the ratio of low level duration to horizontal period.
IfH-drive is taken on Pin21 (Pin 20 grounded), H-D isthe ratio of high level duration to horizontal period.
In both cases, H-D period drivinghorizontal scanning transistor off.
amb
Fh Min
Fh Max
4<VOFF
=25°C)
)
Highlevel voltage2
= 8V1.6 to 6.2V
REF-H
R0 = 6.49kΩ, C0 = 680pF
See conditions on Fig. 1
f0
3.7 x f0
V
14
V
14
2
2
80ppm
(Pins8-9)
=2V
V
4
=6V
V
4
V
4=VREF
- 100mV
32
53.5
57.5
34
56
60
58.5
62.5
1.11.7V
V
21-V20,IOUT
Pin 21 to V
= 20mA
I
OUT
I
22
with I22= 10mA0.250.5V
V
22
23
with I23= 10mA0.250.5V
23
Vmin
Vmax
V
4
= 20mA
,
CC
9.510V
1.6
3.2
TBD7.5V
0.8V
0.8V
10mA
36
10mA
10mA
1V
kHz
kHz
V
%
%
%
V
V
9105-06.TBL
6/32
TDA9105
VERTICALSECTION
OperatingConditions
SymbolParameterMin.Typ. Max.Unit
VSVRVertical Sync Input Voltage (Pin 34)05.5V
VEWMMaximum EW OutputVoltage (Pin 37)6.5V
VDHPCM Maximum Dynamic Horizontal Phase Control OutputVoltage (Pin 40)6.5V
VDHPCm Minimum Dynamic Horizontal Phase Control Output Voltage (Pin 40)0.9V
VDFmMinimum Vertical Dynamic Focus Output Voltage (Pin 1)0.9V
RloadMinimum Load for less than 1% Vertical Amplitude Drift (Pin 25)65MΩ
Notes : 1. It is the frequency range for which theVERTICAL OSCILLATOR will automatically synchronize, using a single capacitor value on
Bias Current (Pin35) (sourced by PNP base)For V35=V
Pin 27 and with a constantramp amplitude.
2. Typically 3.5Vfor Vertical reference voltage typical value (8V).
32
- 0.5V
REF
2µA
9105-08.TBL
7/32
TDA9105
VERTICALSECTION (continued)
East/WestFunction
SymbolParameterTest conditionsMin.Typ. Max.Unit
EW
TDEW
EW
EW
KeyAdjKeystone AdjustmentCapability :
KeytrackKeystone versus V-POS control
Notes : 1. When Pin36 >V
DC Output Voltage (see Figure 2)V33=4V,V35=V32,V38= 4V2.5V
DC
DC Output Voltage Thermal DriftSee Note 2100ppm/°C
DC
Parabola AmplitudeV28= 2V, V29grounded,
para
Parabola Amplitude versus V-AMP
track
Control (tracking between V-AMP and
E/W)
A/B Ratio (seeFigure 2)
B/A Ratio
(tracking between V-POS and EW)
A/B Ratio
B/A Ratio
-0.5V, Vfly input is inhibitedand vertical blanking on composite blankingoutputis replaced byvertical sawtooth
discharge time.
2. These parameters are not tested on each unit. They are measured during our internal qualification procedure which includes
characterization on batches comming from corners of our processes and also temperature characterization.
REF
= 6V, V33= 4V,
V
31
V
35=V32,V38
V
39
V
39
= 2V, V29grounded
V
28
= 4V, V35=V32,
V
33
= 4V, V39=4V
V
38
V
31
V
31
V
31
= 2V, V29grounded,
V
28
= 6V, V33= 4V,
V
31
V
35=V32,V39
V
38
V
38
= 2V, V29grounded,
V
28
= 6V, V38= 4V,V39=6V
V
31
= 2V, V35=V
V
33
V33= 6V, V35=V
= 4V,
=6V
=2V
=2V
=4V
=6V
=4V
=6V
=2V
32
32
TBD2.9
0
0.36
0.82
1.45
TBD
0.48
TBD
0.48
0.54
0.54
V
V
V
V
V
9105-09.TBL
Dynamic Horizontal PhaseControl Function
SymbolParameterTest ConditionsMin.Typ.Max.Unit
DHPC
TDDHPC
SPBparaSide Pin BalanceParabola
SPBtrackSide Pin balance Parabola
ParAdjParallelogram Adjustment Capability
PartrackParallelogram versus V-pos Control
DC Ouput Voltage (see Figure 3)V33= 4V,V35=V32,V41=4V4V
DC
DC Output Voltage Thermal DriftSee Note100ppm/°C
DC
= 2V,V29grounded,
V
28
= 6V,V33= 4V,
Amplitude (see Figure3)
Amplitude versus V-amp Control
(tracking between V-ampand SPB )
A/B ratio (see Figure.3)
B/A ratio
(tracking between V-posand DHPC)
A/B ratio
B/A ratio
V
31
V
35=V32,V41
V
42
V
42
= 2V,V29grounded,
V
28
= 4V,V35=V32,
V
33
= 4V,V42=6V
V
41
V
31
V
31
V
31
= 2V,V29grounded,
V
28
= 6V,V33= 4V,
V
31
V
35=V32,V42
V
41
V
41
= 2V,V29grounded,
V
28
= 6V,V41= 4V, V42=6V
V
31
= 2V,V35=V32,
V
33
= 6V,V35=V
V
33
=4V
=6V
=2V
=2V
=4V
=6V
=6V
=6V
=2V
32
TBD +1.45
- 1.45 TBD
0.36
0.82
1.45
TBD
TBD
0.12
0.12
0.53
0.53
V
V
V
V
V
9105-10.TBL
8/32
TDA9105
VERTICALSECTION (continued)
VerticalDynamic Focus Function
SymbolParameterTest ConditionsMin.Typ.Max.Unit
VDF
TDVDF
VDFAMPParabola Amplitude versus V-amp
VDFKEYParabola Assymetry versus V-pos
Note : These parameters are not tested on each unit. They are measured during our internal qualification procedure which includes
characterization on batches commingfrom corners of our processes andalso temperature characterization.
DC Output Voltage (see Figure 4)V33= 4V,V35=V
DC
DC Output Voltage Thermal DriftSee Note100ppm/C
DC
= 2V,V29grounded,
V
28
= 4V,V35=V32,
(tracking between V-ampand VDF)
(see Figure 4)
Control (tracking between V-pos
and VDF)
A/B ratio
B/A ratio
V
33
=2V
V
31
=4V
V
31
=6V
V
31
= 2V,V29grounded,
V
28
= 6V,
V
31
V
= 2V, V35=V32,
33
= 6V, V35=V
V
33
32
-0.84
-1.78
-3.14
0.42
32
0.48
6V
-0.72
-1.57
-2.85
0.52
0.58
-0.6
-1.36
-2.56
0.62
0.68
V
V
V
9105-11.TBL
9/32
TDA9105
Figure 1 : Testing Circuit
10kΩ
CC
V
23
19
10kΩ
1
38
10kΩ
37
41
39
Ω
10k
100nF
40
42
10kΩ
V
2.2µF
CC12V
CC
V
MOIRE
18
V-Sync
H-Sync
20
Ω
1k
CC
V
21
H
OUTPUT
BUFFER
2
X
35
SAFETY
416
CC
V
2
Ω
10k
22nF
47nF
53
47nF
PULSE
SHAPER
PHASE
SHIFTER
COMP
PHASE
PROCESSOR
VS
BLK
GEN
H-FLY
3622
V-SYNC
10/32
6.49kΩ 0.1%
VIDEOUNLOCK
10 1189
680pF 1%
µ
4.7
F
Ω
1.8k
10nF
1512
1µF
VCO
COMP
PHASE
FREQUENCY
LOCK
IDENT
UNLOCK
V-MID
V-REF
RAMP
VERT OSC
GENERATOR
S
CORR
470nF
1%
272531303332
1%
150nF
28
V-REF
POL
PULSE
SHAPER
7
6
F
µ
17
DETECT
PLL1
INHIB
14
13
262924
220nF
2.2
F
µ
2.2
PULSE
SHAPER
34
POL
DETECT
TDA9105
9105-03.EPS
TDA9105
Figure2 : E/WOutput
EW
A
EW
DC
PARA
Figure 4 : VerticalDynamic Focus Function
A
VDF
B
DC
Figure3 :DynamicHorizontal Phase Control
Output
V
=6V
42
V41=6V
B
A
SPB
9105-04.EPS
AMP
PARA
=2V
V
42
BVDF
DHPC
V33=2V
DC
9105-05.EPS
9105-06.EPS
11/32
TDA9105
TYPICAL VERTICALOUTPUTWAVEFORMS
Function
Control
Pin
Output
Pin
Control
Voltage
SpecificationPicture Image
Vertical Size3130
Vertical
Position
DC
3332
Control
Vertical
DC
In/Out
35
37
40
Vertical
S
2530
Linearity
2V
6V
2V
4V
6V
3.2V
3.5V
3.8V
2V
4V
This terminal is a Pin
1
controlling the centerposition
of geometric correction
signals. When connected to
Pin 32, ”Autotracking” occurs.
2V
∆V
12/32
Vertical
C
Linearity
2930
6V
2V
6V
∆V
∆V
V
V
V
∆V
∆
∆V
PP
V
PP
PP
=4%
=5%
=5%
9105-13.TBL/ 9105-07.EPS TO 9105-13.EPS
V
PP
V
PP
V
PP
TYPICAL GEOMETRYOUTPUT WAVEFORMS
Function
Control
Pin
Output
Pin
Control
Voltage
=4V
V
39
2V
TDA9105
SpecificationPicture Image
4.95V
2.95V
Trapezoid
Control
Pin Cushion
Control
Parrallelogram
Control
Side Pin
Balance
Control
3837
3937
41
40
4240
2.5V
6V
=4V
V
38
2V
2.95V
2.5V
2.5V
4.95V
0V
2.9V
6V
=4V
V
42
2V
6V
V
=4V
41
2V
4V
3V4V
3V4V
1.45V
1.45V
6V
Vertical
Dynamic
1
Focus
Note : The specification of Output voltage is indicated on 4VPPvertical sawtooth output condition.The output voltage depends on vertical
sawtooth output voltage.
6V
3V
13/32
9105-14.TBL/ 9105-14.EPS TO 9105-22.EPS
TDA9105
OPERATINGDESCRIPTION
GENERALCONSIDERATIONS
Power Supply
The typicalvalue of the powersupply voltage V
is 12V.Perfectoperationis obtainedif VCCismaintained in the limits : 10.8V → 13.2V.
In order to avoid erratic operation of the circuit
during thetransientphase of V
switchingoff,the valueof V
the circuitis internallypoweredby severalinternal
voltage references (The unique typical value of
which is 8V). Two of these voltage referencesare
externallyaccessible, one for the verticalpart and
one for the horizontal part. These voltage references can be used for the DC control voltages
applied onthe concernedpinsby thewayof potentiometers or digital to analog converters(DAC’s).
Furthermoreit isnecessaryto filterthea.m.voltage
references by the use of external capacitor connected to ground, in order to minimize the noise
and consequentlythe ”jitter” on vertical and horizontal output signals.
DC Control Adjustments
The circuithas10adjustmentcapabilities: 2forthe
horizontal part, 2 for the E/Wcorrection, 4 for the
vertical part, 2 for the Dynamic Horizontal phase
control.
The corresponding inputs of the circuit has to be
driven with a DC voltage typically comprised between 2 and 6V for a value of the internal voltage
referenceof 8V.
CC
In order to have a good tracking with the voltage
reference value, it’s better to maintainthe control
voltagesbetween V
/4 and 3/4⋅ V
REF
REF
.
The input current of the DC control inputs is typicallyvery low (about a few µA).Dependingon the
internalstructure of the inputs, itcan be positiveor
negative(sink or source).
HORIZONTAL PART
Input section
The horizontal input is designed to be sensitiveto
TTLsignalstypically comprisedbetween 0and 5V.
Thetypicalthresholdof this inputis1.6V.Thisinput
stageuses an NPN differentialstage and the input
currentis very low.
Figure6 : InputStructure
H-SYNC1.6V
Concerningthe duty cycle of the input signal, the
followingsignals may be appliedto the circuit.
Using internal integration,both signalsare recognizedon conditionthatZ/T≤ 25%.Synchronisation
occurs on the leading edge of the internal sync
signal. The minimum value of Z is 0.7µs.
Figure7
9105-24.EPS
Figure 5 :Exampleof PracticalDC Control
VoltageGeneration
V
REF
DCControl
PWM
DAC
Output
14/32
Voltage
PLL1
ThePLL1 is composedof aphase comparator, an
external filter and a VoltageControlled Oscillator
(VCO).
Thephasecomparatorisa”phasefrequency”type,
designedin CMOStechnology.This kind of phase
detector avoids locking on false frequencies. It is
followedby a ”charge pump”, composed of 2 current sourcessink and source(I =1mAtyp.)
9105-23.EPS
9105-25.EPS
OPERATINGDESCRIPTION (continued)
Figure 8 : Principle Diagram
13
LOCKDET
COMP1
E2
H-LOCKOUT
2
H-LOCKCAP
H-SYNC
17
INPUT
INTERFACE
The dynamic behaviour 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 9).
PLL1is inhibited byapplying a high level on Pin 14
(PLLinhib )whi chisa TTLcompatibl einput.Theinhibi tion results fr om the openingof a switc hlocated betweenthechargepumpandthefilter(see Figure8).
The VCOuses an externalRC network. It delivers
a linear sawtooth obtained by charge and discharge of the capacitor,bya currentproportionnal
to the current in the resistor. typical thresholds of
sawtoothare 1.6Vand 6.4V(see Figure10).
The control voltage of the VCO is typically comprised between 1.6V and 6V (see Figure 10). The
theoreticalfrequencyrangeofthis VCOisintheratio
1 → 3.75, but due to spread and thermal drift of
externalcomponentsand thecircuititself,the effec-
Figure 10 : Details of VCO
High
Low
CHARGE
PUMP
PLL1INHIB
INHIBITION
H-POS
PHASE
ADJUST
14
PLL
15
PLL1F R0 C0
1211 10
VCO
OSC
3.2V
tivefrequencyrange has tobe smaller (e.g.30kHz
→ 85kHz).In theabsenceofsynchronisationsignal
thecontrolvoltageisequalto1.6Vtyp.andtheVCO
oscillates on its lowestfrequency(free frequency).
Thesynchrofrequencyhastobealwayshigherthan
thefreefrequencyanda marginhas tobe taken.As
an example for a synchro range from 30kHz to
85kHz,the suggestedfree frequencyis 27kHz.
Figure9
PLL1F
12
TDA9105
9105-26.EPS
9105-27.EPS
Loop
12
Filter
(1.6V < V < 6V)
12
11
R0
I
0
2
I
0
4I
0
2
C0
10
6.4V
1.6V
6.4V
1.6V
0 0.75T T
RS
FLIPFLOP
9105-28.EPS
15/32
TDA9105
OPERATINGDESCRIPTION (continued)
The PLL1 ensures the coincidence between the
leading edge of the synchro signal and a phase
reference obtained by comparison between the
sawtooth of the VCO and an internal DC voltage
adjustablebetween 2.4V and 4V (byPin 15). So a
±45°phase adjustmentis possible(seeFigure 11).
Figure11 : PLL1 Timing Diagram
H Osc
Sawtooth
Phase REF1
H Synchro
Phase REF1 isobtainedby comparisonbetween thesawtoothand
a DCvoltage adjustable between 2.4V and 4V. The PLL1 ensures
the exact coincidence between the signals phase REF and
HSYNS.A ± T/8phase adjustment is possible.
0.75T
The twoVCO threshold canbe filteredby connecting capacitoron Pins8-9.
The TDA9103 also includes a LOCK/UNLOCK
identification block which senses in real-time
0.25T
6.4V
2.4V<Vb<4V
Vb
1.6V
whetherthePLLis lockedon the incominghorizontal sync signal or not. The resulting informationis
availableon HLOCKOUToutput (Pin 2). The block
diagram of the LOCK/UNLOCK function is describedin Figure 12.
TheNOR1 gateis receivingthe phasecomparator
output pulses (which alsodrive the chargepump).
Whenthe PLL is locked,on point A there is a very
small negative pulse (100ns) at each horizontal
cycle, so after R-C filter, there is a high level on
Pin13 whichforce HLOCKOUTto high level(providedthat HLOCKOUTis pulled up to V
CC
).
When the PLL is unlocked, the 100ns negative
pulseonA becomesmuchlargerandconsequently
the average level on Pin13 willdecrease.When it
reaches 6.5V, point B goes to low level forcing
HLOCKOUToutput to ”0”.
Thestatusof Pin13 isapproximatelythe following :
- Near 0Vwhen there is no H-SYNC,
- Between0 and4V withH-SYNCfrequencydifferent from VCO,
- Between 4 and8Vwhen H-SYNC frequency
9105-29.EPS
= VCOfrequency butnot in phase,
- Near to8Vwhen PLL is locked.
It is important to notice thatPin 13is notanoutput
pinand mustonly beused forfilteringpurpose(see
Figure12).
Figure 12 : LOCK/UNLOCKBlock Diagram
From
Phase
Comparator
NOR1
A
20kΩ
220nF
H-Lock CAP
13
6.5V
2
B
HLOCKOUT
9105-30.EPS
16/32
TDA9105
OPERATINGDESCRIPTION (continued)
PLL2The PLL2 ensures a constant position of the
Figure 13 : PLL2 TimingDiagram
H Osc
Sawtooth
0.75T
0.25T
6.4V
4V
1.6V
shaped flyback signalin comparison with the sawtoothof theVCO (seeFigure 13).
The phase comparator of PLL2 is followed by a
chargepump witha ±0.5mA(typ.) outputcurrent.
TheflybackinputiscomposedofanNPNtransistor.
This input has tobe currentdriven.
Themaximumrecommanded inputcurrentis 2mA
(seeFigures 14 and 15).
Flyback
Internally
Shaped
Flyback
H Drive
Ts
Duty Cycle
The duty cycle of H-driveis adjustable between 30% and 50%.
Figure 15 : Dual PLL Block Diagram
Horizontal
Input
17
C Lockdet
INPUT
INTERFACE
Adjust
Rapcyc
43
RAP
CYC
VBVA
HLOCKOUT
131412 11 10
2
LOCKDET
High
COMP1
LowE2
Cap
PHi2
CHARGE
PUMP
High
Low
Figure14 : Flyback Input Electrical Diagram
400Ω
5
HFLY
20kΩ
9105-31.EPS
CHARGE
PUMP
COMP2
PLL1INHIB
INHIBITION
Horizontal
PHASE
ADJUST
4V
EN
PLL
Adjust
15
R0 C0Filter
VCO
3.2V
GND 0V
OSC
FLYBACK
Q1
Flyback
5
9105-32.EPS
PWM
LOGI
PWM
BUFFER
21
20
SortCOLL
SortEM
17/32
9105-33.AI
TDA9105
OPERATINGDESCRIPTION (continued)
Output Section
The H-drive signal is transmitted to the output
through a shaping block ensuring a duty cycle
adjustable from 30% to 50%. In order to ensure a
reliable operation of the scanningpower part, the
output is inhibitedin the followingcircumstances:
-V
too low,
CC
- Xray protectionactivated,
- During thehorizontal flyback,
- Outputvoluntarily inhibited throughPin 4.
The outputstage iscomposedofa DarlingtonNPN
bipolartransistor.Boththecollectorand theemitter
are accessible(see Figure 16).
The maximum output current is 20mA, and the
correspondingvoltagedropofthe outputdarlington
is 1.1Vtypically.
It is evident that the power scanning transistor
cannot be directly driven by the integratedcircuit.
An interfacehasto bedesignedbetweenthe circuit
and the power transistorwhich can be ofbipolaror
MOS type.
X-RAY PROTECTION : the activation of the X-ray
protectionis obtained by applicationof ahigh level
on the X-ray input (>8V). Consequences of X-ray
protectionare :
- Inhibition of H drive output,
- Activationof compositeblanking output.
The reset of this protection is obtained by V
CC
switchoff (see Figure 17).
Figure16 : Output stagesimplifieddiagram,
showingthe two possibilitiesof
connection
V
21
CC
20
V
CC
21
H-DRIVE
H-DRIVE
Outputs inhibition
The applicationof a voltagelower than1V (typ.) on
Pin 4(duty cycle adjust) inhibitsthe horizontaland
vertical outputs. Thisis not memorised.
Figure 17 : Safety FunctionsBlock Diagram
Checking
V
CC
V
CC
REF
XRAY Protection
1V
0.7V
S
R
Inhibition
LOGIC
BLOCK
Q
XRAY
V
CC off
H-Duty cycle
Flyback
V-fly
Vsync
V sawtooth
retracetime
H-fly
20
9105-34.EPS
H OUTPUT
INHIBITION
V OUTPUT
INHIBITION
COMPOSITE
BLANKING
to 2ND PLL
9105-35.EPS
18/32
OPERATINGDESCRIPTION (continued)
Moire Function
Figure 18 : Moire Function Block Diagram
TDA9105
H-SYNC
V-SYNC
Figure 19 : Moire Output Waveform
EVEN FRAME
H
V
MOIRE
ODD FRAME
H
Monosta ble
Ck
D
Ck
D
Rst
Q
Q
Q
Q
23
9105-36.EPS
V
MOIRE
Geometric Corrections
The principle isrepresentedin Figure20.
Starting from the verticalramp, aparabolashaped
is generatedfor E/Wcorrection,dynamichorizontal
phase control correction, and verticaldynamicFocus correction.
The core of the parabola generator is an analog
multiplier. The output currentof whichis equalto :
2
.
is a vertical DC
Where V
∆I=k(V
is the vertical ramp, typically com-
RAMP
RAMP-VDCIN)
prised between 2 and 5V, V
DCIN
input adjustablein the range 3.2V → 3.8V in order
to generate a dissymmetric parabola if required
(keystoneadjustment).
In order to keep good screengeometryforany end
user preferencesadjustment we implemented the
possibilityto have”geometry tracking”. To enable
the ”tracking” function, the V
nectedto V
It is possible to inhibitV
fixedDC voltageon theV
DCIN
.
POS
DCIN
DCOUT
trackingby applying a
must be con-
Pin.
This DC voltage in that case must be taken from
the verticalreference and adjustedto 3.5Vwith an
externalbridge resistor.
Due to large output stages voltage range (E/W,
BALANCE, FOCUS), the combination of tracking
function with maximum vertical amplitudemax. or
min.vertical positionand maximumgainonthe DC
controlinputsmay leads to theoutputstagessaturation. This must be avoided by limitingthe output
voltageby apropriateDC controlvoltages.
ForE/WpartandDynamicHorizontalphasecontrol
part, a sawtooth shaped differentialcurrent in the
followingformisgenerated:∆I’= k’(V
RAMP-VDCIN
Then ∆Iand∆I’are added together and converted
into voltage.
These two parabola are respectively available on
Pin 37 andPin40 bythe way of an emitter follower
which has to be biased by an external resistor
(10kΩ). They can be DC coupled with external
circuitry.
EWV
= 2.5V+ K1’(V
OUT
+K
RAMP-VDCIN
1(VRAMP-VDCIN
2
)
K1isadjustableby EW amp control (Pin 39)
’ is adjustableby KEYST control (Pin 38)
K
1
EW AMP
EW OUT
KEYSTONE
SIDEPIN AMP
SIDE PIN BAL. OUT
KEY BALANCE
Dyn. Hor.
PhaseControl
).
K2is adjustableby SPBamp control (Pin 42)
’is adjustableby KEYBALcontrol (Pin 41)
K
2
V
OUT
=4V+K2’(V
+K
2(VRAMP-VDCIN
RAMP-VDCIN
For vertical dynamic focus part, only a constant
amplitudeparabolais generated in the form :
The verticalpart generatesa fixed amplitude ramp
which can be affected by a S and C correction
shape.Then,the amplitude ofthisrampis adjusted
to drivean externalpower stage.
The internalreference voltageused forthe vertical
part isavailablebetween Pin 26 andPin24. Itcan
be usedasvoltagereferenceforany DCadjusment
C CORRECTION
30
31
VERT_OUT
39
EW_AMP
37
EW_OUT
40
SPB_OUT
1
V_FOCUS
Vlow
Sawth.
Disch.
VERT_AMP
to keep a high accuracy to each adjustment. Its
typicalvalue is :
V26=V
REF
= 8V.
The charge of the external capacitor on Pin 27
) generates a fixedamplitude ramp between
(V
CAP
the internal voltages, V
(VH=5/8 ⋅ V
REF
).
L(VL
=V
REF
/4) and V
9105-39.EPS
H
21/32
TDA9105
OPERATINGDESCRIPTION (continued)
VERTICALPART (continued)
Function
When the synchronisationpulse is not present, an
internal current source sets the free running frequency.For an external capacitor,C
the typicalfree running frequencyis 100Hz.
Typical free running frequency can be calculated
by :
f0(Hz)=1.5 ⋅ 10−5⋅
1
C
OSC
A negative or positive TTL level pulse applied on
Pin 34 (VSYNC) can synchronise the ramp in the
frequencyrange [fmin,fmax].This frequencyrange
depends on the external capacitor connected on
Pin 27. A capacitor in the range [150nF, 220nF] is
recommanded for application in the following
range: 50Hz to 120Hz.
Typical maximumandminimumfrequency,at 25°C
and without any correction (S correction or C correction), can becalculated by :
=2.5 ⋅ f0and f
f
max
min
=0.33 ⋅ f
0
If S or C corrections are applied,these values are
slighty affected.
If an externalsynchronisationpulse is applied, the
internal oscillator is automaticaly caught but the
amplitude is no more constant. An internalcorrection is activated to adjust it in less than half a
second: the highest voltage of theramp onPin27
is sampledon thesamplingcapacitorconnectedon
Pin 25 (VAGCCAP) at each clock pulse and a
transconductance amplifier generates the charge
current of the capacitor. The ramp amplitude becomes again constant.
It is recommandedto usea AGCcapacitorwithlow
leakagecurrent.A valuelower than 100nA ismandatory.
Pin 36, Vfly is the vertical flyback input used to
generate the composite blanking signal. If Vfly is
not used, (V
- 0.5), at minimum, must be con-
REF
nected to thisinput.
DC Control Adjustments
Then, S and C correction shapes can be addedto
this ramp. This frequency independent S and C
corrections are generated internally; their ampli-
(nF)
OSC
= 150nF,
tude are DC adjustable on Pin 28 (V
SAMP
) and
Pin 29 (COR-C).
S correctionis non effectivefor V
/4 and maximumfor V
V
REF
SAMP
SAMP
= 3/4 ⋅ V
lower than
.
REF
C correctionis non effectivefor COR-C grounded
and maximum for :
COR-C = V
/4 or COR-C = 3/4 ⋅ V
REF
REF
.
Endly,the amplitudeof thisSandC correctedramp
can be adjustedby the voltage applied on Pin 31
). The adjustedramp is available on Pin 30
(V
AMP
) to drive an external power stage. The gain
(V
OUT
of thisstageistypically±30% whenvoltage applied
on Pin31 is in the rangeV
/4 to3/4 ⋅ V
REF
REF
.The
DC value of this ramp is kept constant in the
frequency range , for any correction applied onit.
Its typicalvalue is : V
DCOUT=VMID
ADC voltage is availableon Pin 32 (V
= 7/16 ⋅ V
DCOUT
driven bythe voltageapplied on Pin33 (V
For a voltage control range between V
3/4 ⋅ V
V
DCOUT
So,theV
of V
, thevoltageavailableon Pin 32is :
REF
= 7/16 ⋅ V
DCOUT
. It increases the accuracywhen tempera-
OUT
±300mV.
REF
voltageis correlated withDC value
REF
REF
). Itis
POS
/4 and
.
)
ture varies.
Basic Equations
In firstapproximation,theamplitudeof therampon
Pin 30 (V
V
OUT-VMID
with V
V
V
On Pin32 (V
lated by : V
is the voltageapplied on Pin33.
V
POS
)is:
OUT
=(V
CAP-VMID
= 7/16 ⋅ V
MID
isthe middlevalueof therampon Pin27
MID
CAP=V27
, ramp withfixed amplitude.
DCOUT
DCOUT=VMID
) [1 + 0.16 ⋅ (V
; typically 3.5V
REF
AMP-VREF
), thevoltage (in volts)is calcu-
+0.16 ⋅ (V
POS-VREF
/2)]
/2).
The current available on Pin27
(when V
I
OSC
C
SAMP=VREF
=3/8 ⋅ V
: capacitorconnectedon Pin 27
OSC
REF
⋅ C
/4) is :
OSC
⋅ f
f synchronisationfrequency
The recommanded capacitor value on Pin 25
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility
for the consequences of use of such information nor for anyinfringement of patents or otherrights ofthird parties which may result
from its use. Nolicence is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics.
Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all
information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components inlife
support devices or systems without express written approval of SGS-THOMSON Microelectronics.
PMSDIP42.EPS
SDIP42.TBL
32/32
1996 SGS-THOMSON Microelectronics - All RightsReserved
Purchase of I
2
I
C Patent. Rights to use these components in a I2C system, is granted provided that the system conformsto
2
C Components ofSGS-THOMSON Microelectronics,conveys alicense under the Philips
2
the I
C Standard Specifications as defined by Philips.
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