TDA9112A View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TDA9112A' PDF : 60 Pages View PDF
9.4.5 Vertical moiré
To blur potential moiré patterns due to interaction
of deflection lines with CRT mask grid, the picture
position is to be slightly alternated at frame fre-
quency. For this purpose, a square waveform at
half-frame frequency is superimposed on the out-
put waveform. Its amplitude is adjustable through
VMOIRE I²C-bus control.
Figure 12. Vertical section block diagram
TDA9112A
9.4.6 Biasing of vertical booster
The biasing voltage for external DC-coupled verti-
cal power amplifier is to be derived from VRefO
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 VRefO value (and so
mean output value) between particular devices.
Charge current
Trans-conductance amplifier
VSyn 2
Synchro
Polarity
OSC
Cap.
VCap
22
Discharge
Controller
Q1
VVOTref
Sampling
20 VAGCCap
Sampling
R
Capacitance
Vmidref
Vmidref
sawtooth R
discharge
Vmidref
To geometry processing
Internal
V-ramp
VVOB
19
VOscF
VEHTIn 18
VSIZE (I²C)
VPOS (I²C)
VEHTG (I²C)
VMOIRE (I²C)
VOut 23
VVEHTnull
SCOR (I²C)
S-correction
VPOF (I²C)
VPOS (I²C)
VSAG (I²C)
CCOR (I²C)
C-correction
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