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TDA9109N Datasheet(PDF) 23 Page - STMicroelectronics

Part # TDA9109N
Description  LOW-COST DEFLECTION PROCESSOR FOR MULTISYNC MONITORS
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA9109N Datasheet(HTML) 23 Page - STMicroelectronics

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OPERATING DESCRIPTION (continued)
For the E/W part and the dynamic horizontal phase
control part, a sawtooth-shapeddifferential current
in the following form is generated :
DI’ = k’
⋅ (VOUT -VDCMID)
Then
∆I and ∆I’ are added and converted into
voltage for the E/W part.
Each of the two E/W components or the two dy-
namic horizontal phase control ones may be inhib-
ited by their own I
2C 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
Ω to ground).
Since stable in temperature, the device can be DC
coupled with an external circuitry.
The vertical dynamic focus is combined with the
horizontal focus on Pin 10.
The dynamic horizontal phase control drives inter-
nally the H-position, moving the HFLY position on
the horizontal sawtooth in the range of
± 1.4% TH
both for side pin balance and parallelogram.
EW Output
EW Amp
Keystone
Sidepin Amp
Parallelogram
Dynamic Focus
Sidepin Balance
Output Current
To Horizontal
Phase
V
DCMID (3.5V)
2
Vertical Ramp VOUT
V.Focus
Amp
HORIZONTAL
DYNAMIC FOCUS
Parabola
Generator
V
DCMID
(3.5V)
V
DCMID
(3.5V)
23
24
10
Figure 17 : Geometric Corrections Principle
III.6 - E/W
EWOUT = 2.5V + K1 (VOUT -VDCMID) + K2 (VOUT -VDCMID)
2
K1 is adjustable by the keystone I
2C register
K2 is adjustable by the E/W amplitude I
2C register
III.7 - Dynamic Horizontal Phase Control
IOUT =K3 (VOUT -VDCMID) + K4 (VOUT -VDCMID)
2
K3 is adjustable by the parallelogram I
2C register
K4 is adjustable by the side pin balance I
2C register
TDA9109/N
23/32


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