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TDA9109A Datasheet(PDF) 33 Page - STMicroelectronics

Part # TDA9109A
Description  LOW-COST I2C CONTROLLED DEFLECTION PROCESSOR FOR MULTISYNC MONITOR
PDF  47 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA9109A Datasheet(HTML) 33 Page - STMicroelectronics

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2.6 Horizontal and Vertical Dynamic Focus
The TDA9109A delivers a horizontal parabola
which is added on a vertical parabola waveform on
Pin 10. This horizontal parabola comes from a
sawtooth in phase advance with flyback pulse mid-
dle. The time advance versus horizontal flyback
middle is kept constant versus frequency (about
1
µs).
Symmetry and amplitude are I2C adjustable (see
Figure 15). The vertical dynamic focus is tracked
with VPOS and VAMP. Its amplitude can be ad-
justed. It is also affected by S and C corrections.
This positive signal once amplified is to be sent to
the CRT focusing grids.
Figure 15. Phase of HFocus Parabola



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