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STV2001 Datasheet(PDF) 30 Page - STMicroelectronics

Part No. STV2001
Description  I2C SINGLE FREQUENCY DEFLECTION PROCESSOR AND 120 MHz RGB PREAMPLIFIER
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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STV2001 Datasheet(HTML) 30 Page - STMicroelectronics

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Due to the large output stage voltage range (E/W
Pin Cushion, Keystone), the combination of the
tracking function, maximum vertical amplitude,
maximum or minimum vertical position and maxi-
mum gain on the DAC control may lead to output
stage saturation. This must be avoided by limiting
the output voltage with appropriate I2C register
values. For the E/W part and the dynamic horizon-
tal phase control part, a sawtooth-shaped differen-
tial current in the following form is generated:
∆I’ = k’ . (V
OUT - VDCMID).
Then
∆I and ∆I’ are added and converted into volt-
age for the E/W part.
Each of the two E/W components or the two dy-
namic horizontal phase control components may
be inhibited by their own I2C select bit.
EW output voltage is available at EWout pin direct-
ly. External buffer circuit is required to drive Dar-
lington pair transistor, which is sinking the DIODE
MODULATOR current in order to achieve EW cor-
rection. Additionally, an I2C controlled DC shift is
used for H-width.
The dynamic horizontal phase control drives the
H-position internally, moving the HFLY position on
the horizontal sawtooth in the range of
± 2.8 %T
H
both for side pin balance and parallelogram.


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