STV6886 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STV6886' PDF : 43 Pages View PDF
STV6886
Due to the large output stage voltage range (E/W
Pin Cushion, Keystone, E/W Corner), the combi-
nation of the tracking function, maximum vertical
amplitude, maximum or minimum vertical position
and maximum 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 horizontal
phase control part, a sawtooth-shaped differential
current in the following form is generated:
∆I’ = k’ . (VOUT - VDCMID)
Then ∆I and ∆I’ are added and converted into volt-
age for the E/W part.
Figure 17. Geometric Corrections Principle
Each of the three E/W components or the two dy-
namic horizontal phase control components may
be inhibited by their own I2C 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 (10kΩ to ground). Be-
ing stable in temperature, the device can be DC
coupled with external circuitry (mandatory to ob-
tain H Size control).
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 ± 2.8 %TH
both for side pin balance and parallelogram.
3.6 E/W
EWOUT =
K2 (VOUT -
EVWDCDMCID+)2K+1K(3VO(VUOTU-TV-DVCDMCIDM)ID+)4
K1 is adjustable by the keystone I2C register.
K2 is adjustable by the E/W amplitude I2C register.
K3 is adjustable by the E/W corner I2C register.
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