SDA9188-3X Infineon Technologies Corporation, SDA9188-3X Datasheet - Page 10

• Manufacturer Part Number: SDA9188-3X
• Description: Picture-in-picture Processor With On-chip PLL
• Manufacturer: Infineon Technologies Corporation

RGB, Y, U, V Outputs
A digital RGB matrix converts the Y, U, V data in R, G, B data.
The equation of the implemented RGB Matrix are:
R = Y + 0.75 V
G = Y – 0.375 V – 0.1875 U
B = Y + U
For a signal with 100 % white and 75 % color saturation the amplitudes of the analog input signals
have to be set according the following relation:
Y / U / V = 0.72 / 0.95 / 1
By means of an internal switch at the output of the RGB matrix it is possible to by-pass the matrix
with the digital data for Y, U and V and feed them directly into the D/A converters. During this
operation mode the chrominance data U and V will be inverted.
D/A Conversion
SDA 9188-3X includes three 6-bits D/A converters. Each D/A converter delivers a current through
an external resistor that is to be connected between OUT1-OUT3 and
determines the output voltages (see application circuit). The assignment of outputs OUT1-OUT3
to R, G, B and Y, U, V is shown in table 5. It is possible to change the output voltage via I
Register 4.
The tolerances of the output voltages can be reduced significantly if the resistor at
by means of a constant current source.
Table 5
Assignment of Output Signals to OUT1-OUT3
Output
OUT1
OUT2
OUT3
Borderframe
The width of the border frame can be adjusted in two steps, the intensity of the frame can be set in
16 steps via the I
Semiconductor Group
2
RGB
R
G
B
C bus.
YUV
– V
– U
Y
10
V
SSA
. The resistor value
SDA 9188-3X
V
REF
is replaced
2
C bus