SDA9488X Datasheet, PDF (30/87 Pages) Micronas – Cost-effective Picture-In-Picture ICs

SDA 9488X
SDA 9588X
Preliminary Data Sheet
System Description
For variations of parental horizontal frequency (e.g. VCR), a digital correction of the
position is useful to stabilize the picture (POSCOR). This circuit detects a varying
parental line frequency and moves the picture to the place, where it would have been
without this frequency deviation. The calculation is done once a field.
4.8.6
Select Signal
For controlling an external RGB or YUV switch a select signal is supplied. The delay of
this signal is programmable for adaptation to different external output signal processing
devices (SELDEL). SELDOWN sets this output to tristate (high-resistance).
PiP signal
OUTx
frame
picture
SEL
SELDEL
Figure 4-14 Select timing
4.9
DA-Conversion And RGB / YUV Switch
The SDA 9588X/SDA 9488X include three 7bit DA-converters. Brightness (BRTADJ),
Contrast (CON) and overall amplitude (PKLR, PKLG, PKLB) of the output signal are
adjustable. External RGB or YUV signals can be connected to the inputs IN1...3. By
forcing the FSW input to high-level these signals are switched to the outputs OUT1...3
while the internal signals are switched off. The FSW input signal is passed through to the
SEL output. The setting of RGBINS determines wether an RGB insertion is possible and
which source, the external picture or the PiP, gets priority.
Micronas
4-30