UNIVERSAL TELETEXT DECODERS
‘EUROTEXT’
‘EUROTEXT’ CF70200
CF70200
DRAFT 11
15-Feb-96 1Q96
15
9.0 PIN DESCRIPTION
Data Input Pins
CSB
Composite sync input. This pin should be connected to the SYNC output of
the data slicer.
TCLK
Teletext clock signal. This pin should be connected to the TCLK pin of the
data slicer.
TDATA
Teletext data. This pin should be connected to the TDATA pin of the data
slicer.
WIND
This output is high during the VBI lines of the video signal and is used as a
gating signal for the capture of teletext. This pin should be connected to the
WIND pin of the data slicer.
VIDEO
Video input to sync switch. The signal to this pin should be AC coupled.
I
2
C Interface
SDA
I
2
C data line. Open drain I/O pin.
SCL
I
2
C clock line. Open drain I/O pin.
Display Pins
BLANK
Blanking. This signal is high when teletext information is displayed on the
RGB lines.
R, G, B
Display data (75 ohm drive capacity).
RGBSET
Adjustment for the RGB output levels. The level of the RGB signals can be
adjusted from 0.5V to 1.5V by setting the current through this pin using an
external resistor.
REF
Internal reference pin. A 10nF capacitor should be connected between this
pin and ground.
SYNC
This pin is the output of an internal sync switch. It will either output the
composite sync. pulse from the internal sync generator in text mode or it will
be connected to the video input pin when any picture information is being
displayed.