TEA2029 STMICROELECTRONICS [STMicroelectronics], TEA2029 Datasheet - Page 35

• Manufacturer Part Number: TEA2029
• Description: APPLICATION NOTE
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

V.8 - Miscellaneous functions
V.8.1 - Super sandcastle signal generator
This signal used in video stage, is available on
Pin 11.
It has 3 levels at specified time intervals :
- 2.5V level
- 4.5V level
Figure 70
Figure 71
Used for vertical blanking at each frame flyback.
Its duration is 21 lines and is generated by the
frame logic.
This level will be maintained if vertical scanning
failure is detected on Pin 2.
Used for horizontal blanking, its duration is deter-
mined by comparing the line flyback signal on
0
60Hz
50Hz
1
VIDEO SIGNAL
(Pin 27)
SUPER
SAND CASTLE
(Pin 11)
R
R
V
+
CC
Mute
2.5V
24
V
Line Blanking (12 s)
0.3 s
+
CC
Frame Blanking (21 lines)
4.5V
4.7 s
V
24
- 10V level
V.8.2 - Video and 50/60Hz standard recognition
output
A 3-level signal is available at Pin 24 for video
identification(Mute) and for 50 and 60Hz standards
recognition.
TEA2028 - TEA2029 APPLICATION NOTE
Burst
V
Pin 12 to an internal voltage of 0.25V.
This signal is used by color decoding stage. Its
duration of 4 s is determined by line logic cir-
cuitry. With respect to the video signal on Pin 27,
this level is positioned such that it is used to
sample the burst frequency transmitted just after
the sync pulse.
10V
4 s
24
0
Without
Video
V
CC
/2
Standard
60Hz
V
Identification
CC
Transmit
Standard
50Hz
35/46