U4935B Datasheet, PDF (12/16 Pages) TEMIC Semiconductors – SECAM Decoder

U4935B
Sandcastle Pulse
The required blanking burst and f_H/2 pulses are derived from a three-level sandcastle pulse.
(see figures 16 and 17)
Pin 15
SCP in
3.85 V
2.0 V
1.25 V
HBLK
F/F
(fH/2 pulse)
VBLK
125 ms
SECAM sw
SECAM sw
Pin 15 SCP detection level :
BGP : 3.85 V
HBLK : 2.0 V
VBLK : 1.25 V
Figure 21. Timing chart of the internal pulses
96 11716
12 (16)
Pin 15
SCP in
0.2 ms
SECAM
BGP
4.5 ms
95 11717
Figure 22. Timing chart of the internal SECAM burst gating pulse
TELEFUNKEN Semiconductors
Preliminary Information
Rev. A1, 28-Jan-97