VSP9402A Ver la hoja de datos (PDF) - Micronas
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VSP9402A Datasheet PDF : 126 Pages
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VSP 94x2A
DATA SHEET
Table 2–3: Allowed combinations for color-standard
search (50 Hz)
Standard
(50 Hz)
None
PAL N
PAL B
SECAM
Automatic
PAL BG / SECAM
CSTAND
D2
D1
D0
0
0
0
0
0
1
0
1
0
1
0
0
1
1
0
Table 2–4: Allowed combinations for color-standard
search (60 Hz)
Standard
(60 Hz)
PAL M
NTSC M
NTSC44
Automatic
PAL M / NTSC M
Automatic
NTSC M /
NTSC44/PAL60
CSTAND
D6 D5 D4 D3
0
0
1
0
0
1
0
0
1
0
0
0
0
1
1
0
1
1
0
0(!)
In addition, a standard can be forced as well.
AMSTD50 selects whether PAL B or SECAM is tried
first in the automatic routine. AMSTD60 selects
whether NTSC44/PAL60 or NTSC M is tried first. Both
bits can also be set for automatic detection, then the
last detected chroma standard will be used. For
SECAM detection, a choice between different recogni-
tion levels is possible (SCMIDL, SCMREL) and the
evaluated burst position is shiftable (BGPOS).
Color standard (STDET), line standard (LNSTDRD)
and color killer status (CKSTAT) can be read out.
An Automatic Chroma Control (ACC) produces a sta-
ble output for input chroma variations from (approxi-
mately) -30 dB to +6 dB compared to nominal burst
value. The ACC reference value is programmable for NTSC
and PAL independently (NTSCREF, PALREF) to ensure
correct color saturation. With ACCFIX, the ACC is dis-
abled and a constant value (dependent on NTSCREF
and PALREF) is used instead.
ACCFRZ holds the current ACC value. The maximum
amplification of the ACC can be limited by ACCLIM.
This results a smooth attenuation of color intensity for
weak color carrier (see Fig. 2–5).
U,V
+0dB
CON
color off
+6dB
-4dB
CKILL
ACCLIM
PAL, NTSC operation
attenuation of
color-carrier
U,V
+0dB
CONS
color off
+6dB
-4dB
CKILLS attenuation of
color-carrier
SECAM operation
Fig. 2–5: Color Killer Adjustment
10
Aug. 16, 2004; 6251-552-1DS
Micronas
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