VDP3108 Просмотр технического описания (PDF) - Micronas
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VDP3108 Datasheet PDF : 61 Pages
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VDP 3108
ADVANCE INFORMATION
The dynamic range can be adjusted to 0 ... +14 dB for
small high frequency signals. Adjustment is separate for
signal overshoot and for signal undershoot. For large
signals the dynamic range is limited by a nonlinear func-
tion that does not create any visible alias components.
The center frequency of the peaking filter is switchable
from 2.5 MHz to 3.2 MHz. For S-VHS and for notch filter
color decoding, the total system frequency responses
for PAL and NTSC are shown in figure 2–17.
Transients, produced by the dynamic peaking when
switching video source signals, can be suppressed via
the priority bus.
dB
20
15
CF= 3.2 MHz
10
5
0
S-VHS
–5
–10
–15
–20
MHz
0
2
4
6
8
10
dB
20
15
10
5
0
–5
–10
–15
–20
0
2
4
6
8
MHz
10
Fig. 2–16: Dynamic peaking frequency re-
sponse
dB
20
15
CF= 2.5 MHz
10
5
0
–5
–10
–15
–20
MHz
0
2
4
6
8
10
dB
20
15
CF= 3.2 MHz
dB
20
15
CF= 2.5 MHz
10
10
5
5
0
PAL/SECAM 0
–5
–5
–10
–10
–15
–20
0
2
4
6
8
MHz
10
–15
–20
MHz
0
2
4
6
8
10
dB
20
15
CF= 3.2 MHz
dB
20
15
10
10
5
5
0
NTSC
0
–5
–5
–10
–10
–15
–20
0
2
4
6
8
MHz
10
–15
–20
0
2
4
Fig. 2–17: Total frequency response for peaking filter and S-VHS, PAL, NTSC
CF= 2.5 MHz
6
8
MHz
10
14
MICRONAS INTERMETALL
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