MC141627 Просмотр технического описания (PDF) - Motorola => Freescale
Номер в каталоге
Компоненты Описание
производитель
MC141627 Datasheet PDF : 16 Pages
| |||
OUT
OUT
WHITE LEVEL
(C4 – C7)
WHITE
(0 – 15 STEP)
IN
IN
BLACK
OUT
IN
NOISE LEVEL
(D4 – D7)
(0 – 15 STEP)
OUT
IN
BLACK LEVEL
(C0 – C3)
(0 – 15 STEP)
C7
C6
C5
C4
C3
C2
C1
C0
D7
D6
D5
D4
Level
L
L
L
L
0
L
L
L
H
1
L
L
H
L
2
L
L
H
H
3
L
H
L
L
4
L
H
L
H
5
L
H
H
L
6
L
H
H
H
7
H
L
L
L
8
H
L
L
H
9
H
L
H
L
10
H
L
H
H
11
H
H
L
L
12
H
H
L
H
13
H
H
H
L
14
H
H
H
H
15
Figure 2. Coring Characteristics
OPERATING MODES
The Advanced Comb Filter–II can be operated in any of
three modes. These modes are fixed by a digital code input
into MODE0 and MODE1. The descriptions of the four types
of operating modes are:
Normal (FSC) Mode
This mode is for the normal Y/C separation. The video sig-
nal input to the A/D converter is separated into its Y and C
components and output as analog information from the D/A
converter outputs. The clamp circuit operates as sync tip
clamp by connecting CLout with Vin, and clamps the input
video signal to the fixed value $04. The coring characteristics
of the vertical enhancer circuit can be set using the digital
port. This mode operates the internal 4xFSC CLK which is
generated by the built–in 4xFSC PLL.
Normal (4xFSC) Mode
This mode is for the normal Y/C separation. The video sig-
nal input to the A/D converter is separated into its Y and C
components and output as analog information from the D/A
converter outputs. The clamp circuit operates as sync tip
clamp by connecting CLout with Vin, and clamps the input vid-
eo signal to the fixed value $04. The coring characteristics of
the vertical enhancer circuit can be set up on the digital port.
This mode operates the external 4xFSC CLK which is input
on the FSC pin.
Digital Input Comb Filtering Mode
In this mode, the MC141627 uses only the filter and D/A
portion. This mode can input 8–bit digital outputs from an ex-
ternal circuit. The 8–bit external digital data can be input into
D0 – D7, and the input data is filtered by the Advanced Comb
Filter–II algorithm, and one output as an analog signal from
Yout and Cout.
Table 3. Operating Mode
Mode
Normal (FSC) Mode
Normal (4xFSC) Mode
Digital Input Comb Filtering Mode
MODE1
L
L
H
MODE0
L
H
L
MC141627
8
MOTOROLA
Share Link: 