參數(shù)資料
型號(hào)： MC44011FN
廠商： MOTOROLA INC
元件分類： 消費(fèi)家電
英文描述： BUS CONTROLLED MULTISTANDARD VIDEO PROCESSOR
中文描述： SPECIALTY CONSUMER CIRCUIT, PQCC44
封裝： PLASTIC, LCC-44
文件頁數(shù)： 25/52頁
文件大小： 835K
代理商： MC44011FN
MC44011
25
MOTOROLA ANALOG IC DEVICE DATA
FUNCTIONAL DESCRIPTION
Introduction
The MC44011, a member of the MC44000 Chroma 4
family, is a composite video decoder which has been tailored
for applications involving multimedia, picture–in–picture, and
frame storage (although not limited to those applications).
The first stage of the MC44011 provides color difference
signals (R–Y, B–Y, and Y) from one of two (selectable)
composite video inputs, which are designed to receive PAL,
NTSC, and S–VHS (Y,C) signals. The second stage provides
either RGB or YUV outputs from the first stage’s signals, or
from a separate (internally selectable) set of RGB inputs,
permitting an overlay function to be performed. Adjustments
can be made to saturation; hue; brightness; contrast;
brightness balance; contrast balance; U and V bias;
subcarrier phase; and color difference gain ratio.
The above mentioned video decoding sections provide the
necessary luma/delay function, as well as all necessary
filters for sound traps, luma/chroma separation, luma
peaking, and subcarrier rejection. External tank circuits and
luma delay lines are not needed. For PAL applications, the
MC44140 chroma delay line provides the necessary
line–by–line corrections to the color difference signals
required by that system.
The MC44011 provides a pixel clock to set the sampling
rate of external A/D converters. This pixel clock, and other
horizontal frequency related output signals, are
phase–locked to the incoming sync. The VCO’s gain is
adjustable for optimum performance. The MC44011 also
provides vertical sync and field identification (Field 1, Field 2)
outputs.
Selection of the various inputs, outputs, and functions, as
well as the adjustments, is done by means of a two–wire I2C
interface. The basic procedure requires the microprocessor
system to read the internal flags of the MC44011, and then
set the internal registers appropriately. This I2C
interface
eliminates the need for manual controls (potentiometers) and
external switches. All of the external components for the
MC44011, except for the two crystals, are standard value
resistors and capacitors, and can be non–precision.
(The DACs mentioned n he ollowing description are 6–bits wide. The
settings mentioned for them are given in decimal values of 00 to 63.
These are not hex values.)
PAL/NTSC/S–VHS Decoder
A block diagram of this decoder section is shown in
Figure 35. This section’s function is to take the incoming
composite video (at Pins 1 or 3), separate it into luma and
chroma information, determine if the signal is PAL or NTSC
(for the flags), and then provide color difference and luma
signals at the outputs. If the input is S–VHS, the luma/chroma
separation is bypassed, but the other functions are still
in effect.
Sep
41
42
C
C
ACC
C
Sound
Trap
($77–6)
Chroma
Filter
Blanking
Color System
($7C–7,6; $7D–6)
Flag 24
(PAL)
Flag 23
(ACC Active)
Chroma Trap and
Luma Peaking
($7D–7; $7E–7,6)
($77–7)
4.4/4.8/5.2
5.5/6.0/6.5 MHz
($7B–7,6)
To Color
Diff Stage
Y1 Out
Y1 Clamp
System
Select
Ident
Filter
R–Y Out
B–Y Out
3.6/7.2/28.6/4.4/
8.8/35.4 MHz Notch
Switches shown with control bits = 0.
Crystal Select
($7A–7)
Phase Adjust ($79–5/0)
Xtal 2
Xtal 1
Chroma PLL Filter
ACC Filter
Comp
Video 2
Comp
Video 1
Select
($88–7)
PLL
Saturation ($87–5/0)
Hue ($88–5/0)
Color Balance ($78–5/0)
Oscillator
Ident
Circuit
295/244 ns
Luma
Delay
Adjustable
Luma Delay
($7F–7,6; $80–6)
32
33
34
43
36
38
44
2
3
1
PAL/NTSC
Decoder
Figure 35. PAL/NTSC/S–VHS Decoder Block Diagram
3.6/7.2/28.6/4.4/
8.8/35.4 MHz Notch
Sync
To
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