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參數(shù)資料
| 型號： | MC44011FB |
| 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, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁數(shù)： | 28/52頁 |
| 文件大?。?/td> | 835K |
| 代理商： | MC44011FB |
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MC44011
28
MOTOROLA ANALOG IC DEVICE DATA
In addition to Table 7, the following guidelines apply:
a. To select the RGB inputs, both FC must be high and
RGB EN
must be low. Therefore, the RGB inputs can
be selected either by the I2C bus by leaving FC
permanently high, or by the FC input by leaving
Bit $80–7 permanently low. For overlay functions,
where high speed, well controlled switching is
necessary, the FC pin must be the controlling input.
b. When the R–Y, B–Y inputs are selected, either Y1 or Y2
must be selected, and the other must be deselected.
The YX input is automatically disabled in this mode.
c. In applications where the color difference inputs are
obtained from the NTSC/PAL decoder (from a
composite video signal), Y1 is used. The Y2 input is
normally used where alternately sourced color
difference signals are applied, either through the
MC44140 delay line, or through other external switching
to Pins 30 and 31.
In Figure 36, the bit numbers followed by “–0/5” indicate
DAC operated controls (contrast, brightness, etc.), which are
controlled by the I2C bus. The DACs have 6–bit resolution,
allowing 64 adjustment steps. Table 8 provides guidelines on
the DAC operation.
Table 8. DAC Operation – Color Difference Section
Function
Bits
RGB Outputs ($82–7 = 0)
YUV Outputs ($82–7 = 1)
Brightness
$84–0/5
Affects dc black and maximum levels of the three
outputs, but not the clamp level, nor the amplitude.
Affects dc black and white levels of the Y output
only, but not the clamp level, nor the amplitude.
DC – Red
DC – Blue
$85–0/5
$83–0/5
Fine tune the Red and Blue brightness levels.
Allows a small amount of color tint control (not to
be confused with hue).
Contrast
$81–0/5
Provides gain adjustment (black–to–white) of the
three outputs.
Provides gain adjustment of the three outputs.
Gain – Red
Gain – Blue
$82–0/5
$80–0/5
Fine tune the Red and Blue contrast levels.
Fine tune of the U and V gain levels.
V DC
U DC
$7E–0/5
$7D–0/5
Must be set to 00.
Should nominally be set to 32. This sets the dc
level of the U and V outputs at
≈
mid–scale.
Main Saturation
$86–0/5
Affects color saturation, except when the RGB
inputs bypass this section (YX EN = 0).
Affects color saturation levels of the UV outputs.
Does not affect the Y output.
30
390
1. = Clamp Circuit
2. Switches controlled by
I2C Interface – See Text.
31
R–Y
B–Y
YX
Inputs
B
G
R
$82–6
$80–7
Y1
(From Decoder)
F/C
R–Y
B–Y
Y2
$81–6
$81–7
YX
R
R–Y
B
G
G–Y
B–Y
Y
$82–7
Gain
($80–0/5)
U DC ($7D–0/5)
DC ($83–0/5)
G/Y
5.0
Outputs
R/V
5.0
5.0
V DC ($7E–0/5)
DC ($85–0/5)
$82–7
Brightness
$84–0/5
$82–0/5
Gain
Contrast
$81–0/5
Main Saturation
$86–0/5
C
C
C
C
C
C
26
27
28
Matrix
Decoder
22
21
20
29
25
B/U
Figure 36. Color Difference Stage and Outputs
NOTES:
390
390
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