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參數(shù)資料
| 型號： | MC13081 |
| 廠商： | Motorola, Inc. |
| 英文描述： | MULTIMODE COLOR MONITOR PROCESSOR |
| 中文描述： | 多模彩色監(jiān)視器處理器 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大?。?/td> | 342K |
| 代理商： | MC13081 |
MC13081X
13
MOTOROLA ANALOG IC DEVICE DATA
means, the overall adjustment is about 70% to 130%, which
provides additional
±
10% margin.
During normal operation, the frequency switch will switch
“off” when the pin voltage falls 60 mV below the 5.0 V
reference voltage (
≈
4.94 V), and will switch “on” when the pin
voltage rises to 40 mV above the 5.0 V reference (
≈
5.04 V).
An Example: Require Trip Point @ 35 kHz
35 x 103
122
I12
μ
A
Trip Point Reference Current
I12
2
35 k
122 x 2
μ
A
Ra
Rb
5.0 V
35 k
122 x 2
μ
A
34857
Hysteresis @ 35 kHz
5.04 – 4.94 V
34857
x122 Hz
μ
A
350 Hz
From above, Ra + Rb = 34857
Select Ra = 24 k, and Rb = 20 k Trim Pot
The Temperature Coefficient of the potentiometer can also
be considered. If the value of the potentiometer and Ra vary
by 1% (for example) over temperature, the error would be:
5 x
348571
1
34857 x 1.01
x122 Hz
μ
A
350 Hz
6. Horizontal Position Compensation for Selected Scan
Frequency in Using FHA Switch
Refering to Figure1 (block diagram), there is an output
from the FHA switch to the horizontal drive output. When the
FHA switch is switched on, at a specified horizontal
frequency, there is a 1/8th horizontal line shift of H–Ramp1.
Referring to Figures 5 and 9, a shift of H–Ramp1 will result in
a shift of the H–Drive output timing with respect to flyback
input.
The exact H–Drive output shift will be determined by the
PD2 voltage (Pin 45), which is generated by the flyback input
and the internal Comp1 output. That is related to the H–Drive
output transistor storage time.
This function is particularly useful for high frequency scan
rates. The higher the frequency, the more significant the
storage time becomes, compared to the horizontal scan time.
Figure 5.
X
To Be Determined
By Application
H–Sync
H–Drive
Without
Shift
H–Drive
With FHA
On
7. Proper Horizontal Phase Control
The horizontal adjustment range depends on the phase
angle between the H–Sync signal and the horizontal flyback
input. In reality, the actual adjustment range is a
combination of horizontal frequency, front porch/back porch
timing, flyback pulse width, and horizontal output transistor
storage time. The following paragraph conveys the concept
for normal operation.
There are two clamping situations for video signals. In
case 1, separate VTTL and HTTL sync are provided, the
video signal is clamped at sync tip, and the dc voltage built up
is used for black level reference. In this instance, the clamp
pulse has the same pulse width as H–Sync, and nearly the
same position. This clamp pulse is blanked out internally. In
order to allow the video output to complete the blanking
action during horizontal retrace, the horizontal phase should
not be over–adjusted. See Figure 6 for a pictorial perception.
Accordingly, the total horizontal position adjustment range is
calculated as the sum of
t1 and
t2.
Should the phase of horizontal flyback/H–Sync move
further left or right from the normal adjustment range, the black
level reference voltage will be restored, and consequently a
slightly brighter than screen dark region will be observed
on–screen. See Figure 7 for pictorial explanation.
Horizontal Blanking Time
| t1|
THB
2
| t2|
THB
2
FPtime
+ BPtime = THB
Sync Width
Criterion for Normal Operation:
In other words, the left/right 0.7 V threshold flyback
reference should be within the H–Sync pulse (shaded area
of Figure 6).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC13081X | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Multimode Color Monitor Horizontal, Vertical, and Video Combination Processor |
| MC13081XB | 制造商:Panasonic Industrial Company 功能描述:IC |
| MC1309 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:PHASE LOCK LOOP FM STEREO DEMODULATOR |
| MC1309P | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:PHASE LOCK LOOP FM STEREO DEMODULATOR |
| MC-130A-AC400V | 制造商:Altech Corporation 功能描述: |
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