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參數(shù)資料
| 型號： | ML6430 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Genlocking Sync Generator with Digital Audio Clock for NTSC, PAL & VGA(用于NTSC, PAL & VGA數(shù)字式音頻同步時鐘發(fā)生器) |
| 中文描述： | 同步鎖相同步發(fā)生器用于NTSC，PAL與數(shù)字音頻時鐘 |
| 文件頁數(shù)： | 12/33頁 |
| 文件大?。?/td> | 384K |
| 代理商： | ML6430 |
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ML6430/ML6431
12
FUNCTIONAL DESCRIPTION
(Continued)
FREERUN MODE
Both the ML6430 and ML6431 can be used in Freerun
mode. The ML6431 is recommended for applications
requiring a more robust Freerun mode of operations.
Figure 4 and Figure 4a describe the state diagrams for
both the ML6430 and ML6431. Note that the ML6431
includes a faster path to go from FREERUN MODE #1 to
FREERUN MODE #2.
Freerun mode:
FREERUN MODE #1 is entered when
the freerun pin is toggled high while the ML6430/
ML6431 is horizontally locked (i.e. internal horizontal
locked signal is present). In this mode, the digital
frequency value stored in the line-locked PLL is held
and the ML6430/ML6431 will freerun at a frequency
very close to that of the last locked video source.
Freerun mode #1 is best used by physically tying the
NoSignal pin to the freerun pin as shown in Figures
9
or 10. FREERUN MODE #2 is entered when the
freerun pin is toggled high while the ML6430/Ml6431
is not horizontally locked to a video source. In this
mode, a ROM lookup table is used to set the freerun
frequency of the ML6430/ML6431. In this mode the
output frequency is as accurate as the Crystal plus the
accuracy of the look up table. See Figures 4 and 4a
for the NoSignal-Locked-Freerun state machine
diagram.
NoSignal:
NoSignal will go low if video is present for
one entire field. NoSignal will be high if video is not
present for one entire field.
Locked (ML6430):
The ML6430 must be line
(horizontal) locked to an input video source and also
be vertically locked before the locked detect signal
goes high. When a video source is removed, the
locked signal may be high or low. Please note that the
locked pin is the logical AND of the internal
horizontal locked and vertical locked signals. For
example, the internal horizontal locked signal may be
high even though the locked pin is asserted low.
INPUT VIDEO
WITHIN ±6%
RANGE
POWER UP
ML6430 W/
FREERUN PIN
"LOW" (TYPICAL)
POWER UP
ML6430 W/
FREERUN PIN
"HIGH" (TYPICAL)
IF NO VIDEO
FOR > 1 FRAME
TOGGLE
FREERUN PIN
"HIGH"
TOGGLE
FREERUN PIN
"HIGH"
TOGGLE
FREERUN PIN
"HIGH"
IF INPUT VIDEO
FOR > 1 FRAME
FREERUN PIN
"LOW"
IF NO VIDEO
FOR > 1 FRAME
FREERUN PIN
"LOW"
IF INPUT VIDEO
FOR > 1 FRAME
TOGGLE
FREERUN PIN
"HIGH"
INPUT VIDEO
OUTSIDE ±6%
RANGE
HORIZONTAL
LOCKED
NO SIGNAL
PRESENT
3
FREERUN
MODE #1
5
HORIZONTAL
LOCKED
SIGNAL
PRESENT
2
HORIZONTAL
UNLOCKED
NO SIGNAL
PRESENT
4
FREERUN
MODE #2
6
HORIZONTAL
UNLOCKED
SIGNAL
PRESENT
1
Figure 4. ML6430 Freerun Mode State Diagram
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| ML6431 | Genlocking Sync Generator with Digital Audio Clock for NTSC, PAL & VGA(用于NTSC, PAL & VGA數(shù)字式音頻同步時鐘發(fā)生器) |
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
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| ML6431CH | 制造商:Rochester Electronics LLC 功能描述: |
| ML6431CH WAF UP | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML643RAU111MLZ | 制造商:COILCRAFT 制造商全稱:Coilcraft lnc. 功能描述:High-Reliability Air Core Inductors |
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