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參數資料
| 型號： | ADV476KN50 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 顯示控制器 |
| 英文描述： | Circular Connector; No. of Contacts:66; Series:LJTP02R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:19; Circular Contact Gender:Pin; Circular Shell Style:Box Mount Receptacle; Insert Arrangement:19-35 |
| 中文描述： | PALETTE-DAC DSPL CTLR, PDIP28 |
| 封裝： | 0.600 INCH, PLASTIC, DIP-28 |
| 文件頁數： | 8/12頁 |
| 文件大小： | 175K |
| 代理商： | ADV476KN50 |
ADV476
REV. B
–8–
Figure 5. RGB Video Output Waveform
T able V. Video Output T ruth T able
RE D, GRE E N,
BLUE , (mA)
1
DAC
Input Data
Description
BLANK
WHIT E LEVEL
VIDEO
BLACK LEVEL
BLANK LEVEL
19.05
Video
0
0
1
1
1
0
FFH
DAT A
00H
xxH
NOT E
1
T ypical with full Scale RED, GREEN, BLUE = 19.05 mA. I
REF
= 8.88 mA.
Reference Input
T he ADV476 requires an active current reference to enable the
DACs provide stable and accurate video output levels. T he rela-
tionship between the output voltage and the required input ref-
erence current is given by:
I
REF
=
VO
(
FULL SCALE
)
2.15
×
R
L
= 37.5
(for doubly terminated 75
load)
= 75
(for singly terminated 75
load)
VO
= 0.714 V
(RS-343A video levels)
= 1.0 V
(RS-170 video levels).
In a standard application which requires RS-343A video levels
to be driven into a doubly terminated 75
load (R
L
= 37.5
),
the necessary reference input current is:
I
REF
= 8.88
mA
.
T o drive the same levels into a singly terminated 75
load
(R
L
= 75
), the reference current is:
I
REF
= 4.44
mA
.
A suggested current reference design for the doubly terminated
case, with RS-343A video levels and based on the LM334, a
three-terminal adjustable current source, is shown in Figure 6.
where
R
L
and
Figure 6. Current Reference Design Using an LM334
Current Source
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相關代理商/技術參數 |
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| ADV476KN50E | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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