- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄373896 > AD725AR-REEL7 (ANALOG DEVICES INC) Low Cost RGB to NTSC/PAL Encoder with Luma Trap Port PDF資料下載
參數(shù)資料
| 型號： | AD725AR-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 顏色信號轉(zhuǎn)換 |
| 英文描述： | Low Cost RGB to NTSC/PAL Encoder with Luma Trap Port |
| 中文描述： | COLOR SIGNAL ENCODER, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大小： | 347K |
| 代理商： | AD725AR-REEL7 |
REV. 0
–12–
AD725
system, the internal 4FSC (14.318 180 MHz) clock that drives
the VGA controller can be used for 4FSC on the AD725. T his
signal is not directly accessible from outside the computer, but it
does appear on the VGA card. (A 1FSC-input encoder, the
AD724, is also available.)
If a separate RGB monitor is also to be used, it is not possible to
simply connect it to the R, G and B signals. T he monitor pro-
vides a termination that would double terminate these signals.
T he R, G, and B signals should be buffered by three amplifiers
with high input impedances. T hese should be configured for a
gain of two, which is normalized by the divide by two termina-
tion scheme used for the RGB monitor.
T he AD8073 is a low cost triple video amplifier that can pro-
vide the buffering required in this application. However, since
the R, G and B signals go all the way to ground during horizon-
tal sync, the AD8073 will require a –5 V supply to handle these
signals. T o be able to buffer the R, G and B signals using a
single supply, a rail-to-rail amplifier is required. In this applica-
tion, the AD8051 (single) and AD8052 (dual) can be used to
provide the three required channels. T hese can be operated on a
single supply of 3 V to 5 V.
Displaying VGA Output on a T V
T he AD725 can be used to convert the analog RGB output from a
personal computer’s VGA card to the NT SC or PAL television
standards. T o accomplish this it is important to understand that
the AD725 requires interlaced RGB video and clock rates that
are consistent with those required by the television standards.
In most computers the default output is a noninterlaced RGB
signal at a frame rate higher than used by either NT SC or PAL.
Most VGA controllers support a wide variety of output modes
that are controlled by altering the contents of internal registers.
It is best to consult with the VGA controller manufacturer to
determine the exact configuration required to provide an inter-
laced output at 60 Hz (50 Hz for PAL).
Figure 19 shows a circuit for connection to the VGA port of a
PC. T he RGB outputs are ac coupled to the respective inputs of
the AD725. T hese signals should each be terminated to ground
with 75
.
T he standard 15-pin VGA connector has HSYNC on Pin 13
and VSYNC on Pin 14. T hese signals also connect directly to
the same name signals on the AD725. For a synchronous NT SC
75
V
75
V
–5V
4FSC
+5V
0.1
m
F
+5V (V
AA
)
AGND
DGND
AD725
CE
RIN
GIN
BIN
HSYNC
VSYNC
CRMA
LUMA
CMPS
APOS
DPOS
0.1
m
F
10
m
F
0.1
m
F
10
m
F
75
V
75
V
75
V
220
m
F
COMPOSITE
VIDEO
75
V
220
m
F
75
V
220
m
F
Y
C
S-VIDEO
(Y/C VIDEO)
75
V
75
V
75
V
B
G
R
RGB MONITOR
VSYNC
HSYNC
FROM VGA PORT
+5V
POWER DOWN
75
V
+5V
VGA OUTPUT
CONNECTOR
14
15
16
6
7
8
9
10
11
4
5
1k
V
1k
V
13
2
0.1
m
F
0.1
m
F
0.1
m
F
OSC
4FSC CLOCK
14.318180MHz (NTSC)
OR
17.734475MHz (PAL)
1/3
AD8073
75
V
1k
V
1k
V
1/3
AD8073
1/3
AD8073
1k
V
1k
V
68
m
H
STND
YTRAP
18pF
9pF
0.1
m
F
47k
V
1N4148
NTSC/
PAL
0.1
m
F
Figure 19. Interfacing the AD725 to the (Interlaced) VGA Port of a PC
相關PDF資料 |
PDF描述 |
|---|---|
| AD725-EB | Precision, Quad, SPST Analog Switches |
| AD725AR | Low Cost RGB to NTSC/PAL Encoder with Luma Trap Port |
| AD725 | Low Cost RGB to NTSC/PAL Encoder with Luma Trap Port(低成本RGB-NTSC/PAL編碼器) |
| AD7266 | Differential Input, Dual 2 MSPS, 12-Bit, 3-Channel SAR ADC |
| AD7266ACP | Differential Input, Dual 2 MSPS, 12-Bit, 3-Channel SAR ADC |
相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD725ARZ | 功能描述:IC ENCODER RGB TO NTSC 16-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
| AD725ARZ | 制造商:Analog Devices 功能描述:Video IC |
| AD725ARZ-R7 | 功能描述:IC ENCODER RGB TO NTSC 16-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
| AD725ARZ-RL | 功能描述:IC ENCODER RGB TO NTSC 16-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
| AD725ATQ | 制造商:Analog Devices 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復。