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參數(shù)資料
| 型號(hào)： | ADV7123 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | CMOS, 240 MHz Triple 10-Bit High Speed Video DAC(240MHz三通道10位高速視頻D/A轉(zhuǎn)換器) |
| 中文描述： | 的CMOS，240 MHz的三路10位高速視頻DAC（240MHz的三通道10位高速視頻的D / A轉(zhuǎn)換器） |
| 文件頁數(shù)： | 13/16頁 |
| 文件大小： | 318K |
| 代理商： | ADV7123 |
ADV7123
–13–
REV. A
CIRCUIT DESCRIPTION AND OPERATION
The ADV7123 contains three 10-bit D/A converters, with three
input channels, each containing a 10-bit register. Also integrated
on board the part is a reference amplifier. CRT control functions
BLANK
and
SYNC
are integrated on board the ADV7123.
Digital Inputs
Thirty bits of pixel data (color information) R0–R9, G0–G9 and
B0–B9 are latched into the device on the rising edge of each
clock cycle. This data is presented to the three 10-bit DACs and
then converted to three analog (RGB) output waveforms. See
Figure 20.
CLOCK
DATA
ANALOG OUTPUTS
(IOR, IOR, IOB
IOR
,
IOG
,
IOB
)
DIGITAL INPUTS
(R9-R0, G9-G0, B9-B0,
SYNC
,
BLANK
)
Figure 20. Video Data Input/Output
The ADV7123 has two additional control signals that are
latched to the analog video outputs in a similar fashion.
BLANK
and
SYNC
are each latched on the rising edge of CLOCK to
maintain synchronization with the pixel data stream.
The
BLANK
and
SYNC
functions allow for the encoding of
these video synchronization signals onto the RGB video output.
This is done by adding appropriately weighted current sources
to the analog outputs, as determined by the logic levels on the
BLANK
and
SYNC
digital inputs. Figure 21 shows the analog
output, RGB video waveform of the ADV7123. The influence of
SYNC
and
BLANK
on the analog video waveform is illustrated.
Table I details the resultant effect on the analog outputs of
BLANK
and
SYNC
.
All these digital inputs are specified to accept TTL logic levels.
Clock Input
The CLOCK input of the ADV7123 is typically the pixel clock
rate of the system. It is also known as the dot rate. The dot rate,
and hence the required CLOCK frequency, will be determined
by the on-screen resolution, according to the following equation:
Dot Rate
= (
Horiz Res
)
×
(
Vert Res
)
×
(
Refresh Rate
)/
(
Retrace Factor
)
Horiz Res
= Number of Pixels/Line.
Vert Res
= Number of Lines/Frame.
Refresh Rate
= Horizontal Scan Rate. This is the rate at
which the screen must be refreshed,
typically 60 Hz for a noninterlaced sys-
tem or 30 Hz for an interlaced system.
Retrace Factor
= Total Blank Time Factor. This takes into
account that the display is blanked for a
certain fraction of the total duration of
each frame (e.g., 0.8).
Table I. Video Output Truth Table (R
SET
= 530
V
, R
LOAD
= 37.5
V
)
DAC
Input Data
Description
IOG (mA)
IOG
(mA)
IOR/IOB
IOR/IOB
SYNC
BLANK
WHITE LEVEL
VIDEO
VIDEO to BLANK
BLACK LEVEL
BLACK to BLANK
BLANK LEVEL
SYNC
LEVEL
26.67
Video + 8.05
Video
8.05
0
8.05
0
0
18.62 – Video
18.62 – Video
18.62
18.62
18.62
18.62
18.62
Video
Video
0
0
0
0
0
18.62 – Video
18.62 – Video
18.62
18.62
18.62
18.62
1
1
0
1
0
1
0
1
1
1
1
1
0
0
3FFH
Data
Data
000H
000H
xxxH
xxxH
RED, BLUE
GREEN
mA
V
mA
V
18.62
0.7
26.67
1.000
0
0
8.05
0.3
0
0
WHITE LEVEL
BLANK
LEVEL
SYNC
LEVEL
100 IRE
43 IRE
NOTES:
1. OUTPUTS CONNECTED TO A DOUBLY TERMINATED 75
V
LOAD.
2. V
REF
= 1.235V, R
SET
= 530
V
.
3. RS-343A LEVELS AND TOLERANCES ASSUMED ON ALL LEVELS.
Figure 21. RGB Video Output Waveform
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADV7123JST240 | 制造商:Rochester Electronics LLC 功能描述:TRIPLE HIGH SPEED VIDEO DAC I.C. - Bulk 制造商:Analog Devices 功能描述:IC 10-BIT VIDEO DAC |
| ADV7123JST240-REEL | 制造商:Rochester Electronics LLC 功能描述:TRIPLE HIGH SPEED VIDEO DAC I.C. - Tape and Reel 制造商:Analog Devices 功能描述: |
| ADV7123JST330 | 制造商:Rochester Electronics LLC 功能描述:TRIPLE HIGH SPEED VIDEO DAC I.C. - Bulk 制造商:Analog Devices 功能描述:IC 10-BIT VIDEO DAC |
| ADV7123JSTZ240 | 功能描述:IC DAC VIDEO TRPL HI SPD 48-LQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 設(shè)置時(shí)間:4µs 位數(shù):12 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-uMAX 包裝:管件 輸出數(shù)目和類型:2 電壓，單極 采樣率（每秒）:* 產(chǎn)品目錄頁面:1398 (CN2011-ZH PDF) |
| ADV7123JSTZ240 | 制造商:Analog Devices 功能描述:D/A Converter (D-A) IC |
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