数据搜索系统,热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

ADV7120KSTZ50 数据表(PDF) 6 Page - Analog Devices

部件名 ADV7120KSTZ50
功能描述  CMOS 80 MHz, Triple 8-Bit Video DAC
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADV7120KSTZ50 数据表(HTML) 6 Page - Analog Devices

Back Button ADV7120KSTZ50 Datasheet HTML 2Page - Analog Devices ADV7120KSTZ50 Datasheet HTML 3Page - Analog Devices ADV7120KSTZ50 Datasheet HTML 4Page - Analog Devices ADV7120KSTZ50 Datasheet HTML 5Page - Analog Devices ADV7120KSTZ50 Datasheet HTML 6Page - Analog Devices ADV7120KSTZ50 Datasheet HTML 7Page - Analog Devices ADV7120KSTZ50 Datasheet HTML 8Page - Analog Devices ADV7120KSTZ50 Datasheet HTML 9Page - Analog Devices ADV7120KSTZ50 Datasheet HTML 10Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 6 / 12 page
background image
ADV7120
REV. B
–6–
TERMINOLOGY
Blanking Level
The level separating the SYNC portion from the video portion
of the waveform. Usually referred to as the front porch or back
porch. At 0 IRE units, it is the level which will shut off the pic-
ture tube, resulting in the blackest possible picture.
Color Video (RGB)
This usually refers to the technique of combining the three pri-
mary colors of red, green and blue to produce color pictures
within the usual spectrum. In RGB monitors, three DACs are
required, one for each color.
Sync Signal (SYNC)
The position of the composite video signal which synchronizes
the scanning process.
Gray Scale
The discrete levels of video signal between reference black and
reference white levels. An 8-bit DAC contains 256 different lev-
els while a 6-bit DAC contains 64.
Raster Scan
The most basic method of sweeping a CRT one line at a time to
generate and display images.
Reference Black Level
The maximum negative polarity amplitude of the video signal.
Reference White Level
The maximum positive polarity amplitude of the video signal.
Sync Level
The peak level of the SYNC signal.
Video Signal
That portion of the composite video signal which varies in gray
scale levels between reference white and reference black. Also
referred to as the picture signal, this is the portion which may be
visually observed.
CIRCUIT DESCRIPTION AND OPERATION
The ADV7120 contains three 8-bit D/A converters, with three
input channels each containing an 8-bit register. Also inte-
grated on board the part is a reference amplifier and CRT con-
trol functions BLANK, SYNC and REF WHITE.
Digital Inputs
24-bits of pixel data (color information) R0–R7, G0–G7 and
B0–B7 are latched into the device on the rising edge of each
clock cycle. This data is presented to the three 8-bit DACs and
is then converted to three analog (RGB) output waveforms.
(See Figure 2.)
Three other digital control signals are latched to the analog
video outputs in a similar fashion. BLANK, SYNC and REF
WHITE 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 3 shows the analog
output, RGB video waveform of the ADV7120. The influence
of SYNC and BLANK on the analog video waveform is
illustrated.
The REF WHITE control input drives the RGB video outputs
to the white level. This function could be used to overlay a cur-
sor or crosshair onto the RGB video output.
Table I details the resultant effect on the analog outputs of
BLANK
, SYNC and REF WHITE.
All these digital inputs are specified to accept TTL logic levels.
Clock Input
The CLOCK input of the ADV7120 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, typi-
cally 60 Hz for a noninterlaced system or
30 Hz for an interlaced system.
Retrace Factor
=
Total blank time factor. This takes into ac-
count that the display is blanked for a cer-
tain fraction of the total duration of each
frame (e.g., 0.8).
CLOCK
ANALOG OUTPUTS
(IOR, IOG, IOB, I
SYNC )
DIGITAL INPUTS
(R0-R7, G0-G7, B0-B7;
SYNC, BLANK,
REF WHITE)
DATA
Figure 2. Video Data Input/Output


类似零件编号 - ADV7120KSTZ50

制造商部件名数据表功能描述
logo
Analog Devices
ADV7120KSTZ30 AD-ADV7120KSTZ30 Datasheet
191Kb / 12P
   CMOS 80 MHz, Triple 8-Bit Video DAC
REV. B
More results

类似说明 - ADV7120KSTZ50

制造商部件名数据表功能描述
logo
Analog Devices
ADV101 AD-ADV101_15 Datasheet
161Kb / 12P
   CMOS 80 MHz, Triple 8-Bit Video DAC
REV. B
ADV101 AD-ADV101 Datasheet
187Kb / 12P
   CMOS 80 MHz, Triple 8-Bit Video DAC
REV. B
ADV7120 AD-ADV7120_15 Datasheet
191Kb / 12P
   CMOS 80 MHz, Triple 8-Bit Video DAC
REV. B
ADV7120KSTZ30 AD-ADV7120KSTZ30 Datasheet
191Kb / 12P
   CMOS 80 MHz, Triple 8-Bit Video DAC
REV. B
ADV7120 AD-ADV7120 Datasheet
188Kb / 12P
   CMOS 80 MHz, Triple 8-Bit Video DAC
REV. B
ADV7128 AD-ADV7128 Datasheet
135Kb / 8P
   CMOS 80 MHz, 10-Bit Video DAC
REV. 0
ADV7128 AD-ADV7128_15 Datasheet
139Kb / 8P
   CMOS 80 MHz, 10-Bit Video DAC
REV. 0
ADV7125 AD-ADV7125 Datasheet
264Kb / 12P
   CMOS, 330 MHz Triple 8-Bit High Speed Video DAC
REV. 0
ADV7125 AD-ADV7125_15 Datasheet
293Kb / 16P
   CMOS, 330 MHz Triple 8-Bit High Speed Video DAC
Rev. C
ADV7125 AD-ADV7125_11 Datasheet
293Kb / 16P
   CMOS, 330 MHz Triple 8-Bit High Speed Video DAC
REV. C
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12


数据表 下载

Go To PDF Page


链接网址




隐私政策
ALLDATASHEETCN.COM
ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   链接交换   |   制造商名单
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com