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ADV101 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADV101
Beschreibung CMOS 80 MHz/ Triple 8-Bit Video DAC
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 12 Seiten
ADV101 Datasheet, Funktion
a
CMOS
80 MHz, Triple 8-Bit Video DAC
ADV101*
FEATURES
80 MHz Pipelined Operation
Triple 8-Bit D/A Converters
RS-343A/RS-170 Compatible Outputs
TTL Compatible Inputs
+5 V CMOS Monolithic Construction
40-Pin DIP or 44-Pin PLCC Package
Plug-In Replacement for BT101
Power Dissipation: 400 mW
APPLICATIONS
High Resolution Color Graphics
CAE/CAD/CAM Applications
Image Processing
Instrumentation
Video Signal Reconstruction
Desktop Publishing
SPEED GRADES
80 MHz
50 MHz
30 MHz
GENERAL DESCRIPTION
The ADV101 is a digital-to-analog video converter on a single
monolithic chip. The part is specifically designed for high reso-
lution color graphics and video systems. It consists of three,
high speed, 8-bit, video D/A converters (RGB); a standard TTL
input interface and high impedance, analog output, current
sources.
The ADV101 has three separate, 8-bit, pixel input ports, one
each for red, green and blue video data. Additional video input
controls on the part include sync, blank and reference white. A
single +5 V supply, an external 1.23 V reference and pixel clock
input are all that are required to make the part operational.
The ADV101 is capable of generating RGB video output sig-
nals, which are compatible with RS-343A and RS-170 video
standards, without requiring external buffering.
The ADV101 is fabricated in a +5 V CMOS process. Its mono-
lithic CMOS construction ensures greater functionality with low
power dissipation. The part is packaged in both a 0.6", 40-pin
plastic DIP and a 44-pin plastic leaded (J-lead) chip carrier,
PLCC.
FUNCTIONAL BLOCK DIAGRAM
FS
VAA ADJUST VREF
CLOCK
ADV101
REFERENCE
AMPLIFIER
COMP
R0
R7
PIXEL
INPUT
PORT
G0
G7
B0
B7
RED
8
8 REGISTER
GREEN 8
8 REGISTER
BLUE
8
8 REGISTER
DAC
DAC
DAC
IOR
IOG
IOB
REF WHITE
BLANK
SYNC
CONTROL
REGISTER
SYNC
CONTROL
ISYNC
GND
PRODUCT HIGHLIGHTS
1. Fast video refresh rate, 80 MHz.
2. Compatible with a wide variety of high resolution color
graphics video systems.
3. Guaranteed monotonic with a maximum differential nonlin-
earity of ± 0.5 LSB. Integral nonlinearity is guaranteed to be
a maximum of ± 1 LSB.
*ADV is a registered trademark of Analog Devices Inc.
REV. B
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703






ADV101 Datasheet, Funktion
ADV101
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 re-
ferred to as the picture signal, this is the portion which may be
visually observed.
CIRCUIT DESCRIPTION AND OPERATION
The ADV101 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 ADV101. 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 ADV101 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)/
Dot 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 certain
fraction of the total duration of each frame
(e.g., 0.8).
CLOCK
DIGITAL INPUTS
(R0–R7, G0–G7, B0–B7;
SYNC, BLANK,
REFWHITE)
DATA
ANALOG OUTPUTS
(IOR, IOG, IOB, ISYNC )
Figure 2. Video Data Input/Output
–6– REV. B

6 Page









ADV101 pdf, datenblatt
ADV101
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
44-Terminal Plastic Leaded Chip Carrier
(P-44A)
40-Pin Plastic DIP
(N-40A)
–12–
REV. B

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