ANALOG
W DEVICES
CMOS MHzTrue-Color raphics
135
G
Triplea-BitVideoRAM-DAC
ADV473
(
MODES
24-Bit True Color
8-Bit Pseudo Color
15-Bit True Color
8-Bit True Color
FEATURES
ADV478/ADV471(ADV@)
Register level Compatible
IBMPS/2, * VGA*/XGA* Compatible
135 MHz Pipelined Operation
Triple 8-Bit D/A Converters
Triple 256 x 8 (256 x 24) Color Palette RAM
Three 15 x 8 Overlay Registers
On-Board Voltage Reference
RS-343A/RS-170 Compatible Analog Outputs
TTl Compatible Digital Inputs and Outputs
Sync on All Three Channels
Programmable Pedestal (0 or 7.5 IRE)
Standard MPU I/O Interface
+5 V CMOS Monolithic Construction
68-Pin PlCC Package
SPEED GRADES
135 MHz, 110 MHz
80 MHz, 66 MHz
OBS
APPLICATIONS
High Resolution Color Graphics
True-Color Visualization
CAE/CAD/CAM
Image Processing
Desktop Publishing
SYNC
Eii:ANK
SO
S1
OVERLAYS
a
The ADV473 integrates number of graphic functions onto one
device allowing 24-bit direct true-color operation at the maximum screen update rate of 13S MHz. It can also be used in
other modes, induding IS-bit true color and 8-bit pseudo or
indexed color. The ADV473 is fully PS/2 and VGA register
level compatible. It is also capable of implementing IBM's XGA
standard.
(Continued on page 4)
OLE
FUNCTIONAL
(
GENERAL DESCRIPTION
The ADV473 is a complete analog output, Video RAM-DAC
on a single CMOS monolithic chip. The part is specifically
designed for true-color computer graphics systems.
TE
BLOCK DIAGRAM
VREFIN
VREFOUT
=t=
VOLTAGE
REFERENCE
GENERATOR
OLO
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Ola
1--+0 OPA
RO
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R7
8
RED
GO
I
G7
8
GREEN
BLUE
BO
I
B7
8.
lOR
lOG
lOB
CLOCK
CRO
CR1
CR2
cRa
ADV473
Do-D7
ADV is a registered trademark of Analog Devices Inc.
.Personal System/2 and VGA are trademarks of International
Business Machines
REV. A
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.
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RD
WR
RSO RS1
I
RS2
Corp.
One Technology Way, P.O. Box 9106, Norwood,
Tel: 617/329-4700
MA 02062-9106, U.S.A.
Fax: 617/326-8703
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