CMOS 135 MHz True-Color Graphics
Triple 8-Bit Video RAM-DAC
a
ADV473
FEATURES
MODES
ADV478/ ADV471 (ADV®) Register Level Com patible
IBM PS/ 2,* VGA*/ XGA* Com patible
135 MHz Pipelined Operation
24-Bit True Color
8-Bit Pseudo Color
15-Bit True Color
8-Bit True Color
Triple 8-Bit D/ A Converters
Triple 256 ؋
8 (256 ؋
24) Color Palette RAM
Three 15 ؋
8 Overlay Registers
On-Board Voltage Reference
RS-343A/ RS-170 Com patible Analog Outputs
TTL Com patible Digital Inputs and Outputs
Sync on All Three Channels
Program m able Pedestal (0 or 7.5 IRE)
Standard MPU l/ O Interface
+5 V CMOS Monolithic Construction
68-Pin PLCC Package
SPEED GRADES
135 MHz, 110 MHz
80 MHz, 66 MHz
GENERAL D ESCRIP TIO N
T he ADV473 is a complete analog output, Video RAM-DAC
on a single CMOS monolithic chip. T he part is specifically
designed for true-color computer graphics systems.
T he ADV473 integrates a number of graphic functions onto one
device allowing 24-bit direct true-color operation at the maxi-
mum screen update rate of 135 MHz. It can also be used in
other modes, including 15-bit true color and 8-bit pseudo or in-
dexed color. T he ADV473 is fully PS/2 and VGA register level
compatible. It is also capable of implementing IBM’s XGA
standard.
APPLICATIONS
High Resolution Color Graphics
True-Color Visualization
CAE/ CAD/ CAM
Im age Processing
Desktop Publishing
(Continued on page 4)
FUNCTIO NAL BLO CK D IAGRAM
VREFIN
VREFOUT
SYNC
BLANK
S0
VOLTAGE
REFERENCE
GENERATOR
S1
P
I
X
E
L
OVERLAY PALETTE
15 x 8 RAM
8
8
8
VOLTAGE
REFERENCE
CONTROL
CIRCUIT
OL0
OL3
4
15 x 8 RAM
15 x 8 RAM
OVERLAYS
OPA
8
8
8
COLOR
PALETTE/
OVERLAY
PALETTE
SWITCHER
P
O
R
T
COLOR
PALETTE
D
A
C
SWITCHING
MATRIX &
PIXEL
RED
256 x 8
RAM
R0
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
RED
DAC
RED
IOR
IOG
IOB
R7
G0
G7
B0
B7
GREEN
256 x 8
RAM
MASK
GREEN
DAC
GREEN
BLUE
P
O
R
T
BLUE
256 x 8
RAM
8
BLUE
DAC
CLOCK
CR0
CR1
CR2
CR3
8
8
8
MPU & PIXEL
PORT
CONTROL LOGIC
MODE CONTROL
REGISTERS
PIXEL MASK
REGISTERS
GREEN
REG
BLUE
REG
RED
REG
ADDRESS
REG
MPU PORT
8
ADV473
D0–D7
RD WR
RS1 RS2
RS0
AD V is a registered tradem ark of Analog D evices Inc.
*P ersonal System /2 and VGA are tradem arks of International Business Machines Corp.
REV. A
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.
Tel: 617/ 329-4700 Fax: 617/ 326-8703