ADV473_15 Datasheet, PDF (1/12 Pages) Analog Devices – CMOS 135 MHz True-Color Graphics Triple 8-Bit Video RAM-DAC

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CMOS 135 MHz True-Color Graphics
Triple 8-Bit Video RAM-DAC
ADV473
FEATURES
ADV478/ADV471 (ADV^®) Register Level Compatible
IBM PS/2,* VGA*/XGA* Compatible
135 MHz Pipelined Operation
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 Compatible Analog Outputs
TTL Compatible Digital Inputs and Outputs
Sync on All Three Channels
Programmable Pedestal (0 or 7.5 IRE)
Standard MPU l/O Interface
+5 V CMOS Monolithic Construction
68-Pin PLCC Package
APPLICATIONS
High Resolution Color Graphics
True-Color Visualization
CAE/CAD/CAM
Image Processing
Desktop Publishing
MODES
24-Bit True Color
8-Bit Pseudo Color
15-Bit True Color
8-Bit True Color
SPEED GRADES
135 MHz, 110 MHz
80 MHz, 66 MHz
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.
The 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. 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)
FUNCTIONAL BLOCK DIAGRAM
V_REFIN
V_REFOUT
SYNC
BLANK
S0
S1
OL0
OVERLAYS
OL3
R0
RED
R7
G0
GREEN
G7
B0
BLUE
B7
P
I
4_X
E
L
P
8 O8
R
T
8
8
8
8
OVERLAY PALETTE
8
15 x 8 RAM
8
15 x 8 RAM
8
15 x 8 RAM
SWITCHING ₈
MATRIX &
PIXEL
MASK
8
8
8
8
8
COLOR
COLOR
PALETTE/
D
RED
256 x 8
PALETTE ₈
OVERLAY ⁸
A
RAM
PALETTE
C
GREEN
256 x 8
RAM
8
SWITCHER ₈
P
BLUE
256 x 8
8
RAM
O
8
R
T
VOLTAGE
REFERENCE
GENERATOR
VOLTAGE
REFERENCE
CONTROL
CIRCUIT
8
RED
DAC
8
GREEN
DAC
8
BLUE
DAC
OPA
IOR
IOG
IOB
CLOCK
MODE CONTROL PIXEL MASK
REGISTERS
REGISTERS
8
RED
REG
8
GREEN
REG
8
BLUE
REG
MPU PORT
8
ADDRESS
REG
MPU & PIXEL
PORT
CONTROL LOGIC
ADV473
CR0
CR1
CR2
CR3
D0–D7
RD WR RS0 RS1 RS2
ADV is a registered trademark of Analog Devices Inc.
*Personal System/2 and VGA are trademarks of International Business Machines Corp.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
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