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PDF ( 数据手册 , 数据表 ) ADV478

零件编号 ADV478
描述 CMOS 80 MHz Monolithic 256 x 24(18) Color Palette RAM-DACs
制造商 Analog Devices
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ADV478 数据手册, 描述, 功能
a
CMOS 80 MHz Monolithic 256 ؋ 24(18)
Color Palette RAM-DACs
ADV478/ADV471
FEATURES
Personal System/2* Compatible
FUNCTIONAL BLOCK DIAGRAM
80 MHz Pipelined Operation
Triple 8-Bit (6-Bit) D/A Converters
256 ؋ 24(18) Color Palette RAM
15 ؋ 24(18) Overlay Registers
RS-343A/RS-170 Compatible Outputs
Sync on All Three Channels
Programmable Pedestal (0 or 7.5 IRE)
External Voltage or Current Reference
Standard MPU Interface
+5 V CMOS Monolithic Construction
44-Pin PLCC Package
Power Dissipation: 800 mW
OAPPLICATIONS
BHigh Resolution Color Graphics
SCAE/CAD/CAM Applications
Image Processing
OInstrumentation
Desktop Publishing
LAVAILABLE CLOCK RATES
E80 MHz
T66 MHz
E50 MHz
35 MHz
GENERAL DESCRIPTION
The ADV478 (ADV®) and ADV471 are pin compatible and
software compatible RAM-DACs designed specifically for
Personal System/2 compatible color graphics.
The ADV478 has a 256 × 24 color lookup table with triple 8-bit
video D/A converters. It may be configured for either 6 bits or
8 bits per color operation. The ADV471 has a 256 × 18 color
lookup table with triple 6-bit video D/A converters.
Options on both parts include a programmable pedestal (0 or
7.5 IRE) and use of an external voltage or current reference.
ADV is a registered trademark of Analog Devices, Inc.
*Personal System/2 is a trademark of International Business Machines Corp.
Fifteen overlay registers provide for overlaying cursors, grids,
menus, EGA emulation, etc. Also supported is a pixel read
mask register and sync generation on all three channels.
The ADV478 and ADV471 generate RS-343A compatible
video signals into a doubly terminated 75 load, and RS-170
compatible video signals into a singly terminated 75 load,
without requiring external buffering. Differential and integral
linearity errors are guaranteed to be a maximum of ± 1 LSB for
the ADV478 and ± 1/4 LSB for the ADV471 over the full tem-
perature range.
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







ADV478 pdf, 数据表
ADV478/ADV471
ADV478 Data Bus Interface
On the ADV478, the 8/6 control input is used to specify whether
the MPU is reading and writing 8 bits (8/6 = logical one) or 6
bits (8/6 = logical zero) of color information each cycle.
For 8-bit operation, Do is the LSB and D7 is the MSB of color
data.
Frame Buffer Interface
The P0–P7 and OL0–OL3 inputs are used to address the color
palette RAM and overlay registers, as shown in Table III.
Table III. Pixel and Overlay Control Truth Table (Pixel Read
Mask Register = FFH)
For 6-bit operation (and also when using the ADV471), color
OL0–OL3 P0–P7 Addressed by Frame Buffer
data is contained on the lower six bits of the data bus, with D0
being the LSB and D5 the MSB of color data. When writing
0H
00H Color Palette RAM Location 00H
color data, D6 and D7 are ignored. During color read cycles,
0H
01H Color Palette RAM Location 01H
D6 and D7 will be a logical zero.
••
••
ADV471 Data Bus Interface
0H
FFH
Color Palette RAM Location FFH
Color data is contained on the lower six bits of the data bus,
with D0 being the LSB and D5 the MSB of color data. When
writing color data, D6 and D7 are ignored. During color read
OBSOLETEcycles, D6 and D7 will be a logical zero.
1H
2H
FH
XXH
XXH
XXH
Overlay Color 1
Overlay Color 2
Overlay Color 15
Fiqure 3. Composite Video Output Waveform (SETUP = VAA)
Table IV. Video Output Truth Table (SETUP= VAA)
Description
WHITE LEVEL
DATA
DATA-SYNC
BLACK LEVEL
BLACK-SYNC
BLANK LEVEL
SYNC LEVEL
IOUT (mA)1
26.67
data + 9.05
data + 1.44
9.05
1.44
7.62
0
SYNC
1
1
0
1
0
1
0
NOTES
1Typical with full-scale IOG = 26.67 mA, SETUP = VAA.
External voltage or current reference adjusted for 26.67 mA full-scale output.
BLANK
1
1
1
1
1
0
0
DAC
Input Data
FFH
data
data
00H
00H
xxH
xxH
–8– REV. B














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