ADV7152LS135 데이터 시트보기 (PDF) - Analog Devices
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ADV7152LS135 Datasheet PDF : 32 Pages
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ADV7152
(Continued from page 1) An external ECL oscillator source with differential outputs is all
applications. The part is controlled and programmed through
the microprocessor (MPU) port. The part also contains a num-
ber of onboard test registers, associated with self diagnostic test-
that is required to drive the CLOCK and CLOCK inputs of the
ADV7152. The part can also be driven by an external clock
generator chip circuit, such as the AD730.
ing of the device.
The ADV7152 is capable of generating RGB video output sig-
The individual Red, Green and Blue pixel input ports allow
True-Color, image rendition. True-Color image rendition, at
nals which are compatible with RS-343A and RS-170 video
standards, without requiring external buffering.
speeds of up to 220 MHz, is achieved through the use of the
Test diagnostic circuitry has been included to complement the
onboard data multiplexer/serializer. The pixel input ports flex-
users system level debugging.
ibility allows for direct interface to most standard frame buffer
memory configurations.
The ADV7152 is fabricated in a +5 V CMOS process. Its
monolithic CMOS construction ensures greater functionality
The 30 bits of resolution, associated with the color look-up
with low power dissipation.
OBSOLETE table and triple 10-bit DAC, realizes 24-bit True-Color resolu-
tion, while also allowing for the onboard implementation of lin-
earization algorithms, such as Gamma-Correction. This allows
effective 30-bit True-Color operation.
The on-chip video clock controller circuit generates all the in-
ternal clocking and some additional external clocking signals.
The ADV7152 is packaged in a plastic 100-pin power quad flat-
pack (QFP). Superior thermal dissipation is achieved by inclu-
sion of a copper heatslug, within the standard package outline
to which the die is attached.
CIRCUIT DETAILS AND OPERATION
OVERVIEW
Digital video or pixel data is latched into the ADV7152 over the
devices Pixel Port. This data acts as a pointer to the onboard
Color Palette RAM. The data at the RAM address pointed to is
latched into the digital-to-analog converters (DACs) and output
as an RGB analog video signal.
For the purposes of clarity of description, the ADV7152 is bro-
Pixel Port and Clock Control Circuit
The Pixel Port of the ADV7152 is directly interfaced to the
video/graphics pipeline of a computer graphics subsystem. It is
connected directly or through a gate array to the video RAM of
the systems Frame-Buffer (video memory). The pixel port on
the device consists of:
Color Data
Pixel Controls
RED, GREEN, BLUE
SYNC, BLANK
ken down into three separate functional blocks. These are:
Palette Selects
PS0–PS1
1. Pixel port and clock control circuit
The associated clocking signals for the pixel port include:
2. MPU port, registers and color palette
3. Digital-to-analog converters and video outputs
Clock Inputs
Clock Outputs
CLOCK, CLOCK,
LOADIN, SCKIN
LOADOUT, PRGCKOUT,
Table I shows the architectural and packaging differences be-
SCKOUT
tween other devices in the ADV715x series of workstation parts.
(For more details consult the relevant data sheets.)
These onboard clock control signals are included to simplify
interfacing between the part and the frame buffer. Only two
Table I. Architectural and Packaging Differences of the
ADV715x Series
control input signals are necessary to get the part operational,
CLOCK and CLOCK (ECL Levels). No additional signals or
external glue logic are required to get the Pixel Port & Clock
Description
ADV7150* ADV7152 ADV7151*
Control Circuit of the part operational.
24-Bit “Gamma” True Color
•
24-Bit “Standard” True Color •
8-Bit “Gamma” Pseudo Color •
8-Bit “Standard” Pseudo Color •
15-Bit True Color
•
220 MHz – True Color
•
220 MHz – Pseudo Color
•
•
•
•
•
•
•
•
•
•
•
Pixel Port (Color Data)
The ADV7152 has 48 color data inputs. The part has two (for
2:1 multiplexing) 24-bit wide direct color data inputs. These
are user programmed to support a number of color data for-
mats including 24-Bit True Color, 15-Bit True Color and
8-Bit Pseudo Color (see “Color Data Formats” section) in 2:1
and 1:1 multiplex modes.
Triple 10-Bit DACs
•
•
•
4:1 Multiplexing
•
•
2:1 Multiplexing
1:1 Multiplexing
•
•
•
•
•
•
RED 8
24
A
160-Lead QFP
100-Lead QFP
•
•
•
GREEN 8
BLUE 8
24
MULTIPLEXER
*See ADV7151 and ADV7150 data sheets for more information on these parts.
24
B
Figure 10. Multiplexed Color Inputs for the ADV7152
–10–
REV. B
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