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ADV453 датащи(PDF) 9 Page - Analog Devices

номер детали ADV453
подробное описание детали  CMOS 66 MHz Monolithic 2563 24 Color Palette RAM-DAC
Download  12 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

ADV453 датащи(HTML) 9 Page - Analog Devices

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ADV453
REV. B
–9–
Figure 5. RGB Video Output Waveform
Table V. Video Output Truth Table
IOR, IOB,
DAC
Description
IOG mA1
mA
SYNC
BLANK
Input Data
White Level
26.67
19.05
1
1
FFH
Video
Video + 9.05
Video + 1.44
1
1
Data
Video to Blank
Video + 1.44
Video + 1.44
0
1
Data
Black Level
9.05
1.44
1
1
00H
Black to Blank
1.44
1.44
0
1
00H
Blank Level
7.62
0
1
0
XXH
SYNC Level
0
0
0
0
XXH
NOTE
1Typical with full Scale IOG = 26.67 mA. V
REF = 1.235 V, RSET = 280
Ω, I
SYNC connected to IOG.
PC BOARD LAYOUT CONSIDERATIONS
The ADV453 is optimally designed for lowest noise perform-
ance, both radiated and conducted noise. To complement the
excellent noise performance of the ADV453, it is imperative that
great care be given to the PC board layout. The layout should
be optimized for lowest noise on the ADV453 power and
ground lines. This can be achieved by shielding the digital in-
puts and providing good decoupling. The lead length between
groups of VAA and GND pins should by minimized so as to
minimize inductive ringing.
Ground Planes
The ground plane should encompass all ADV453 ground pins,
voltage reference circuitry, power supply bypass circuitry, the
analog output traces and all the digital signal traces leading up
to the ADV453.
Power Planes
The PC board layout should have two distinct power planes,
one for analog circuitry and one for digital circuitry. The analog
power plane should encompass the ADV453 (VAA) and all asso-
ciated analog circuitry. This power plane should be connected
to the regular PCB power plane (VCC) at a single point through
a ferrite bead, as illustrated in Figure 6. This bead should be lo-
cated within three inches of the ADV453.
The PCB power plane should provide power to all digital logic
on the PC board, and the analog power plane should provide
power to all ADV453 power pins, voltage reference circuitry and
any output amplifiers.
The PCB power and ground planes should not overlay portions
of the analog power plane. Keeping the PCB power and ground
planes from overlaying the analog power plane will contribute to
a reduction in plane-to-plane noise coupling.


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