參數(shù)資料
型號(hào)： AL128
廠(chǎng)商： Electronic Theatre Controls, Inc.
元件分類(lèi)： 圓形連接器
英文描述： Circular Connector; No. of Contacts:55; Series:MS27497; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:22; Circular Contact Gender:Socket; Circular Shell Style:Wall Mount Receptacle RoHS Compliant: No
中文描述： 即插即用VGA到的NTSC / PAL制式轉(zhuǎn)換器
文件頁(yè)數(shù)： 40/45頁(yè)
文件大小： 498K
代理商： AL128
AL128
April 2, 1999
40
9.0 Board Design and Layout Considerations
The AL128 is a highly integrated mixed-signal IC. It contains both precision analog and high speed
digital circuitry. Special care needs to be taken in order to maintain the best video quality. Noise
coupling from digital circuits to analog circuits may result in poor video quality. Therefore, the layout
should be optimized for lowest noise on the power and ground planes by shielding the digital circuitry
and providing good decoupling.
It is recommended to place the AL128 chip close to the graphic and video input/output connectors.
9.1 Grounding
Analog and digital circuits are separated within the AL128 chip. To minimize system noise and prevent
digital system noise from entering the analog portion, a common ground plane for all devices,
including the AL128, is recommended. All the connections to the ground plane should have very short
lead. The ground plane should be solid, not cross-hatched.
9.2 Power Planes
The analog portion of the AL128 and any associated analog circuitry should have their own power
plane, referred to as the analog power plane (AVDD). The analog power plane should be connected to
the digital power plane (DVDD) at a single point through a low resistance ferrite bead. The D/A
conversion circuitry within the AL128 uses the DVDD power.
The digital power plane should provide power to all digital logic on the PC board, and the analog
power plane should provide power to all of the AL128 analog power pins and relevant analog
circuitry.
The digital power plane should not be placed under the AL128 chip, the voltage references or other
analog circuitry. Capacitive coupling of digital power supply noise from this layer to the AL128 and its
related analog circuitry can degrade video output quality.
9.3 Power Supply Decoupling
Power supply connection pins should be individually decoupled. For best results, use 0.1
μ
F ceramic
chip capacitors. Lead lengths should be minimized. The power pins should be connected to the bypass
capacitors before being connected to the power planes. 22
μ
F capacitors should also be used between
the AL128 power planes and the ground planes to control low-frequency power ripple.
9.4 Digital Signal and Clock Interconnect
Digital signals to the AL128 should be isolated as much as possible from the analog outputs and other
analog circuitry. Also, these signals should not overlap the analog power plane. If this is not possible,
coupling can be minimized by routing the digital signal at a 90 degree angle across the analog signals.
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