參數(shù)資料
型號： ADV7192
廠商： Analog Devices, Inc.
英文描述： Video Encoder with Six 10-Bit DACs, 54 MHz Oversampling and Progressive Scan Inputs
中文描述： 視頻編碼器與六10位DAC，54兆赫采樣和逐行掃描輸入
文件頁數(shù)： 45/69頁
文件大?。?/td> 664K
代理商： ADV7192
ADV7192
–45–
REV. 0
APPENDIX 1
BOARD DESIGN AND LAYOUT CONSIDERATIONS
The ADV7192 is a highly integrated circuit containing both
precision analog and high-speed digital circuitry. It has been
designed to minimize interference effects on the integrity of the
analog circuitry by the high-speed digital circuitry. It is imperative
that these same design and layout techniques be applied to the
system level design such that high-speed, accurate performance
is achieved. The Recommended Analog Circuit Layout shows the
analog interface between the device and monitor.
The layout should be optimized for lowest noise on the ADV7192
power and ground lines by shielding the digital inputs and pro-
viding good decoupling. The lead length between groups of V
AA
and GND pins should by minimized so as to minimize inductive
ringing.
Ground Planes
The ground plane should encompass all ADV7192 ground pins,
voltage reference circuitry, power supply bypass circuitry for
the ADV7192, the analog output traces, and all the digital signal
traces leading up to the ADV7192. This should be as substantial as
possible to maximize heat spreading and power dissipation on the
board.
Power Planes
The ADV7192 and any associated analog circuitry should have its
own power plane, referred to as the analog power plane (V
AA
). This
power plane should be connected to the regular PCB power plane
(V
CC
) at a single point through a ferrite bead. This bead should
be located within three inches of the ADV7192.
The metallization gap separating device power plane and board
power plane should be as narrow as possible to minimize the
obstruction to the flow of heat from the device into the general
board.
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 ADV7192 power pins and voltage reference circuitry.
Plane-to-plane noise coupling can be reduced by ensuring that
portions of the regular PCB power and ground planes do not
overlay portions of the analog power plane, unless they can be
arranged such that the plane-to-plane noise is common-mode.
Supply Decoupling
For optimum performance, bypass capacitors should be installed
using the shortest leads possible, consistent with reliable operation,
to reduce the lead inductance. Best performance is obtained
with 0.1
μ
F ceramic capacitor decoupling. Each group of V
AA
pins on the ADV7192 must have at least one 0.1
μ
F decoupling
capacitor to GND. These capacitors should be placed as close as
possible to the device.
It is important to note that while the ADV7192 contains circuitry
to reject power supply noise, this rejection decreases with fre-
quency. If a high frequency switching power supply is used, the
designer should pay close attention to reducing power supply
noise and consider using a three-terminal voltage regulator for
supplying power to the analog power plane.
Digital Signal Interconnect
The digital inputs to the ADV7192 should be isolated as much as
possible from the analog outputs and other analog circuitry. Also,
these input signals should not overlay the analog power plane.
Due to the high clock rates involved, long clock lines to the
ADV7192 should be avoided to reduce noise pickup.
Any active termination resistors for the digital inputs should be
connected to the regular PCB power plane (V
CC
), and not the
analog power plane.
Analog Signal Interconnect
The ADV7192 should be located as close as possible to the output
connectors to minimize noise pickup and reflections due to
impedance mismatch.
The video output signals should overlay the ground plane, and
not the analog power plane, to maximize the high frequency power
supply rejection.
Digital inputs, especially pixel data inputs and clocking signals
should never overlay any of the analog signal circuitry and should
be kept as far away as possible.
For best performance, the outputs should each have a 300
load
resistor connected to GND. These resistors should be placed as
close as possible to the ADV7192 so as to minimize reflections.
The ADV7192 should have no inputs left floating. Any inputs
that are not required should be tied to ground.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADV7192KST 制造商:AD 制造商全稱:Analog Devices 功能描述:Video Encoder with Six 10-Bit DACs, 54 MHz Oversampling and Progressive Scan Inputs
ADV7194 制造商:AD 制造商全稱:Analog Devices 功能描述:Professional Extended-10⑩ Video Encoder with 54 MHz Oversampling
ADV7194KST 制造商:Analog Devices 功能描述:Video Encoder 6DAC 10-Bit 80-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:PROFESSIONAL/HDTV NTSC/PAL ENCODER I.C. - Bulk 制造商:Analog Devices 功能描述:IC VIDEO ENCODER
ADV7194KSTZ 功能描述:IC ENCODER VIDEO EXT-10 80-LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標(biāo)準(zhǔn)包裝:1 系列:- 類型:編碼器 應(yīng)用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應(yīng)商設(shè)備封裝:模塊 包裝:散裝 其它名稱:Q4645799
ADV7194KSTZ 制造商:Analog Devices 功能描述:TV / Video IC
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