參數(shù)資料
型號(hào)： MAX4356
廠(chǎng)商： Maxim Integrated Products, Inc.
英文描述： 16x16 Nonblocking Video Crosspoint Switch with On-Screen Display Insertion and I/O Buffers
中文描述： 16 x 16、無(wú)阻塞視頻交叉點(diǎn)開(kāi)關(guān)，帶有屏幕顯示插入及輸入/輸出緩沖器
文件頁(yè)數(shù)： 37/41頁(yè)
文件大?。?/td> 853K
代理商： MAX4356
M
16 x 16 Nonbloc king Video Crosspoint S witc h
with On-S c reen Display Insertion and I/O Buffers
______________________________________________________________________________________
37
This technique for inserting OSD display information is
an improvement over the way it has traditionally been
done. Other OSD techniques require an external fast
mux and a buffer for each output.
Crosstalk S ignal and Board Routing Issues
Improper signal routing causes performance problems
such as crosstalk. The MAX4356 has a typical crosstalk
rejection of -62dB at 6MHz. A bad PC board layout
degrades the crosstalk rejection by 20dB or more. To
achieve the best crosstalk performance:
1)
Place ground isolation between long critical sig-
nal PC board trace runs.
These traces act as a
shield to potential interfering signals. Crosstalk can
be degraded by parallel traces as well as directly
above and below on adjoining PC board layers.
2)
Maintain controlled-impedance traces.
Design as
many of the PC board traces as possible to be 75
transmission lines. This lowers the impedance of the
traces, reducing a potential source of crosstalk.
More power will be dissipated due to the output
buffer driving a lower impedance.
3)
Minimize ground-current interaction by using a
good ground plane strategy.
In addition to crosstalk, another key issue of concern is
isolation. Isolation is the rejection of undesirable feed-
through from input to output with the output disabled.
The MAX4356 acheives a -110dB isolation at 6MHz by
selecting the pinout configuration such that the inputs
and outputs are on opposite sides of the package.
Coupling through the power supply is a function of the
quality and location of the supply bypassing. Use
appropriate low-impedance components and locate
them as close as possible to the IC. Avoid routing the
inputs near the outputs.
Power-S upply Bypassing
The MAX4356 operates from a single +5V or dual ±3V
to ±5V supplies. For single-supply operation, connect
all V
EE
pins to ground and bypass all power-supply
pins with a 0.1μF capacitor to ground. For dual-supply
systems, bypass all supply pins to ground with 0.1μF
capacitors.
Power in Large S ystems
The MAX4356 has been designed to operate with split
supplies down to ±3V or a single supply of +5V.
Operating at the minimum supply voltages reduces the
power dissipation by as much 40% to 50%. At ±5V, the
MAX4356 consumes 195mW (0.76mW/point).
Driving a PC Board Interc onnec t or a
Cable (A
V
= +1V /V or +2V /V )
The MAX4356 output buffers can be programmed to
either A
V
= +1V/V or +2V/V. The +1V/V configuration is
typically used when driving a short-length (less than
3cm), high-impedance "local" PC board trace. To drive
a cable or a 75
transmission line trace program the
gain of the output buffer to +2V/V and place a 75
resistor in series with the output. The series termination
resistor and the 75
load impedance act as a voltage-
divider that divides the video signal in half. Set the gain
to +2V/V to transmit a standard 1V video signal down a
MONITOR 0
MONITOR 1
OSD
OUT0
SYNC0
SYNC1
SYNC0
OSDFILL0
OSDKEY0
OSDFILL1
OSDKEY1
OSDFILL15
OSDKEY15
SYNC1
SYNC15
SYNC15
OUT1
OUT15
IN0
CAMERAS
COMPUTER CONTROL
IN1
IN15
MONITOR 15
MAX4356
OSD
OSD
MEMORY
Figure 9. Improved Implementation of On-Screen Display
0
10
5
20
15
25
30
0
500
OPTIMAL ISOLATION RESISTANCE
vs. CAPACITIVE LOAD
CAPACITIVE LOAD (pF)
I
)
200
100
300
400
Figure 8. Optimal Isolation Resistor vs. Capacitive Load
相關(guān)PDF資料
PDF描述
MAX4358ECE 32 x 16 Nonblocking Video Crosspoint Switch with On-Screen Display Insertion and I/O Buffers
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參數(shù)描述
MAX4356ECD 功能描述:模擬和數(shù)字交叉點(diǎn) IC RoHS:否 制造商:Micrel 配置:2 x 2 封裝 / 箱體:MLF-16 數(shù)據(jù)速率:10.7 Gbps 輸入電平:CML, LVDS, LVPECL 輸出電平:CML 電源電壓-最大:3.6 V 電源電壓-最小:2.375 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 產(chǎn)品:Digital Crosspoint 封裝:Tube
MAX4356ECD+ 功能描述:視頻開(kāi)關(guān) IC 16x16 Nonblocking Video Crx Switch RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:4 開(kāi)啟電阻（最大值）:12 Ohms 傳播延遲時(shí)間: 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel
MAX4356ECD+T 功能描述:視頻開(kāi)關(guān) IC 16x16 Nonblocking Video Crx Switch RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:4 開(kāi)啟電阻（最大值）:12 Ohms 傳播延遲時(shí)間: 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel
MAX4356ECD-T 功能描述:模擬和數(shù)字交叉點(diǎn) IC RoHS:否 制造商:Micrel 配置:2 x 2 封裝 / 箱體:MLF-16 數(shù)據(jù)速率:10.7 Gbps 輸入電平:CML, LVDS, LVPECL 輸出電平:CML 電源電壓-最大:3.6 V 電源電壓-最小:2.375 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 產(chǎn)品:Digital Crosspoint 封裝:Tube
MAX4357ECD 功能描述:模擬和數(shù)字交叉點(diǎn) IC Integrated Circuits (ICs) RoHS:否 制造商:Micrel 配置:2 x 2 封裝 / 箱體:MLF-16 數(shù)據(jù)速率:10.7 Gbps 輸入電平:CML, LVDS, LVPECL 輸出電平:CML 電源電壓-最大:3.6 V 電源電壓-最小:2.375 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 產(chǎn)品:Digital Crosspoint 封裝:Tube
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