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參數(shù)資料
| 型號(hào)： | MAX458 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類(lèi)： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 8x4 Video Crosspoint Switches with Buffers(8*4,100MHz,具緩沖器,交叉視頻開(kāi)關(guān)矩陣) |
| 中文描述： | 8-CHANNEL, CROSS POINT SWITCH |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大?。?/td> | 185K |
| 代理商： | MAX458 |
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8x4 Video Crosspoint S witc hes with Buffers
______________________________________________________________________________________
13
__________Applic ations Information
Grounding and Bypassing,
PC Board Layout
As with all analog circuits, good PC board layout, prop-
er grounding, and careful component selection are cru-
cial for realizing the full AC performance of high-speed
amplifiers such as the MAX458/MAX459. For optimal
performance:
1) Use a large, low-impedance analog ground plane.
With multilayer boards, the ground plane(s) should
be located on the layer that does not contain signal
traces. Connect all GND pins to the analog ground
plane.
2) Minimize trace area at the circuit’s critical high-imped-
ance nodes to prevent unwanted signal coupling.
Surround analog inputs with an AC ground trace
(bypassed DC power supply, etc.). The analog input
pins of the MAX458/MAX459 have been separated
with AC ground pins (GND, V
CC
, V
EE
) to minimize
parasitic coupling, which can degrade crosstalk.
3) Connect the coaxial-cable shield to the ground side
of the 75
terminating resistor at the ground plane
to further reduce crosstalk (Figure 11).
4) Bypass all power-supply pins directly to the ground
plane with 0.1μF ceramic capacitors placed as
close to the supply pins as possible. For high-cur-
rent loads, you may need 10μF tantalum or alu-
minum-electrolytic capacitors in parallel with the
0.1μF ceramics. Keep capacitor lead lengths as
short as possible to minimize series inductance; sur-
face-mount chip capacitors are ideal.
Creating Larger Arrays
The MAX458/MAX459 assume a high-impedance state
on power-up if the inputs are not being programmed to
any particular state during that time. They also are in a
high-impedance state when disabled. This feature
makes it possible to create larger arrays than 8x4 with-
out special programming, other than ensuring that your
program doesn’t turn on two paralleled outputs simulta-
neously. Testing has shown no degradation of differen-
tial gain or phase when the outputs are connected in
parallel.
The MAX458/MAX459’s input registers remain active dur-
ing shutdown, which allows the crosspoint to be pro-
grammed while the devices are shut down. As a result, all
outputs may be simultaneously brought to any state,
including disabled. J ust program all of the MAX458/
MAX459s into shutdown, and enter the program of your
choice by selecting the desired inputs and outputs. Taking
SHDN low takes the device(s) out of shutdown.
A power-on reset circuit causes the output amplifiers to
power up in the disabled mode, whether or not SHDN
The number of MAX458s that can be paralleled is limit-
ed by capacitive loading on each output, which must
not exceed 100pF. Each input presents approximately
7pF of load, and each output presents approximately
12pF. Therefore, the MAX458/MAX459 will drive a maxi-
mum of 14 inputs, or 7 outputs and 2 inputs, or any
other combination resulting in less than a 100pF load.
Adding isolation resistors enables more MAX458s to be
paralleled (see the Driving Capacitive Loads section).
MAX458
MAX459
CS
SCLK
DIN
DOUT
SCK
MOSI
I/O
MOSO
THE DOUT-MOSOCONNECTION IS NOT REQUIRED FOR
WRITING TOTHE MAX458/MAX459, BUT MAY BE USED
FOR DATA-ECHOPURPOSES.
CPOL = 0, CPHA = 0
SPI/QSPI
PORT
Figure 10. SPI/QSPI Connection
RETURN
CURRENT
IN_
IN_
RETURN
CURRENT
G
Figure 11. Low-Crosstalk Layout. Return current from termina-
tion resistor does not flow through the ground plane.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX459 | 8x4 Video Crosspoint Switches with Buffers(8*4,90MHz,帶AV=2V/V輸出緩沖器,交叉視頻開(kāi)關(guān)矩陣) |
| MAX4610ASD | Low-Voltage, Quad, SPST CMOS Analog Switches |
| MAX4611ASD | Low-Voltage, Quad, SPST CMOS Analog Switches |
| MAX4611AUD | Low-Voltage, Quad, SPST CMOS Analog Switches |
| MAX4612ASD | Low-Voltage, Quad, SPST CMOS Analog Switches |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4580CAE | 功能描述:模擬開(kāi)關(guān) IC RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:2 開(kāi)關(guān)配置:SPDT 開(kāi)啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-16 |
| MAX4580CAE+ | 功能描述:模擬開(kāi)關(guān) IC 1.25Ohm Dual SPST Analog Switch RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:2 開(kāi)關(guān)配置:SPDT 開(kāi)啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-16 |
| MAX4580CAE+T | 功能描述:模擬開(kāi)關(guān) IC 1.25Ohm Dual SPST Analog Switch RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:2 開(kāi)關(guān)配置:SPDT 開(kāi)啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-16 |
| MAX4580CAE-T | 功能描述:模擬開(kāi)關(guān) IC RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:2 開(kāi)關(guān)配置:SPDT 開(kāi)啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-16 |
| MAX4580CPE | 功能描述:模擬開(kāi)關(guān) IC RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:2 開(kāi)關(guān)配置:SPDT 開(kāi)啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-16 |
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