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参数资料
| 型号： | 5962F0153702VXX |
| 元件分类： | 多路复用及模拟开关 |
| 英文描述： | QUAD 2-CHANNEL, CROSS POINT SWITCH, DFP64 |
| 封装： | DFP-64 |
| 文件页数： | 9/14页 |
| 文件大小： | 81K |
| 代理商： | 5962F0153702VXX |
4
APPLICATIONS INFORMATION
The UT54LVDM228 provides three modes of operation. In
the 1:2 splitter mode, the two outputs are copies of the same
single input. This is useful for distribution / fan-out
applications. In the repeater mode, the device operates as a
9channel LVDS buffer. Repeating the signal restores the
LVDS amplitude, allowing it to drive another media segment.
This allows for isolation of segments or long distance
applications or buffers standard LVDS to 10mA multi-op
drivers.The switch mode provides a crosspoint function. This
can be used in a system when primary and redundant paths
are supported in a fault tolerant application.
The intended application of these devices and signaling
technique is for both point-to-point baseband (single
termination) and multipoint (double termination) data
transmissions over controlled impedance media. The
transmission media may be printed-circuit board traces,
backplanes, or cables. (Note: The ultimate rate and distance
of data transfer is dependent upon the attenuation
characteristics of the media, the noise coupling to the
environment, and other application specific
characteristics.
Input Fail-Safe:
The UT54LVDM228 also supports OPEN, shorted and
terminated input fail-safe. Receiver output will be HIGH for
all fail-safe conditions.
PCB layout and Power System Bypass:
Circuit board layout and stack-up for the UT54LVDM228
should be designed to provide noise-free power to the device.
Good layout practice also will separate high frequency or high
level inputs and outputs to minimize unwanted stray noise
pickup, feedback and interference. Power system
performance may be greatly improved by using thin
dielectrics (4 to 10 mils) for power/ground sandwiches. This
increases the intrinsic capacitance of the PCB power system
which improves power supply filtering, especially at high
frequencies, and makes the value and placement of external
bypass capacitors less critical. External bypass capacitors
should include both RF ceramic and tantalum electrolytic
types. RF capacitors may use values in the range 0.01
F to
0.1
F. Tantalum capacitors may be in the range of 2.2F to
10
F. Voltage rating for tantalum capacitors should be at
least 5X the power supply voltage being used. It is
recommended practice to use two vias at each power pin of
the UT54LVDM228, as well as all RF bypass capacitor
terminals. Dual vias reduce the interconnect inductance and
extends the effective frequency range of the bypass
components.
The outer layers of the PCB may be flooded with additional
ground plane. These planes will improve shielding and
isolation, as well as increase the intrinsic capacitance of the
power supply plane system. Naturally, to be effective, these
planes must be tied to the ground supply plane at frequent
intervals with vias. Frequent via placement also improves
signal integrity in signal transmission lines by providing short
paths for image currents which reduces signal distortion. The
planes should be pulled back from all transmission lines and
component mounting pads a distance equal to the width of
the widest transmission line from the internal power or
ground plane(s) whichever is greater. Doing so minimizes
effects on transmission line impedances and reduces
unwanted parasitic capacitances at component mounting
pads.
Compatibility with LVDS standard:
In backplane multidrop configurations, with closely spaced
loads, the effective differential impedance of the line is
reduced. If the mainline has been designed for 50
differential impedance, the loading effects may reduce this
to the 35
range depending upon spacing and capacitance
load. Terminating the line with a 35
load is a better match
than with 50
and reflections are reduced.
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| 5962F0254601VPA | 功能描述:运算放大器 - 运放 RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
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