參數(shù)資料
型號： AD8132AR-EBZ
廠商： Analog Devices Inc
文件頁數(shù)： 19/33頁
文件大?。?/td> 0K
描述： BOARD EVAL FOR AD8132AR
標(biāo)準(zhǔn)包裝： 1
每 IC 通道數(shù)： 1 - 單
放大器類型： 差分
板類型： 裸（未填充）
已供物品： 板
已用 IC / 零件： 8-SOIC 封裝
AD8132
Rev. I | Page 25 of 32
LAYOUT, GROUNDING, AND BYPASSING
As a high speed part, the AD8132 is sensitive to the printed
circuit board (PCB) environment in which it operates. Realizing
its superior specifications requires attention to various details of
good high speed PCB design.
The first requirement is a good solid ground plane that covers as
much of the board area around the AD8132 as possible. The only
exception to this is that the two input pins (Pin 1 and Pin 8) are
kept a few millimeters from the ground plane and that ground
be removed from inner layers and the opposite side of the board
under the input pins. This minimizes the stray capacitance on
these nodes and helps preserve the gain flatness vs. the frequency.
Bypass the power supply pins as close as possible to the device
to the nearby ground plane and use good high frequency ceramic
chip capacitors. Do this bypassing with a capacitance value
of 0.01 μF to 0.1 μF for each supply. Farther away, provide low
frequency bypassing with 10 μF tantalum capacitors from each
supply to ground.
Keep the signal routing short and direct to avoid parasitic effects.
Wherever there are complementary signals, a symmetrical
layout with matched lengths must be provided to the extent
possible to maximize the balance performance. When running
differential signals over a long distance, place the traces on
the PCB close together or twist together any differential wiring
to minimize the area of the loop that is formed. This reduces
the radiated energy and makes the circuit less susceptible to
interference.
CIRCUITS
RF1
+
RF2
RG1
RG2
01
03
5-
0
65
Figure 67. Typical Four-Resistor Feedback Circuit
+
RF2
RG2
VIN
01
03
5-
06
6
Figure 68. Typical Circuit with β1 = 0
RF1
+
RG1
01
03
5-
06
7
Figure 69. Typical Circuit with β2 = 1
+
VIN
01
03
5-
06
8
Figure 70. G = +2 Circuit with β1 = 0, Without Resistors
RF1
+
RG1
VIN
01
03
5-
06
9
Figure 71. Typical Circuit with β2 = 0
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