AD8132ARZ-R7 datasheet(24/32 Pages) AD

24 / 32 page

AD8132

Rev. F | Page 24 of 32

LAYOUT, GROUNDING, AND BYPASSING

As a high speed part, the AD8132 is sensitive to the PCB envi-

ronment 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 fre-

quency 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 differ-

ential 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

Figure 67. Typical Four-Resistor Feedback Circuit

RF2

RG2

VIN

Figure 68. Typical Circuit with β1 = 0

RF1

RG1

Figure 69. Typical Circuit with β2 = 1

VIN

Figure 70. G = 2 Circuit with β1 = 0, Without Resistors

RF1

RG1

VIN

Figure 71. Typical Circuit with β2 = 0

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