AD8197A Analog Devices, AD8197A Datasheet - Page 27

• Manufacturer Part Number: AD8197A
• Description: 4:1 HDMI/DVI Switch with Equalization
• Manufacturer: Analog Devices

Power Supply Bypassing
The AD8197A requires minimal supply bypassing. When
powering the supplies individually, place a 0.01 μF capacitor
between each 3.3 V supply pin (AVCC, DVCC, VTTI, and VTTO)
and ground to filter out supply noise. Generally, bypass capacitors
should be placed near the power pins and should connect directly
to the relevant supplies (without long intervening traces). For
example, to improve the parasitic inductance of the power supply
decoupling capacitors, minimize the trace length between
capacitor landing pads and the vias, as shown in Figure 34.
In applications where the AD8197A is powered by a single 3.3 V
supply, it is recommended to use two reference supply planes
and bypass the 3.3 V reference plane to the ground reference
plane with one 220 pF capacitor, one 1000 pF capacitor, two
Figure 34. Recommended Pad Outline for Bypass Capacitors
RECOMMENDED
NOT RECOMMENDED
EXTRA ADDED INDUCTANCE
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0.01 μF capacitors, and one 4.7 μF capacitor. The capacitors
should via down directly to the supply planes and be placed
within a few centimeters of the AD8197A. The AMUXVCC
supply does not require additional bypassing. This bypassing
scheme is illustrated in Figure 35.
Figure 35. Example Placement of Power Supply Decoupling Capacitors
AUXILIARY LINES
TMDS TRACES
Around the AD8197A
AD8197A
DECOUPLING
CAPACITORS
AD8197A