AD8197B データシートの表示（PDF） - Analog Devices

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AD8197B

4:1 HDMI/DVI Switch with Equalization

Analog Devices 

Power Supply Bypassing

The AD8197B 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.

RECOMMENDED

AD8197B

In applications where the AD8197B 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, one 1000 pF, two 0.01 μF, and one 4.7 μF

capacitors. The capacitors should via down directly to the

supply planes and be placed within a few centimeters of the

AD8197B. The AMUXVCC supply does not require additional

bypassing. This bypassing scheme is illustrated in Figure 35.

EXTRA ADDED INDUCTANCE

NOT RECOMMENDED

Figure 34. Recommended Pad Outline for Bypass Capacitors

AD8197B

Figure 35. Example Placement of Power Supply Decoupling Capacitors

Around the AD8197B

Rev. 0 | Page 27 of 28

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