AD9515SLASHPCBZ datasheet(24/28 Pages) AD

24 / 28 page

AD9515

Data Sheet

Rev. B | Page 24 of 28

Exposed Metal Paddle

The exposed metal paddle on the AD9515 package is an

electrical connection, as well as a thermal enhancement. For

the device to function properly, the paddle must be properly

attached to ground (GND).

The exposed paddle of the AD9515 package must be soldered

down.

The AD9515 must dissipate heat through its exposed

paddle. The PCB acts as a heat sink for the AD9515. The PCB

attachment must provide a good thermal path to a larger heat

dissipation area, such as a ground plane on the PCB. This

requires a grid of vias from the top layer down to the ground

plane (see Figure 33). The AD9515 evaluation board

(AD9515/PCB)provides a good example of how the part

should be attached to the PCB.

VIAS TO GND PLANE

Figure 33. PCB Land for Attaching Exposed Paddle

POWER MANAGEMENT

In some cases, the AD9515 can be configured to use less power

by turning off functions that are not being used.

The power-saving options include the following:



A divider is powered down when set to divide = 1

(bypassed).



Adjustable delay block on OUT1 is powered down when in

off mode (S0 = 0).



An unneeded output can be powered down (see Table 12

and Table 13). This also powers down the divider for that

output.

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