AD9514SLASHPCB datasheet(24/28 Pages) AD

24 / 28 page

AD9514

Rev. 0 | Page 24 of 28

Exposed Metal Paddle

The exposed metal paddle on the AD9514 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 AD9514 package must be soldered

down.

The AD9514 must dissipate heat through its exposed

paddle. The PCB acts as a heat sink for the AD9514. 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 34). The AD9514 evaluation board

(AD9514/PCB) provides a good example of how the part

should be attached to the PCB.

VIAS TO GND PLANE

Figure 34. PCB Land for Attaching Exposed Paddle

POWER MANAGEMENT

In some cases the AD9514 can be configured to use less power

by turning off functions that are not being used.

The power-saving options include the following:

•

Any divider is powered down when set to divide = 1

(bypassed).

•

Adjustable delay block on OUT2 is powered down when in

off mode (S0 = 0).

•

In some cases, an unneeded output can be powered down

(see Table 11). This also powers down the divider for that

output.

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