AD9513SLASHPCB datasheet(22/28 Pages) AD

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AD9513

Rev. 0 | Page 22 of 28

POWER SUPPLY

The AD9513 requires a 3.3 V ± 5% power supply for VS. The

tables in the Specifications section give the performance

expected from the AD9513 with the power supply voltage

within this range. In no case should the absolute maximum

range of −0.3 V to +3.6 V, with respect to GND, be exceeded

on Pin VS.

Good engineering practice should be followed in the layout of

power supply traces and the ground plane of the PCB. The

power supply should be bypassed on the PCB with adequate

capacitance (>10 μF). The AD9513 should be bypassed with

adequate capacitors (0.1 μF) at all power pins as close as

possible to the part. The layout of the AD9513 evaluation

board (AD9513/PCB) is a good example.

Exposed Metal Paddle

The exposed metal paddle on the AD9513 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 AD9513 package must be soldered

down.

The AD9513 must dissipate heat through its exposed

paddle. The PCB acts as a heat sink for the AD9513. 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 28).The AD9513 evaluation board

(AD9513/PCB)provides a good example of how the part

should be attached to the PCB.

VIAS TO GND PLANE

Figure 28. PCB Land for Attaching Exposed Paddle

POWER MANAGEMENT

In some cases, the AD9513 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 OUT2 is powered down when in

off mode (S0 = 0).

•

An unneeded output can be powered down (see Table 12).

This also powers down the divider for that output.

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