AD4002 datasheet(37/39 Pages) AD

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Data Sheet

AD4002/AD4006/AD4010

Rev. A | Page 37 of 39

LAYOUT GUIDELINES

The PCB that houses the AD4002/AD4006/AD4010 must be

designed so that the analog and digital sections are physically

separated, such as on opposite sides of the device as shown in

Figure 65. The pinout of the AD4002/AD4006/AD4010, with

the analog signals on the left side and the digital signals on the

right side, helps to separate the analog and digital signals.

Avoid running digital lines under the device because they

couple noise onto the die, unless a ground plane under the

AD4002/AD4006/AD4010 is used as a shield. Fast switching

signals, such as CNV or clocks, must not run near analog signal

paths. Avoid crossover of digital and analog signals.

At least one ground plane must be used. The ground plane can

be common or split between the digital and analog sections. In

the latter case, join the planes underneath the AD4002/AD4006/

AD4010 devices.

The AD4002/AD4006/AD4010 voltage reference input (REF)

has a dynamic input impedance. Decouple the REF pin with

minimal parasitic inductances by placing the reference decoupling

ceramic capacitor close to (ideally right up against) the REF and

GND pins and connect them with wide, low impedance traces.

Finally, decouple the VDD and VIO power supplies of the

AD4002/AD4006/AD4010 with ceramic capacitors, typically

0.1 μF, placed close to the AD4002/AD4006/AD4010 and

connected using short, wide traces to provide low impedance

paths and to reduce the effect of glitches on the power supply

lines.

An example of the AD4002 layout following these rules is

shown in Figure 65 and Figure 66. Note that the AD4006/

AD4010 layout is equivalent to the AD4002 layout.

EVALUATING THE AD4002/AD4006/AD4010

PERFORMANCE

Other recommended layouts for the AD4002/AD4006/AD4010

are outlined in the user guide of the evaluation board for the

AD4002 (EVAL-AD4002FMCZ). The evaluation board package

includes a fully assembled and tested evaluation board with the

AD4002, the UG-1042 user guide, and software for controlling

the board from a PC via the EVAL-SDP-CH1Z. The EVAL-

AD4002FMCZ can also be used to evaluate the AD4006 and

AD4010 by limiting the throughput to 1 MSPS and 500 kSPS,

respectively, in its software (see UG-1042).

Figure 65. Example Layout of the AD4002 (Top Layer)

Figure 66. Example Layout of the AD4002 (Bottom Layer)

AD4002 Datasheet(PDF) 37 Page - Analog Devices

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