DB

AO

EN

S 1A

S 2A

S 3A

DA

A1

GND

S 1B

S 2B

S 3B

S 4B

S 4A

Via to

ground plane

Via to

ground plane

MUX509 IPW

C

C

AO

EN

S 1

S 2

S 3

D

A1

A 2

GND

S 5

S 6

S 7

S 8

S 4

Via to

ground plane

Via to

ground plane

MUX508IPW

C

C

29

MUX508, MUX509

www.ti.com

SBAS758A – JANUARY 2016 – REVISED MARCH 2016

Product Folder Links: MUX508 MUX509

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Copyright © 2016, Texas Instruments Incorporated

12 Layout

12.1 Layout Guidelines

Figure 45 illustrates an example of a PCB layout with the MUX508IPW, and Figure 46 illustrates an example of a

PCB layout with MUX509IPW.

Some key considerations are:

1. Decouple the VDD and VSS pins with a 0.1-µF capacitor, placed as close to the pin as possible. Make sure

2. Keep the input lines as small as possible. For the MUX509 differential signals, make sure the A inputs and B

inputs are as symmetric as possible.

3. Use a solid ground plane to help distribute heat and reduce electromagnetic interference (EMI) noise pickup.

4. Do not run sensitive analog traces in parallel with digital traces. Avoid crossing digital and analog traces if

possible and only make perpendicular crossings when necessary.

12.2 Layout Example

Figure 45. MUX508IPW Layout Example

Figure 46. MUX509IPW Layout Example