MUX508 Datasheet, PDF (29/37 Pages) Texas Instruments – Low-Capacitance, Low-Charge-Injection, Precision, Analog Multiplexers

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12 Layout
MUX508, MUX509
SBAS758A – JANUARY 2016 – REVISED MARCH 2016
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
that the capacitor voltage rating is sufficient for the V_DD and V_SS supplies.
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
Via to
ground plane
C
AO
EN
V_SS
S1
S2
S3
S4
D
MUX508IPW
A1
A2
GND
V_DD
S5
S6
S7
S8
Via to
ground plane
C
Figure 45. MUX508IPW Layout Example
Via to
ground plane
C
AO
EN
VSS
S 1A
S 2A
S 3A
S 4A
DA
MUX509 IPW
A1
GND
V_DD
S 1B
S 2B
S 3B
S 4B
DB
Via to
ground plane
C
Figure 46. MUX509IPW Layout Example
Copyright © 2016, Texas Instruments Incorporated
Product Folder Links: MUX508 MUX509
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