MUX36S08 Datasheet, PDF (29/37 Pages) Texas Instruments – Low-Capacitance, Low-Leakage-Current, Precision, Analog Multiplexers

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12 Layout
MUX36S08, MUX36D04
SBOS705A – JANUARY 2016 – REVISED JANUARY 2015
12.1 Layout Guidelines
Figure 45 illustrates an example of a PCB layout with the MUX36S08IPW, and Figure 46 illustrates an example
of a PCB layout with MUX36D04IPW.
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. In case of the differential signal, ensure 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
MUX36S 08IPW
A1
A2
GND
V_DD
S5
S6
S7
S8
Via to
ground plane
C
Figure 45. MUX36S08IPW Layout Example
Via to
ground plane
C
AO
EN
VSS
S 1A
S 2A
S 3A
S 4A
DA
MUX36D04IPW
A1
GND
V_DD
S 1B
S 2B
S 3B
S 4B
DB
Via to
ground plane
C
Figure 46. MUX36D04IPW Layout Example
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