TS5A3166_15 Datasheet, PDF (18/31 Pages) Texas Instruments – TS5A3166 0.9-Ω SPST Analog Switch

TS5A3166
SCDS186C – FEBRUARY 2005 – REVISED MAY 2015
Typical Application (continued)
1.0
0.9
T_A = 85_C
0.8
T_A = 25_C
0.7
0.6
0.5
0.4 _{TA = −40_C}
0.3
0.2
0.1
0.0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
V_COM (V)
Figure 27. r_on vs V_COM (V₊ = 5 V)
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10 Power Supply Recommendations
The power supply can be any voltage between the minimum and maximum supply voltage rating located in the
Recommended Operating Conditions.
Each V_CC terminal should have a good bypass capacitor to prevent power disturbance. For devices with a single
supply, a 0.1-μF bypass capacitor is recommended. If there are multiple pins labeled V_CC, then a 0.01-μF or
0.022-μF capacitor is recommended for each V_CC because the V_CC pins will be tied together internally. For
devices with dual supply pins operating at different voltages, for example V_CC and V_DD, a 0.1-µF bypass
capacitor is recommended for each supply pin. It is acceptable to parallel multiple bypass capacitors to reject
different frequencies of noise. 0.1-μF and 1-μF capacitors are commonly used in parallel. The bypass capacitor
should be installed as close to the power terminal as possible for best results.
11 Layout
11.1 Layout Guidelines
Reflections and matching are closely related to loop antenna theory, but different enough to warrant their own
discussion. When a PCB trace turns a corner at a 90° angle, a reflection can occur. This is primarily due to the
change of width of the trace. At the apex of the turn, the trace width is increased to 1.414 times its width. This
upsets the transmission line characteristics, especially the distributed capacitance and self–inductance of the
trace — resulting in the reflection. It is a given that not all PCB traces can be straight, and so they will have to
turn corners. Figure 28 shows progressively better techniques of rounding corners. Only the last example
maintains constant trace width and minimizes reflections.
18
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