TDA2SA datasheet(338/427 Pages) TI2

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SWPS040-176

1.0e+01

1.0e+00

1.0e–01

1.0e–02

1.0e–03

1.0e–04

1.00e–002

1.00e+000

1.00e+002

Frequency (MHz)

1.00e+004

1.00e+006

1.00e+008

S-Parameter Magnitude

Job: GCM155R71E153KA55_15NF;

X =1/ C

X = L

Resonant frequency

(55 MHz) (minimum)

where :

w =

ESR +ωESL

ωC

2π

ωESL

ωC

SWPS040-e002

ESL

ESR

SWPS040-175

338

TDA2SX, TDA2SG, TDA2SA

TDA2HG, TDA2HV, TDA2HF, TDA2LF

SPRS951F – DECEMBER 2015 – REVISED MAY 2019

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Product Folder Links: TDA2SX TDA2SG TDA2SA TDA2HG TDA2HV TDA2HF TDA2LF

Applications, Implementation, and Layout

Figure 8-12. Characteristics of a Real Capacitor With ESL and ESR

The magnitude of the impedance of this series model is given as:

Figure 8-13. Series Model Impedance Equation

Figure 8-14 shows the resonant frequency response of a typical capacitor with a self-resonant frequency

of 55 MHz. The impedance of the capacitor is a combination of its series resistance and reactive

capacitance and inductance as shown in the equation above.

Figure 8-14. Typical Impedance Profile of a Capacitor

Because a capacitor has series inductance and resistance that impacts its effectiveness, it is important

that the following recommendations are adopted in placing capacitors on the PDN.

Wherever possible, mount the capacitor with the geometry that minimizes the mounting inductance and

resistance. This was shown earlier in Figure 8-1. The capacitor mounting inductance and resistance

values include the inductance and resistance of the pads, trace, and vias. Whenever possible, use

footprints that have the lowest inductance configuration as shown in Figure 8-15

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