TS4962 datasheet(36/46 Pages) STMICROELECTRONICS

36 / 46 page

Application information

TS4962

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We have the following equations:

In general, for mixed situations (single-ended and differential inputs) it is best to use the

same rule, that is, to equalize impedance on both TS4962 inputs.

4.10

Output filter considerations

The TS4962 is designed to operate without an output filter. However, due to very sharp

transients on the TS4962 output, EMI radiated emissions may cause some standard

compliance issues.

These EMI standard compliance issues can appear if the distance between the TS4962

outputs and the loudspeaker terminal is long (typically more than 50mm, or 100mm in both

directions, to the speaker terminals). As the PCB layout and internal equipment device are

different for each configuration, it is difficult to provide a one-size-fits-all solution.

However, to decrease the probability of EMI issues, there are several simple rules to follow:

●

Reduce, as much as possible, the distance between the TS4962 output pins and the

speaker terminals.

●

Use ground planes for “shielding” sensitive wires.

●

Place, as close as possible to the TS4962 and in series with each output, a ferrite bead

with a rated current at minimum 2.5A and impedance greater than 50

Ω at frequencies

above 30MHz. If, after testing, these ferrite beads are not necessary, replace them by a

short-circuit.

●

Allow enough footprint to place, if necessary, a capacitor to short perturbations to

ground (see Figure 63).

Out

–

300

in1

-------------

×… V

300

ink

-------------

(V)

ini

π R

ini

-------------------------------------------------------

(F)

ini

----------

∑

-------------------

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