Figure 23. Master and slave connection

SYNCLK

ROSC

Rosc

Cosc

ROSC

SYNCLK

39 k Ω

100 nF

Output

Inpu t

e

v

a

l

S

r

e

t

s

a

M

TDA7498

TDA7498

5.6

Output low-pass filter

To avoid EMI problems, it may be necessary to use a low-pass filter before the speaker. The cutoff frequency

should be larger than 22 kHz and much lower than the output switching frequency. It is necessary to choose the L

and C component values depending on the loudspeaker impedance. Some typical values, which give a cutoff

frequency of 27 kHz, are shown in Figure 24. Typical LC filter for an 8 Ω speaker and Figure 25. Typical LC filter

for a 6 Ω speaker below.

Figure 24. Typical LC filter for an 8 Ω speaker

Figure 25. Typical LC filter for a 6 Ω speaker

TDA7498

Output low-pass filter

DS6437 - Rev 10

page 14/22