5/16

TDA7294S

Figure 4. Typical Application P.C. Board and Component Layout (scale 1:1)

3

Application Suggestions (see Test and Application Circuits of the Fig. 2)

The recommended values of the external components are those shown on the application circuit of Figure

2. Different values can be used; the following table can help the designer.

Table 6. Application Suggestions

COMPONENTS

SUGGESTED

VALUE

PURPOSE

LARGER THAN

SUGGESTED

SMALLER THAN

SUGGESTED

R1 (*)

22k

INPUT RESISTANCE

INCREASE INPUT

IMPEDANCE

DECREASE INPUT

IMPEDANCE

R2

680

Ω

CLOSED LOOP GAIN

SET TO 30dB (**)

DECREASE OF GAIN

INCREASE OF GAIN

R3 (*)

22k

INCREASE OF GAIN

DECREASE OF GAIN

R4

22k

ST-BY TIME

CONSTANT

LARGER ST-BY

ON/OFF TIME

SMALLER ST-BY ON/

ON/OFF TIME;

POP NOISE

R5

10k

MUTE TIME

CONSTANT

LARGER MUTE

ON/OFF TIME

SMALLER MUTE

ON/OFF TIME

C1

0.47

µF

INPUT DC

DECOUPLING

HIGHER LOW

FREQUENCY

CUTOFF

C2

22

µF

FEEDBACK DC

DECOUPLING

HIGHER LOW

FREQUENCY

CUTOFF

C3

10

µFMUTE TIME

CONSTANT

LARGER MUTE

ON/OFF TIME

SMALLER MUTE

ON/OFF TIME