9

Application suggestion

The recommended values of the external components are those shown on the application circuit of figure below.

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

Table 4. Application suggestion

Components Suggested value

Purpose

Larger than

suggested

Smaller than suggested

R1 (1)

22 k

Input resistance

Increase input

impedance

Decrease input impedance

R2

680 Ω

Closed loop gain set to 30

db(2)

Decrease of gain

Increase of gain

R3(1)

22 k

Increase of gain

Decrease of gain

R4

22 k

Standby time constant

Larger standby on/off

time

Smaller standby on/off time; pop

noise

R5

10 k

Mute time constant

Larger mute on/off time

Smaller mute on/off time

C1

0.47 µF

Input DC decoupling

Higher low frequency cut-off

C2

22 µF

Feedback DC decoupling

Higher low frequency cut-off

C3

10 µF

Mute time constant

Larger mute on/off time

Smaller mute on/off time

C4

10 µF

Standby time constant

Larger standby on/off

time

Smaller standby on/off time; pop

noise

C5

22 µF

Bootstrapping

Signal degradation at low

frequency

C6, C8

1000 µF

Supply voltage bypass

Danger of oscillation

C7, C9

0.1 µF

1. R1= R3 for pop optimization.

2. Closed loop gain has to be ≥ 24 dB.

TDA7296

Application suggestion

DS0179 - Rev 11

page 17/23