APPLICATIONS SUGGESTIONS (See Test and Application Circuit)

The recommended values of the external components are those shown on the application circuit. Differ-

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

Comp.

Value

Purpose

Larger Than

Smaller Than

R1

22K

Ω (*)

Input Impedance

Increase of Input

Impedance

Decrease of Input

Impedance

R2

560

Ω

Closed Loop Gain set to

32dB (**)

Decrease of Gain

Increase of Gain

R3

22K

Ω (*)

Increase of Gain

Decrease of Gain

R4

22K

Ω (*)

Input Impedance @ Mute

R5

22K

Ω

Stand-by Time Constant

R6

4.7

Ω

Frequency Stability

Danger of oscillations

Danger of oscillations

C1

1

µF

Input DC Decoupling

Higher Low-frequency

cut-off

C2

10

µF

Feedback DC Decoupling

Higher Low-frequency

cut-off

C3

10

µF

Stand-by Time Constant

C4

0.100

µF

Frequency Stability

Danger of Oscillations

C5, C6

1000

µF

Supply Voltage Bypass

(*) R1 = R3 = R4 for POP optimization

(**) Closed Loop Gain has to be

≥ 30dB

Figure 1: Output Power vs. Supply Voltage

Figure 2: Distortion vs. Output Power

TYPICAL CHARACTERISTICS

TDA7298

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