APPLICATION SUGGESTIONS

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

ure 1. Different values can be used; the following table can help the designer.

COMPONENT

SUGGESTION

VALUE

PURPOSE

LARGER THAN

SUGGESTION

SMALLER THAN

SUGGESTION

R1

3.3K

Ω

Input switch circuit

Vpin #2 shifted downward Vpin #2 shifted upward

R2

3.3K

Ω

Input switch circuit

Vpin #2 shifted upward

Vpin #2 shifted downward

R3

100K

Ω

Input switch time

constant

Larger Input Switch Time

Smaller input switch time

R4

100K

Ω

Volume control time

constant

Larger Volume

Regulation Time

Smaller volume

regulation time

R5

10K

Ω

Mute time constant

Larger mute on/off time

Smaller mute on/off time

P1

50K

Ω

Volume control circuit

C1

1000

µF

Supply voltage bypass

Danger of oscillation

C2

100nF

Supply voltage bypass

Danger of oscillation

C3

470nF

Input DC decoupling

Lower low frequency

cutoff

Higher low frequency

cutoff

C4

470nF

Input DC decoupling

Lower low frequency

cutoff

Higher low frequency

cutoff

C5

470nF

Input DC decoupling

Lower low frequency

cutoff

Higher low frequency

cutoff

C6

300nF

Input- switch time

constant

Larger-Input- switch time

Smaller input- switch time

C7

300nF

Volume control time

constant

Larger volume regulation

time

Smaller volume regulation

time

C8

470

µF

Ripple Rejection

Better SVR

Worse SVR

C9

1

µF

Mute time constant

Larger mute on/off time

Smaller mute on/off time

C10

470

µF

Output DC decoupling

Lower low frequency

cutoff

Higher low frequency

cutoff

Ω; f = 1KHz;

5

10

15

20

25

30

Vs(V)

D96AU517

0

2

4

6

8

10

12

14

(W)

d=10%

d=1%

Figure 3: Output Power vs Supply Voltage

02

4

6

0.01

0.1

1

d

(%)

f=15KHz

f=1KHz

D96AU518

Figure 4: Distortion vs Output Power

TDA7494

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