Applications information

TDA7498

20/28

Doc ID 16107 Rev 8

4.2

Mode selection

The three operating modes of the TDA7498 are set by the two inputs, STBY (pin 20) and

MUTE (pin 21).

●

Standby mode: all circuits are turned off, very low current consumption.

●

Mute mode: inputs are connected to ground and the positive and negative PWM

outputs are at 50% duty cycle.

●

Play mode: the amplifiers are active.

The protection functions of the TDA7498 are enabled by pulling down the voltages of the

STBY and MUTE inputs shown in Figure 20. The input current of the corresponding pins

must be limited to 200 µA.

Figure 20.

Standby and mute circuits

Figure 21.

Turn on/off sequence for minimizing speaker “pop”

Table 7.

Mode settings

Mode

STBY

MUTE

Standby

1.

Drive levels defined in Table 6: Electrical specifications on page 8

X (don’t care)

Mute

H (1)

L

Play

H

H

STBY

MUTE

0 V

3.3 V

C7

2.2 µF

R2

30 k

Ω

Standby

0 V

3.3 V

C15

2.2 µF

R4

30 k

Ω

Mute

TDA7498

VCC

STBY

MUTE

Input

Output

Standby Mute

Play

Mute

Standby

t

t

t

t

t

t

0

0

0

0

0

0