TDA7498MV Datasheet, PDF (19/27 Pages) STMicroelectronics – 100-watt mono BTL class-D audio amplifier

TDA7498MV
Applications information
5.2
Mode selection
The three operating modes of the TDA7498MV are set by the two inputs, STBY (pin 20) and
MUTE (pin 21).
z Standby mode: all circuits are turned off, very low current consumption.
z Mute mode: inputs are connected to ground and the positive and negative PWM
outputs are at 50% duty cycle.
z Play mode: the amplifiers are active.
The protection functions of the TDA7498MV are realized by pulling down the voltages of the
STBY and MUTE inputs shown in Figure 19. The input current of the corresponding pins
must be limited to 200 µA.
Table 7. Mode settings
Standby
Mute
Mode
L ⁽¹⁾
H ⁽¹⁾
STBY
Play
H
1. Drive levels defined in Table 6: Electrical specifications on page 9
Figure 19. Standby and mute circuits
MUTE
X (don’t care)
L
H
Standby
3.3 V
0V
Mute
3.3 V
0V
R2
30 kΩ
R4
30 kΩ
C7
2.2 µF
C15
2.2 µF
STBY
TDA7498MV
MUTE
Figure 20. Turn-on/off sequence for minimizing speaker “pop”
VCC
0
STBY
0
MUTE
0
Input
0
Output
0
Standby Mute
Play
I_q
0
t
t
t
t
t
Mute Standby
t
Doc ID 16505 Rev 3
19/27