TDA7498 查看數據表（PDF） - STMicroelectronics
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TDA7498 Datasheet PDF : 28 Pages
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Applications information
TDA7498
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.
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 8
Figure 20. 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
TDA7498
MUTE
Figure 21. Turn on/off sequence for minimizing speaker “pop”
VCC
0
STBY
0
MUTE
0
Input
0
Output
0
Standby Mute
Play
Iq
0
t
t
t
t
t
Mute Standby
t
20/28
Doc ID 16107 Rev 8
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