TDA749313TR Datasheet, PDF (11/30 Pages) STMicroelectronics – 3-watt 3-watt dual BTL class-D audio amplifier

TDA7493
5
Applications information
Applications information
5.1
Note:
Mode selection
Pin STANDBY selects the operating mode, namely standby or play.
z In standby mode, all the circuits are turned off and there is very low leakage current.
z In play mode, the amplifiers are powered up.
During the turn on/off sequence, there are four operational states: standby, pre-charge,
mute and play. The pre-charge and mute states are two internal transient states to set up
the normal operating condition and to reduce the speaker pop noise.
Table 6. Mode selection
Logic level on pin STANDBY
0
1
Standby
Play
Mode
An internal pull-down resistor on pin STANDBY ensures that the default mode is standby.
5.2
Note:
Gain setting
The close loop gain is set by pins GAIN0 and GAIN1 as shown below in Table 7. The gain
setting is implemented by changing the feedback resistors of the amplifiers.
Table 7. Gain selection
Logic level on pin GAIN0
Logic level on pin GAIN1
0
0
0
1
1
0
1
1
Gv (nominal)
6.0 dB
12.0 dB
15.6 dB
18.0 dB
Internal pull-down resistors on pins GAIN0 and GAIN1 ensure that the default gain is 6 dB.
Doc ID 14570 Rev 6
11/30