We are using the TLV320AIC3204 in a low power system. To minimize power consumption, we turn the external power supply off (LDOIN --> 0 V).
If we turn the power supply back on, we hear and measure an audio signal on the outputs (HPL/HPR) before the system is ready/started.
The outputs are used in single ended configuration. RESET PIN and LDO Select PIN are Low.
We observed no difference, if we slowly ramp up the voltage from 0V to 2.4V (i.e. in 1 ms).
Does anyone have input on source and countermeasures to suppress this audio signal (it is before the TLV320 is up and running). Based on the datasheet (5.18.1.1.3) it is possible to turn off the external power supply.
best regards Urs
