Datasheet

4341H–MP3–10/07

AT8xC51SND2C/MP3B

Table 15-27. PA Operating Mode

Table 15-28. PA Low Power Mode

15.3 Audio Supplies and Start-up

In operating mode AUDVBAT (supply of the audio power amplifier) must be between 3.2V and

5,5V.

AUDVDD, HSVDD and VDD must be inferior or equal to AUDVBAT.

A typical application is AUDVBAT connected to a battery and AUDVDD, HSVDD and VDD sup-

plied by regulators.

AUDVBAT must be present at the same time or before AUDVDD, HSVDD and VDD.

AUDRST must be active low (0) until the voltages are not etablished and reach the proper

values.

To avoid noise issues, it is recommended to use ceramic decoupling capacitors for each supply

closed to the package. The track of the supplies must be optimized to minimize the resistance

especially on AUDVBAT where all the current from the power amplifier comes from.

Note: Refer to the application diagram.

0110 5

0111 2

1000 -1

1001 -4

1010 -7

1011 -10

1100 -13

1101 -16

1110 -19

1111 -22

APAON APAPRECH Operating Mode

0 0 Stand-By

0 1 Input Capacitors Precharge

1 0 Active Mode

1 1 Forbidden State

APALP Power Mode

0 Low power mode

1 High power mode