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11. Supplies and Start-up
In operating mode, VBAT (supply of the audio power amplifier) must be between 3V and 5.5V
and AVDD, AVDDHS and VDIG must be inferior or equal to VBAT and lower than 3.3V.
A typical application is VBAT connected to a battery and AVDD, AVDDHS and VDIG supplied by
regulators. VBAT must be present at the same time or before AVDD, AVDDHS and VDIG.
RSTB must be active (0) until the voltages are stable and reach the proper values.
To avoid noise issues, it is recommended to use ceramic decoupling capacitors for each supply
close to the package as defined in the application diagram. See Figure 13-1 on page 33 .
The track of the supplies must be optimized to minimize the resistance, especially on VBAT
where all the current from the power amplifier comes from.
HPN and HPP must be routed symmetrically and the resistance must be minimized, at the
expense of maximum output power capabilities reduction.
11.1
11.1.1
11.1.2
11.1.3
30
Audio DAC Start-up Sequences
In order to minimize the noise during the start-up, a specific sequence should be applied.
In any audio configuration, always force Bit 2 to high level (“1”) at 0x0B address.
Power on Example
Path DAC to headset output
1. Write @0x10 => 0x03 (deassert the reset)
2. Write @0x0C => 0x1F (precharge + master on)
3. Write @0x00 => 0x0C (ONLNOL and ONLONOR set to 1)
4. Delay 500 ms
5. Write @0x0C => 0x01 (precharge off + master on)
6. Delay 1ms
7. Write @0x00 => 0x3C (ONLNOL, ONLNOR, ONDACR and ONDACL set to 1)
Power off Example
1. Write @0x00 => 0xC0 (ONDACR and ONDACL set to 0)
2. Write @0x0C => 0x00 (master off)
3. Delay 1ms
4. Write @0x00 => 0x00 (all off)
I2S Example
In order to prevent I2S from generating noise at the output (for example a MP3 player switching
from one song to another):
1. Set ONDAC to 0 ((bit 4 and 5 in register @0x00)
2. Stop I2S and MCLK
When I2S is restarted, in order to prevent noise generation at the output:
1. Start MCLK
2. Write @0x10 => 0x00 (RESFILZ=0, RSTZ=0)
3. Write @0x10 => 0x03 (RESFILZ=1, RSTZ=1)
AT73C240
6464A–PMAAC–28-Apr-09
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