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AT73C240
4. Delay 5 ms
5. Set ONDAC to 1 (bit 4 and 5 in register @0x00)
6. Reprogram all DAC settings (Audio format, gains, etc.)
7. Start I2S.
11.2
11.2.1
Audio Power Amplifier Power on Sequence
To avoid an audible “click” at start-up, the input capacitors must be pre-charged before the
power amplifier.
1. At start-up, disable APAON, APAGAIN<3:0> set to -22 dB, enable APAPRECH.
2. Wait 50 ms minimum.
3. Then disable APAPRECH and enable APAON.
4. Wait 10 ms min time.
5. Set the gain to the value chosen.
Audio Power Amplifier Power off Sequence
To avoid an audible “click” at power-off, the gain should be set to the minimum gain (-22 dB)
before turning off the power amplifier.
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6464A–PMAAC–28-Apr-09
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