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AT73C213
5. Write @0x10 => 0x03 (RSTMSK=0)
6. Delay 5 ms
7. Set ONDAC to 1 (bit 4 and 5 in register @0x00)
8. Reprogram all DAC settings (Audio format, gains, etc.)
9. Start I2S.
9.2
9.2.1
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, set APAON off, APAGAIN<3:0> set to -22 dB, set APAPRECHARGE to 1.
2. Wait 50 ms minimum.
3. Then disable APAPRECH and set 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.
10. Current Consumption in Different Modes
Table 10-1.
Current Consumption in Different Modes
Mode
0: Off
1: Standby
2: DAC Playback through Stereo Headset
(Current in the load not included)
3: Stereo DAC Playback to Audio PA
(Current in the load not included)
4: Playback from Mono in to Audio PA
(Current in the load not included)
5: Playback from Stereo Line Input to Stereo Headset
(Current in the load not included)
Current Consumption (typ)
5
250
5100
9500
6200
1600
Current Consumption (max)
12
350
6700
13500
10500
3300
Unit
uA
uA
uA
uA
uA
uA
31
2744B–PMAAC–11-Apr-08
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