PCM3793A
PCM3794A
www.ti.com
SLAS529A–JANUARY 2007–REVISED FEBRUARY 2007
Table 3. Recommended Power-On Sequence
REGISTER
SETTINGS
STEP
NOTE
1
–
Turn on all power supplies(1)
2
4027h
4127h
4227h
4327h
4427h
4527h
4620h
4BC0h
5102h
5A10h
49E0h
5601h
4803h
5811h
49FCh
4C03h
4A01h
523Fh
5711h
4F0Ch
500Ch
–
Headphone amplifier L-ch volume (–6 dB)(2)
Headphone amplifier R-ch volume (–6 dB)(2)
Speaker amplifier L-ch volume (–6 dB)(2)
Speaker amplifier R-ch volume (–6 dB)(2)
Digital attenuator L-ch (–24 dB)(2)
3
4
5
6
7
Digital attenuator R-ch (–24 dB)(2)
DAC audio interface format (left-justified)(3)
8
9
Headphone detection enable and inverting polarity. Short and thermal detection enable
ADC audio interface format (left-justified)(3)
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
VCOM ramp up/down time control. PG1, PG2 gain control (0 dB)
DAC (DAL, DAR) and analog bias power up
Zero-cross detection enable
Analog mixer (MXL, MXR) power up
Analog mixer input (SW2, SW5) select
Headphone amplifier (HPL, HPR, HPC) power up
Speaker amplifier shut down release
VCOM power up
Analog front end (ADL, ADR, D2S, MCB, PG1, 2, 5, 6) power up
Analog input (MUX3, MUX4) select. Analog input (MUX1, MUX2) select
Analog input L-ch (PG3) volume (0 dB)(2)
Analog input R-ch (PG4) volume (0 dB)(2)
Any settings for other devices or wait time, 450 ms(4)(5)
Speaker amplifier (SPL, SPR) power up (5)
49FFh
(1) VDD should be turn on prior to or simultaneously with the other power supplies. It is recommended to set register data with the system
clock input after turning all power supplies on.
(2) Any level is acceptable for volume or attenuation. Level should be resumed by register data recorded when system power off.
(3) Audio interface format should be set to match the DSP or decoder being used.
(4) The PCM3793A requires time for VCOM to reach the common level from GND level. The delay depends on the capacitor value for VCOM
and the setting of register 125 PTM[1:0], RES[4:0]. The default setting is 450 ms at VCOM = 4.7 µs.
(5) The PCM3794A does not require this setting because it has no speaker output.
21
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