Datasheet

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PCM1774
SLAS551 – JULY 2007
Register 125
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
Register 125 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV PTM1 PTM0 RES4 RES3 RES2 RES1 RES0
IDX[6:0]: 111 1101b (7Dh): Register 125
PTM[1:0]: Power-Up/Down Time Control
Default value: 00
RES[4:0]: Resister Value Control
Default value: 1 1100
These bits are used to optimize audible pop noise and ramp up time for headphone output at device power
on/off.
Table 11. Power Up/Down Time Control
RES[1:0] V
COM
REGISTER VALUE
1 0000 60 k Ω
1 1000 24 k Ω
1 1100 12 k Ω
1 1110 6 k Ω
Others Reserved
V
COM
CAPACITOR POWER-UP TIME POWER-DOWN
RES[4:0] PTM[1:0] NOTE
[ μ F] [ms] TIME [ms]
1 1110 00 450 750
1 1100 11 900 1500
10
1 1000 Do not set. – –
1 0000 Do not set. – –
1 1110 01 250 400
1 1100 00 450 750 Default
4.7
1 1000 11 900 1500
1 0000 Do not set. – –
1 1110 10 100 300
1 1100 01 250 400
2.2
1 1000 00 450 750
1 0000 11 900 1500
1 1110 Do not set. – –
1 1100 10 100 300
1
1 1000 01 250 400
1 0000 00 450 750
41
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