Datasheet

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Register Definitions
PCM1772 , PCM1773
SLES010G – SEPTEMBER 2001 – REVISED MARCH 2007
Register 01
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 MUTR MUTL ATL5 ATL4 ATL3 ATL2 ATL1 ATL0
IDX[6:0]: 000 0001b
MUTx: Soft Mute Control
Where, x = L or R, corresponding to the line output V
OUT
L or V
OUT
R.
Default Value: 0
MUTL, MUTR = 0 Mute disabled (default)
MUTL, MUTR = 1 Mute enabled
The mute bits, MUTL and MUTR, enable or disable the soft mute function for the corresponding line outputs,
V
OUT
L and V
OUT
R. The soft mute function is incorporated into the digital attenuators. When mute is disabled
(MUTx = 0), the attenuator and DAC operate normally. When mute is enabled by setting MUTx = 1, the digital
attenuator for the corresponding output is decreased from the current setting to infinite attenuation, one
attenuator step (1 dB) at a time. This provides pop-free muting of the line output.
By setting MUTx = 0, the attenuator is increased one step at a time to the previously programmed attenuation
level.
ATL[5:0]: Digital Attenuation Level Setting for Line Output, V
OUT
L
Default value: 11 1111b
Line output, V
OUT
L, includes a digital attenuation function. The attenuation level can be set from 0 dB to –62 dB,
in 1-dB steps. Changes in attenuator levels are made by incrementing or decrementing by one step (1 dB) for
every 8/f
S
time internal until the programmed attenuator setting is reached. Alternatively, the attenuation level
can be set to infinite attenuation (or mute).
The following table shows attenuation levels for various settings:
ATL[5:0] ATTENUATION LEVEL SETTING
11 1111b 0 dB, no attenuation (default)
11 1110b –1 dB
11 1101b –2 dB
: :
00 0010b –61 dB
00 0001b –62 dB
00 0000b Mute
Register 02
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV RSV ATR5 ATR4 ATR3 ATR2 ATR1 ATR0
IDX[6:0]: 000 0010b
ATR[5:0]: Digital Attenuation Level Setting for Line Output, V
OUT
R
Default Value: 11 1111b
Line output, V
OUT
R, includes a digital attenuation function. The attenuation level can be set from 0 dB to –62 dB,
in 1-dB steps. Changes in attenuator levels are made by incrementing or decrementing by one step (1 dB) for
every 8/f
S
time internal until the programmed attenuator setting is reached. Alternatively, the attenuation level
can be set to infinite attenuation (or mute).
To set the attenuation levels for ATR[5:0], see the table for ATL[5:0], register 01.
24
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