Datasheet

PCM1789
www.ti.com .............................................................................................................................................. SBAS451A – OCTOBER 2008 – REVISED JANUARY 2009
DEC HEX B7 B6 B5 B4 B3 B2 B1 B0
20 14 RSV RSV RSV RSV RSV RSV MUTDA2 MUTDA1
RSV Reserved
Reserved; do not use.
MUTDA[2:1] Soft Mute control
These bits are used to enable or disable the Soft Mute function for the corresponding DAC
outputs, VOUTx. The Soft Mute function is incorporated into the digital attenuators. When mute is
disabled (MUTDA[2:1] = 0), the attenuator and DAC operate normally. When mute is enabled by
setting MUTDA[2:1] = 1, the digital attenuator for the corresponding output is decreased from the
current setting to infinite attenuation. By setting MUTDA[2:1] = 0, the attenuator is increased to
the last attenuation level in the same manner as it is for decreasing levels. This configuration
reduces pop and zipper noise during muting of the DAC output. This Soft Mute control uses the
same resource of digital attenuation level setting. Mute control has priority over the digital
attenuation level setting.
Default value: 00.
MUTDA Soft Mute control
x0 Left channel mute disabled
x1 Left channel mute enabled
0x Right channel mute disabled
1x Right channel mute enabled
DEC HEX B7 B6 B5 B4 B3 B2 B1 B0
21 15 RSV RSV RSV RSV RSV RSV ZERO2 ZERO1
RSV Reserved
Reserved; do not use.
ZERO[2:1] Zero flag (read-only)
These bits indicate the present status of the zero detect circuit for each DAC channel; these bits
are read-only.
ZERO Zero flag
x0 Left channel zero input not detected
x1 Left channel zero input detected
0x Right channel zero input not detected
1x Right channel zero input detected
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Product Folder Link(s): PCM1789