PCM1789 datasheet(29/39 Pages) TI

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PCM1789

www.ti.com.............................................................................................................................................................................................. SBAS451 – OCTOBER 2008

DEC

HEX

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

Left channel mute disabled

Left channel mute enabled

Right channel mute disabled

Right channel mute enabled

DEC

HEX

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

Left channel zero input not detected

Left channel zero input detected

Right channel zero input not detected

Right channel zero input detected

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