SBAS452 – SEPTEMBER 2008 ......................................................................................................................................................................................... www.ti.com
DEC
HEX
B7
B6
B5
B4
B3
B2
B1
B0
68
44
MUTDA8
MUTDA7
MUTDA6
MUTDA5
MUTDA4
MUTDA3
MUTDA2
MUTDA1
MUTDA[8:1] DAC Soft Mute control
These bits are used to enable or disable the Soft Mute function for the corresponding DAC
outputs, VOUT. The Soft Mute function is incorporated into the digital attenuators.
When Mute is disabled (MUTDA[8:1] = 0), the attenuator and DAC operate normally. When Mute
is enabled by setting MUTDA[8:1] = 1, the digital attenuator for the corresponding output
decreases from the current setting to infinite attenuation with an s-curve response and time set
by ATSPDA.
By setting MUTDA[8:1] = 0, the attenuator increases to the last attenuation level with s-curve
response in the same manner as it is for decreasing levels. This configuration provides pop and
zipper noise-free muting of the DAC output.
The Soft Mute control uses the same digital attenuation level resource setting as the DAC. Mute
control has priority over the digital attenuation level setting.
Default value: 0000 0000.
MUTDA
DAC Soft Mute control
xxxx xxx0
DAC1 Mute disabled
xxxx xxx1
DAC1 Mute enabled
xxxx xx0x
DAC2 Mute disabled
xxxx xx1x
DAC2 Mute enabled
xxxx x0xx
DAC3 Mute disabled
xxxx x1xx
DAC3 Mute enabled
xxxx 0xxx
DAC4 Mute disabled
xxxx 1xxx
DAC4 Mute enabled
xxx0 xxxx
DAC5 Mute disabled
xxx1 xxxx
DAC5 Mute enabled
xx0x xxxx
DAC6 Mute disabled
xx1x xxxx
DAC6 Mute enabled
x0xx xxxx
DAC7 Mute disabled
x1xx xxxx
DAC7 Mute enabled
0xxx xxxx
DAC8 Mute disabled
1xxx xxxx
DAC8 Mute enabled
42
Copyright 2008, Texas Instruments Incorporated