PCM1600 Burr-Brown Corporation, PCM1600 Datasheet - Page 17

• Manufacturer Part Number: PCM1600
• Description: 24-Bit/ 96kHz Sampling/ 6-Channel/ Enhanced Multi-Level/ Delta-Sigma DIGITAL-TO-ANALOG CONVERTER
• Manufacturer: Burr-Brown Corporation

Register 7
R/W
ATLD
ATTS
MUTx
Read/Write Mode Select
When R/W = 0, a Write operation is performed.
When R/W = 1, a Read operation is performed.
Default Value: 0
Attenuation Control
This bit is Read/Write.
Default Value: 0
The ATLD bit must be set to logic “1” in order for the attenuators to function. Setting ATLD to logic “0” will
disable the attenuator function and cause the current attenuator data to be lost.
Set ATLD = 1 immediately after reset.
Attenuation Rate Select
This bit is Read/Write.
Default Value: 0
Changes in attenuator levels are made by incrementing or decrementing the attenuator by one step (0.5dB) for
every 2/f
audible ‘clicking’, or zipper noise, while the attenuator is changing levels. The ATTS bit allows you to select
the rate at which the attenuator is decremented/incremented during level transitions.
Soft Mute Control
where x = 1-6, corresponding to the DAC output V
These bits are Read/Write.
Default Value: 0
The mute bits, MUT1 through MUT6, are used to enable or disable the Soft Mute function for the
corresponding DAC outputs, V
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 will be decremented
from the current setting to the infinite attenuation setting one attenuator step (0.5dB) at a time, with the rate
of change programmed by the ATTS bit. This provides a quiet, ‘pop’ free muting of the DAC output. Upon
returning from Soft Mute, by setting MUTx = 0, the attenuator will be incremented one step at a time to
the previously programmed attenuator level.
B15
R/W
ATLD = 0
ATLD = 1
ATTS = 0
ATTS = 1
MUTx = 0
MUTx = 1
IDX6
S
B14
or 4/f
IDX5
B13
S
time interval until the programmed attenuator setting is reached. This helps to minimize
Attenuation Control Disabled (default)
Attenuation Control Enabled
Attenuation rate is 2/f
Attenuation rate is 4/f
Mute Disabled (default)
Mute Enabled
IDX4
B12
IDX3
B11
OUT
1 through V
IDX2
B10
S
S
IDX1
(default)
B9
17
OUT
IDX0
B8
6. The Soft Mute function is incorporated into the digital
OUT
x.
ATLD
B7
ATTS
B6
PCM1600, PCM1601
MUT6
B5
MUT5
B4
MUT4
B3
MUT3
B2
MUT2 MUT1
B1
B0
®