SM5876AM View Datasheet(PDF) - Nippon Precision Circuits
Part Name
Description
MFG CO.
'SM5876AM' PDF : 17 Pages View PDF
SM5876AM
Output mode setting (MDT 4-bit data)
The left-channel and right-channel outputs can be set
to any one of 16 different modes, as shown in table 2.
Table 2. Output mode control
PL0
PL1
PL2
PL3
Left-channel output Right-channel output
Notes
0
0
0
0
Mute
Mute
Mute
0
0
0
1
Mute
R
0
0
1
0
Mute
L
0
0
1
1
Mute
(L + R)/2
0
1
0
0
R
Mute
0
1
0
1
R
R
0
1
1
0
R
L
Reverse
0
1
1
1
R
(L + R)/2
1
0
0
0
L
Mute
1
0
0
1
L
R
Stereo
1
0
1
0
L
L
1
0
1
1
L
(L + R)/2
1
1
0
0
(L + R)/2
Mute
1
1
0
1
(L + R)/2
R
1
1
1
0
(L + R)/2
L
1
1
1
1
(L + R)/2
(L + R)/2
“Stereo” is the default after system reset.
“Mute” refers to soft muting.
Soft mute (output mode setting)
The channel output muting set by the output mode
control 4-bit data is soft mute mode.
The attenuation counter output decrements by 1 step
at a time, reducing the gain. The signal is completely
muted after a time of (1024/fs), which corresponds to
approximately 23.2 ms when fs = 44.1 kHz.
Conversely, when soft mute is released using the out-
put mode control, the attenuation counter output
increments by 1 step at a time, increasing the gain.
The time taken to return to 0 dB from full muting is
also (1024/fs).
When an attenuation value is set, the output gain
decreases from the value set by the attenuation data
until the gain is −∞. Similarly for mute release, the
output gain increases from the current value until the
gain is 0 dB.
Soft mute operation is shown in figure 3.
Upon system reset initialization, mute is released,
which corresponds to the maximum gain of 0 dB.
MUTE
0 dB
Gain
–∞
1024/fs
1024/fs
Figure 3. Soft mute operation example
Attenuator control (ATC flag)
The attenuator control (ATC) flag is input on MDT.
When the ATC flag is HIGH, the left-channel and
right-channel attenuator data is common. In this
mode, the left-channel data is used for both channels.
NIPPON PRECISION CIRCUITS—15
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