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TAS5504A Datasheet(PDF) 29 Page - Texas Instruments

Part # TAS5504A
Description  4-Channel Digital Audio PWM Processor
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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TAS5504A Datasheet(HTML) 29 Page - Texas Instruments

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1.4.9.1
Automute and Mute Channel Controls
24-Bit Input
32 Bits in DSPE
Representation
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
Threshold Range
CD Data Range
DVD Data Range
M0013-01
TAS5504A
4-Channel Digital Audio PWM Processor
SLES169 – FEBRUARY 2006
The TAS5504A has individual channel automute controls that are enabled via I2C register 0x04 bits D5
and D6 (the default setting is enabled). Two separate detectors can trigger the automute:
• Input automute (I2C register 0x14): All channels are muted when all eight inputs to the TAS5504B are
less in magnitude than the input threshold value for a programmable amount of time.
• Output automute (I2C register 0x15): A single channel is muted when the output of the DAP section is
less in magnitude than the input threshold value for a programmable amount of time.
The detection period and thresholds for these two detectors are the same.
This time interval is selectable via I2C from 1 ms to 110 ms The increments of time are 1, 2, 3, 4, 5, 10,
20, 30, 40, 50, 60, 70, 80, 90, 100, and 110 ms. This interval is independent of the sample rate. The
default value is mask programmable.
The input threshold value is an unsigned magnitude that is expressed as a bit position. This value is
adjustable via I2C. The range of the input threshold adjustment is from below the LSB (bit position 0) to
below bit position 12 in a 24-bit input data word (bit positions 8 to 20 in the DSPE). This provides an input
threshold that can be adjusted for 12 to 24 bits of data. The default value is mask programmable.
Figure 1-14. Automute Threshold
The automute state is exited when the TAS5504A receives one sample that is greater than that of the
output threshold.
The output threshold can be one of two values:
• Equal to the input threshold
• 6 dB (one bit position) greater than the input threshold
The value for the output threshold is selectable via I2C. The default value is mask programmable.
The system latency enables the data value that is above the threshold to be preserved and output.
A mute command initiated by automute, master mute, individual I2C mute, the AM interference mute
sequence, or the bank switch mute sequence overrides an unmute command or a volume command.
While a mute command is activated, the commanded channels transition to the mute state. When a
channel is unmuted, it goes to the last commanded volume setting that has been received for that
channel.
Introduction
29


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