TAS5076 datasheet(24/64 Pages) TI

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Architecture Overview

SLES090A—November 2003—Revised January 2004

TAS5076

The volume for each channel can be set using a single- or multiple-address write operation to the volume

control register via the serial control interface. Changing the volume of all six channels requires that 6 registers

be updated.

To coordinate the volume adjustment of multiple channels simultaneously, the TAS5076 performs a delayed

volume update upon receiving a volume change command. Following the completion of the register volume

write operations, the TAS5076 waits for 5 ms for another volume command to be given. If no volume command

is issued in that period of time, the TAS5076 starts adjusting the volume of the channels that received volume

settings.

While a volume update is being performed, the system status register indicates that the update is in progress.

During the update, all subsequent volume control setting requests that are sent to the TAS5076 are received

and stored as a single next value for a subsequent update. If more than one volume setting request is sent,

only the last is retained.

Table 2−9. Volume Register

VOLUME REGISTER

Vol

Bit 7

Vol

Bit 6

Vol

Bit 5

Vol

Bit 4

Vol

Bit 3

Vol

Bit 2

Vol

Bit 1

Vol

Bit 0

2.3.2 Mute

The application of mute ramps the volume from any setting to the noiseless hard-mute state. There are two

methods in which the TAS5076 can be placed into mute. The TAS5076 is placed in the noiseless mute when

the MUTE terminal is asserted low for a minimum of 3 MCLK_IN cycles. Alternatively, the mute mode can be

initiated by setting the mute bit in the system control register through the serial control interface. The TAS5076

is held in mute state as long as the terminal is low or I2C mute setting is active. This command uses quiet entry

and exit sequences to and from the hard-mute state.

If an error recovery (described in the PWM section) occurs after a mute request has been received, the device

returns from error recovery with the channel volume set as specified by the mute command.

2.3.3 Automute

Automute is an automatic sequence that can be enabled or disabled via the serial control interface. The default

for this control is enabled. When enabled, the PWM automutes an individual channel when a channel receives

from 5 ms to 50 ms of consecutive zeros. This time interval can be selectable using the automute delay

exited when two consecutive samples of nonzero data are received. The TAS5076 exit from automute is

performed quickly and preserves all music information.

This mode uses the valid low to provide a low-noise floor while maintaining a short start-up time. Noise free

entry and exit is achieved by using the PWM quiet start and stop sequences.

2.3.4 Individual Channel Mute

Individual channel mute is invoked through the serial interface. Individual channel mute permits each channel

of the TAS5076 to be individually muted and unmuted. The operation that is performed is identical to the mute

operation; however, it is performed on a per-channel basis. A TAS5076 channel is held in the mute state as

long as the serial interface mute setting for that channel is set.

2.3.5 De-Emphasis Filter

For audio sources that have been pre-emphasized, a precision 50-

µs/15-µs de-emphasis filter is provided to

support the sampling rates of 32 kHz, 44.1 kHz, and 48 kHz. See Figure 2−11 for a graph showing the

de-emphasis filtering characteristics. De-emphasis is set using two bits in the system control register.

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