TAS5036IPFCR datasheet(23/49 Pages) TI

23 / 49 page

Architecture Overview

SLES044B—November 2002

TAS5036

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 TAS5036 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

D 7

D 6

D 5

D 4

D 3

D 2

D 1

D 0

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 noiseless hard mute state. There are two

methods in which the TAS5036 can be placed into mute. The TAS5036 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 TAS5036

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 Auto Mute

Auto mute 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 auto mutes an individual channel when a channel

receives from 5 ms to 50 ms of consecutive zeros. This time interval can be selectable using the auto mute

delay register. The default interval is 5 ms at 48 kHz. This duration is independent of the sample rate. The auto

mute state is exited when two consecutive samples of nonzero data are received.

This mode uses the valid low to provide a low-noise floor while maintaining a short startup 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 TAS5036 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 TAS5036 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.

Table 2–10. De-Emphasis Filter Characteristics

DEM_SEL2 (MSB)

DEM_SEL1

DESCRIPTION

De-emphasis disabled

De-emphasis enabled for Fs = 48 kHz

De-emphasis enabled for Fs = 44 kHz

De-emphasis enabled for Fs = 32 kHz

Following the change of state of the de-emphasis bits, the PWM outputs go into the soft mute state. After 128

LRCLK periods for initialization, the PWM outputs are driven to the normal (unmuted) mode.

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