TAS5036AIPFCRG4 datasheet(26/62 Pages) TI

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Architecture Overview

SLES061B—November 2002—Revised January 2004

TAS5036A

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

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 TAS5036A 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 TAS5036A 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 TAS5036A 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 = 44.1 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.

−10

3.18 (50

µs)

10.6 (15

µs)

f − Frequency − kHz

De-Emphasis

Figure 2−11. De-Emphasis Filter Characteristics

2.4

Pulse-Width Modulator (PWM)

The TAS5036A contains six channels of high performance digital Equibit PWM modulators that are designed

to drive switching output stages (back ends) in both single-ended (SE) and H-bridge (bridge tied load)

configuration. The TAS5036A device uses noise shaping and sophisticated error correction algorithms to

achieve high power efficiency and high-performance digital audio reproduction.

The PWM provides six pseudodifferential outputs to drive six monolithic power stages (such as TAS5110) or

six discrete differential power stages using gate drivers (such as the TAS5182) and MOSFETs in single-ended

or bridged configurations. The TAS5036A also provides a high-performance differential output that can be

used to drive an external analog headphone amplifier.

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