TAS5076 datasheet(23/64 Pages) TI

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Architecture Overview

SLES090A—November 2003—Revised January 2004

TAS5076

LRCLK is absent:

•

LRCLK error

MCLK is the wrong frequency, changing frequency, or absent:

•

DCLK phase error with respect to MCLK

•

MCLK phase error with respect to DCLK

•

PWM timing error

SCLK is the wrong frequency or absent

•

SCLK error

2.3

Signal Processing

This section contains the signal processing functions that are contained in the TAS5076. The signal

processing is performed using a high-speed 24-bit signal processing architecture. The TAS5076 has the

following signal processing features:

•

Individual channel soft volume with a range of 24 dB to −114 dB plus mute

•

Soft mute

•

Automute

•

50-

µs/15-µs de-emphasis filter supported in the sampling rates 32 kHz, 44.1 kHz, and 48 kHz

2.3.1 Volume Control

The gain of each output can be adjusted by a soft digital volume control for each channel. Volume adjustments

are performed using a soft gain update s-curve, which is approximated using a second-order filter fit. The curve

fit is performed over a transition interval between 41 ms and 65 ms.

The volume of each channel can be adjusted from mute to −114 dB to 24 dB in 0.5 dB steps. Because of the

numerical representation that is used to control the volume, at very low volume levels the step size increases

for gains of that are less than −96 dB. The default volume setting following power up or reset is 0 dB for all

channels. The step size adjustment is linear down to approximately −90 dB, see Figure 2−10.

Attenuation (Gain) − dB

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

−110

−100

−90

−80

−70

−60

−50

−40

−30

−20

−10

STEP SIZE

ATTENUATION (GAIN)

Figure 2−10. Attenuation Curve

The volume control format for each channel is expressed in 8 bits. The volume for each channel is set by writing

8 bits via the serial control interface. The MSB bit is written first as in the bit position 0 (LSB position).

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