TAS5508C datasheet(20/107 Pages) TI

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TAS5508C

SLES257 – SEPTEMBER 2010

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The 176.4-kHz to 192-kHz configuration supports three channels of signal processing with five channels

passed though (or derived from the three processed channels).

To support efficiently the processing requirements of both multichannel 32-kHz to 96-kHz data and the

2-channel 176.4-kHz and 192-kHz data, the TAS5508C has separate audio-processing features for

32-kHz to 96-kHz data rates and for 176.4 kHz and 192 kHz. See Table 2-2 for a summary of TAS5508C

processing feature sets.

2.2.5.2

TAS5508C Audio Signal-Processing Functions

The DAP provides 10 primary signal-processing functions:

1. The data-processing input has a full 8×8 input crossbar mixer. This enables each input to be any ratio

of the eight input channels.

2. Two I2C programmable threshold detectors in each channel support automute.

3. Seven biquads per channel

4. Four soft bass and treble tone controls with ±18-dB range, programmable corner frequencies, and

second-order slopes. In 8-channel mode, bass and treble controls are normally configured as follows:

–

Bass and treble 1: Channel 1 (left), channel 2 (right), and channel 7 (center)

–

Bass and treble 2: Channel 3 (left surround) and channel 4 (right surround)

–

Bass and treble 3: Channel 5 (left back surround) and channel 6 (right back surround)

–

Bass and treble 4: Channel 8 (subwoofer)

5. Individual channel and master volume controls. Each control provides an adjustment range of 18 dB to

–127 dB. This permits a total volume device control range of 36 dB to –127 dB plus mute. The master

volume control can be configured to control six or eight channels. The DAP soft volume and mute

update interval is I2C programmable. The update is performed at a fixed rate regardless of the sample

rate.

6. Programmable loudness compensation that is controlled via the combination of the master and

individual volume settings.

7. Two dual-threshold dual-rate dynamic range compressors (DRCs). The volume gain values provided

are used as input parameters using the maximum RMS (master volume × individual channel volume).

8. 8×2 output mixer (channels 1–6). Each output can be any ratio of any two signal-processed channels.

9. 8×3 output mixer (channels 7 and 8). Each output can be any ratio of any three signal-processed

channels.

10. The DAP maintains three sets of coefficient banks that are used to maintain separate sets of

sample-rate-dependent parameters for the biquad, tone controls, loudness, and DRC in RAM. These

can be set to be automatically selected for one or more data sample rates or can be manually selected

under I2C program control. This feature enables coefficients for different sample rates to be stored in

the TAS5508C and then selected when needed.

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