TAS5518 datasheet(19/103 Pages) TI

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Introduction

SLES115 — August 2004

TAS5518

The DAP accepts 24-bit data signal from the serial data interface and outputs 32-bit data to the PWM section.

The DAP supports two configurations, one for 32-kHz – 96-kHz data and one for 176.4-kHz to 192-kHz data.

1.4.5.1

TAS5518 Audio Processing Configurations

The 32 − 96 kHz configuration supports eight channels of data processing that can be configured as eight

channels or six channels with two channels for separate stereo line outputs.

The 176.4 − 192 kHz configuration supports three channels of signal processing with five channels passed

though (or derived from the three processed channels).

To efficiently support the processing requirements of both multi-channel 32 – 96-kHz data and the two channel

176.4 and 192-kHz data, the TAS5518 supports separate audio processing features for 32 –96-kHz data rates

and for 176.4 and 192 kHz. See Table 2 for a summary of TAS5518 processing feature sets.

1.4.5.2

TAS5518 Audio Signal Processing Functions

The DAP provides 10 primary signal processing functions.

1. The data processing input has a full 8x8 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 auto mute.

3. Seven biquads per channel

4. Four soft bass and treble tone controls with ±18 dB range, programmable corner frequencies, and 2nd

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 are provided

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

8. 8x2 output mixer (channels 1−6). Each output can be any ratio of any two signal processed channels.

9. 8x3 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 TAS5518 and then

select when needed.

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