TAS5508 datasheet(34/105 Pages) TI

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Biquads

Series

Bass

and

Treble

DRC

Bass and Treble

Bypass

Bass

and

Treble

Inline

Pre-

Volume

Post-

Volume

DRC

Bypass

DRC

Inline

B0016-02

From Input Mixer

To Output Mixer

Loudness

Channel Volume

Master

Volume

Max

Volume

TAS5508

8-Channel Digital Audio PWM Processor

SLES091D – FEBRUARY 2004 – REVISED JULY 2009

www.ti.com

All of the TAS5508 default values for DRC can be used except for the DRC1 decay and DRC2 decay.

Table 2-8 shows the recommended time constants and their hex values. If the user wants to implement

other DRC functions, Texas Instruments recommends using the automatic loudspeaker equalization (ALE)

tool available from Texas Instruments. The ALE tool allows the user to select the DRC transfer function

graphically. It then outputs the TAS5508 hex coefficients for download to the TAS5508.

Table 2-8. DRC Recommended Changes From TAS5508 Defaults

I2C

RECOMMENDED TIME

RECOMMENDED

DEFAULT HEX

SUBADDRESS

CONSTANT (ms)

HEX VALUE

0x98

DRC1 energy

0000 883F

DRC1 (1 – energy)

007F 77C0

0x9C

DRC1 attack

0000 883F

DRC1 (1 – attack)

007F 77C0

DRC1 decay

0001 538F

0000 00AE

DRC1 (1 – decay)

007E AC70

007F FF51

0x9D

DRC2 energy

0000 883F

DRC2 (1 – energy)

007F 77C0

0xA1

DRC2 attack

0000 883F

DRC2 (1 – attack)

007F 77C0

DRC2 decay

0001 538F

0000 00AE

DRC2 (1 – decay)

007E AC70

007F FF51

Recommended DRC set-up flow if the defaults are used:

• After power up, load the recommended hex value for DRC1 and DRC2 decay and (1 – decay). See

Table 2-8.

• Enable either the pre-volume or post-volume DRC.

Recommended DRC set-up flow if the DRC design uses values different from the defaults:

• After power up, load all DRC coefficients per the DRC design.

• Enable either the pre-volume or post-volume DRC.

Figure 2-16 shows the positioning of the DRC block in the TAS5508 processing flow. As seen, the DRC

input can come either before or after soft volume control and loudness processing.

Figure 2-16. DRC Positioning in TAS5508 Processing Flow

Figure 2-17 illustrates a typical DRC transfer function.

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