TAS5504 datasheet(28/96 Pages) TI

28 / 96 page

Introduction

SLES123 − October 2004

TAS5504

The TAS5504 has a single set of loudness controls for the four channels. The loudness control input uses the

Maximum individual master volume (V) to control the loudness that is applied to all channels. In 192-kHz and

176.4-kHz modes, the loudness function is active only for channels 1, 2, and 4.

Audio In

Audio Out

Loudness Function = f (V)

Loudness

Biquad

H(Z)

Figure 1−15. Loudness Compensation Functional Block Diagram

Loudness Function = f (V) = G x [2 [(Log V) x LG + LO]] + O

or alternatively,

Loudness Function = f (V) = G x [V LG x 2LO] + O

For example, for the default values LG = −0.5, LO = 0.0, G = 1.0, and O = 0.0 then:

Loudness Function = 1 / SQRT (V) which is the recommended transfer function for loudness. So,

Audio Out = (Audio In) x V + H (Z) x SQRT (V). Other transfer functions are possible.

Table 1−6. Default Loudness Compensation Parameters

LOUDNESS

DESCRIPTION

USAGE

DATA

I2C

SUB ADD

DEFAULT

LOUDNESS

TERM

DESCRIPTION

USAGE

DATA

FORMAT

SUB-ADD

RESS

HEX

FLOAT

Max volume

Gains audio

5.23

Log V

Log2 (max volume)

Loudness function

5.23

00000000

0.0

H (Z)

Loudness biquad

Controls shape of

Loudness curves

5.23

0x95

b0 = 0000D513

b1 = 00000000

b2 = 0FFF2AED

a1 = 00FE5045

a2 = 0F81AA27

b0 = 0.006503

b1 = 0

b2 = −0.006503

a1 = 1.986825

a2 = −0.986995

Gain (log space)

Loudness function

5.23

0x91

FFC00000

−0.5

Offset (log space)

Loudness function

25.23

0x92

00000000

Gain

Switch to enable

Loudness (ON = 1,

OFF = 0)

5.23

0x93

00000000

Offset

Provides offset

25.23

0x94

00000000

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