TAS5705PAP datasheet(40/71 Pages) TI

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Loudness Function

Volume

Biquad(0x24)

From

Input

Mux

Output

Mux

Loudness

Biquad(0x23)

Gain=G

1ifVol

1/G

0ifVol

1/G+1/Scale

Scale(Vol

1/G)otherwise

0ifVol

1/G

1ifVol

1/G+1/Scale

Scale(Vol

1/G)otherwise

B0273-01

Scale=1/(1

1/G)

TAS5705

SLOS549 – JUNE 2008 ...................................................................................................................................................................................................... www.ti.com

AM Controls

There are three controls for the AM section.

• AM Mode Enable—This control enables and disables sample rate conversion for 38, 44.1 and 48 kHz.

• AM Search Sequence—The sequence the device will search for switching frequency that avoids interference

• AM Tuned Frequency—The AM tuned frequency is encoded as four binary-encoded decimal digits, held in

two registers, representing the tuned frequency in kHz. The range of valid values is from 1999 kHz to 0500

KHz.

When the TAS5705 receives a change to any of these inputs, it

1. Performs a fast (128-step) mute

2. Performs the requested AM interference avoidance operation

If requested, enables/disables the AM mode

If requested, selects the requested AM search sequence

Selects and sets the appropriate SRC rate

3. Performs a fast (128 step) unmute

The TAS5705 provides a direct form I biquad for loudness on the subwoofer channel. The first biquad is

contained in a gain-compensation circuit that maintains the overall system gain at 1 or less to prevent clipping at

loud volume settings. This gain compensation is shown in Figure 46.

Figure 46. Biquad Gain Control Structure

Table 3. Loudness Table Example for Gain = 4, 1/G = 0.25, Scale = 1.33

Volume

0.125

0.25

0.375

0.5

0.625

0.75

0.875

1.125

1.25

1.375

1.5

1.625

1.75

1.875

Biquad path

0.833

0.666

0.5

0.333

0.166

Direct path

0.166

0.333

0.5

0.666

0.833

Total gain

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