TAS5504 datasheet(25/96 Pages) TI

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Introduction

SLES123 − October 2004

TAS5504

Z−1

∑

Magnitude

Truncation

Z−1

∑

Magnitude

Truncation

Z−1

Figure 1−13. Biquad Filter Structure

All five coefficients for one biquad filter structure are written to one I2C register containing 20 bytes (or five

32-bit words). The structure is the same for all biquads in the TAS5504. Registers 0x51 – 0x88 show all the

biquads in the TAS5504. Note that u(31:28) bits are unused and default to 0x0.

Table 1−3. Contents of One 20-Byte Biquad Filter Register (Default = All-Pass)

DESCRIPTION

INITIALIZATION GAIN COEFFICIENT VALUE

DESCRIPTION

DECIMAL

HEX

bo Coefficient

u(31:28), b0(27:24), b0(23:16), b0(15:8), b0(7:0)

1.0

0x00, 0x80, 0x00, 0x00

b1 Coefficient

u(31:28), b1(27:24), b1(23:16), b1(15:8), b1(7:0)

0.0

0x00, 0x00, 0x00, 0x00

b2 Coefficient

u(31:28), b2(27:24), b2(23:16), b2(15:8), b2(7:0)

0.0

0x00, 0x00, 0x00, 0x00

a1 Coefficient

u(31:28), a1(27:24), a1(23:16), a1(15:8), a1(7:0)

0.0

0x00, 0x00, 0x00, 0x00

a2 Coefficient

u(31:28), a2(27:24), a2(23:16), a2(15:8), a2(7:0)

0.0

0x00, 0x00, 0x00, 0x00

1.7

Bass and Treble Controls

From 32-kHz to 96-kHz data, the TAS5504 has four Bass and Treble tone controls. Each control has a ±18-dB

control range with selectable corner frequencies and 2nd order slopes. These controls operate four channel

groups:

•

L, R & C (Channels 1, 2, and 3)

•

Sub (Channel 4)

For 176.4 kHz and 192 kHz data, the TAS5504 has two Bass and Treble tone controls. Each control has a

±18-dB I2C control range with selectable corner frequencies and 2nd order slopes. These controls operate

two channel groups:

•

L & R

•

Sub

The bass and treble filters utilize a soft update rate that does not produce artifacts during adjustment.

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