TAS5548DCAR datasheet(35/116 Pages) TI1

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TAS5548

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SLES270A – NOVEMBER 2012 – REVISED APRIL 2015

Figure 33. 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 TAS5548. Registers 0x51–0x88 show all the biquads in

the TAS5548. Note that u[31:28] bits are unused and default to 0x0.

Table 7. Contents of One 20-Byte Biquad Filter Register (Default = All-Pass)

INITIALIZATION GAIN COEFFICIENT VALUE

DESCRIPTION

DECIMAL

HEX

b0 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

7.4.13 Bass and Treble Controls

In post-SRC 96kHz processing mode, the TAS5548 has four bass and treble tone control groups. Each control

has a ±18-dB control range with selectable corner frequencies and second-order slopes. These controls operate

four channel groups:

•

L, R, and C (channels 1, 2, and 7)

•

LS, RS (channels 3 and 4)

•

LBS, RBS (alternatively called L and R lineout) (channels 5 and 6)

•

Sub (channel 8)

For post-SRC 192-kHz data, the TAS5548 has two bass and treble tone controls. Each control has a ±18-dB I2C

control range with selectable corner frequencies and second-order slopes. These controls operate two channel

groups:

•

L, R and C

•

Sub

–

Sub only has bass and no treble.

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

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