TAS5558 datasheet(30/122 Pages) TI

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0.707 C 0.707 Ls 0.707 Rs

L _ out

3.121

0.707 C 0.707 Ls 0.707 Rs

R _ out

3.121

L _ out

E3 L E4 C E7 Ls E8 Rs

R _ out

E3 R E4 C E5 Ls E6 Rs

LEFT

RIGHT

CENTER

RIGHT

OUT

SDIN1

COEF

0XE3

DOLBY

DOWN

MIX

COEF

0XE4

COEF

0XE5

COEF

0XE6

COEF

0XE8

COEF

0XE7

SDIN4

SDIN2

LEFT

OUT

TAS5558

SLES273A – APRIL 2013 – REVISED JUNE 2013

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3.10 Downmix Algorithm and I2S Out

Figure 3-17. Dolby Downmix

The TAS5558 has an excellent feature that can mix the input signals to create a downmix to make the I2S

serial output which has an SRC that keeps output sample rate at 48KHz irrespective of input sample rate.

Downmix registers are defined as follows:

0xE3 == Coefficient for L and R channels

0xE4 == Coefficient for Center channel

0xE5 == Coefficient for LS for R_out

0xE6 == Coefficient for Rs for R_out

0xE7 == Coefficient for Ls for L_out

0xE8 == Coefficient for Rs for L_out

L, R, C, Ls, Rs are input cross bar mixer outputs. L, R, C, Ls, Rs are defined as the output of input

mixers. L = Ch1, R = Ch2, C = Ch8, Ls = Ch3, Rs = Ch4, use input mixer to mix any other channels to

I2S Out.

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Input Mixers also can be used as other mixers to mix subwoofer channels to I2S out.

By default I2S out has the following values:

test

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TAS5558 DAP Architecture

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