TAS5548DCAR datasheet(45/116 Pages) TI1

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GainCoefficient

Select

Output

GainCoefficient

Output

Select

Output

1,2,3,4,5,or6

GainCoefficient

Select

Output

GainCoefficient

Output

Select

Output

7or8

GainCoefficient

Select

Output

M0011-05

3dB

att

3dB

att

+ -

(

)

(

)

3dB

+ -

´ -

+ -

TAS5548

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SLES270A – NOVEMBER 2012 – REVISED APRIL 2015

where Ls and Rs are phase shifted 90°

(6)

7.4.19.2 Left Only/Right Only (Lo/Ro)

Lo/Ro is a downmix suitable when mono compatibility is required. Lo/Ro destroys front/rear channel separation

information and thus a Dolby Pro Logic upmixer will not be able to properly extract 5.1 channels again.

where att = –3 dB, –6 dB, –9 dB or 0 dB

(7)

7.4.20 Output Mixer

The TAS5548 provides an 8×2 output mixer for channels 1, 2, 3, 4, 5, and 6. For channels 7 and 8, the TAS5548

provides an 8×3 output mixer. These mixers allow each output to be any mix of any two (or three) signal-

processed channels. The control parameters for the output crossbar mixer are programmable via the I2C

interface. All of the TAS5548 features are available when the 8×2 and 8×3 output mixers are configured in the

pass-through output mixer configuration, where the audio data from each DAP channel maps directly to the

corresponding PWM channel (that is, DAP channel 1 to PWM channel 1, and so on).

When mixing or remapping DAP channels to different PWM output channels there are limitations to consider:

•

Individual channel mute should not be used.

•

The sum of the minimum channel volume and master volume should not be below –109 dB.

Figure 39. Output Mixers

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