Datasheet

ANALOG FULLY DIFFERENTIAL LINE OUTPUT DRIVERS
VOLUME
CONTROLS,
MIXING
LINE2L
LINE2R
PGA_L
PGA_R
DAC_L1
DAC_R1
DAC_L3
LEFT_LOP
LEFT_LOM
Gain=0dBto+9dB,
Mute
LINE2L
LINE2R
PGA_L
PGA_R
DAC_L1
DAC_R1
DAC_R3
RIGHT_LOP
RIGHT_LOM
Gain=0dBto+9dB,
Mute
DAC_L
DAC_L1
DAC_L2
DAC_L3
DAC_R
DAC_R1
DAC_R2
DAC_R3
STEREO
AUDIO
DAC
VOLUME
CONTROLS,
MIXING
TLV320AIC32
www.ti.com ............................................................................................................................................. SLAS479C – AUGUST 2005 – REVISED DECEMBER 2008
The TLV320AIC32 has two fully differential line output drivers, each capable of driving a 10-k Ω differential load.
The output stage design leading to the fully differential line output drivers is shown in Figure 31 and Figure 32 .
This design includes extensive capability to adjust signal levels independently before any mixing occurs, beyond
that already provided by the PGA gain and the DAC digital volume control.
The LINE2L/R signals refer to the signals that travel through the analog input bypass path to the output stage.
The PGA_L/R signals refer to the outputs of the ADC PGA stages that are similarly passed around the ADC to
the output stage. Note that since both left and right channel signals are routed to all output drivers, a mono mix
of any of the stereo signals can easily be obtained by setting the volume controls of both left and right channel
signals to – 6 dB and mixing them. Undesired signals can also be disconnected from the mix as well through
register control.
Figure 31. Architecture of the Output Stage Leading to the Fully Differential Line Output Drivers
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