Datasheet

GAIN = 0, −1.5, −3, . . . −12 dB, Mute
GAIN = 0, −1.5, −3, . . . −12 dB, Mute
To Left ADC
PGA
LINE1 LP
LINE1 LM
LINE1 RP
LINE1 RM
GAIN = 0, −1.5, −3, . . ., −12 dB, Mute
GAIN = 0, −1.5, −3, . . ., −12 dB, Mute
To Left ADC
PGA
IN1 RP
IN2 L
GAIN = 0, −1.5, −3, . . ., −12 dB, Mute
IN1 LP
IN2 R
GAIN = 0, −1.5, −3, . . ., −12 dB, Mute
TLV320AIC31
www.ti.com ............................................................................................................................................. SLAS497C – AUGUST 2006 – REVISED DECEMBER 2008
Figure 27. Left Channel Fully-Differential Analog Mixing Capability
Two fully-differential analog inputs can similarly be mixed into the right ADC PGA as well, consisting of
IN1RP-IN1RM and IN1LP-IN1LM. Note that it is not necessary to mix both fully-differential signals if this is not
desired — unnecessary inputs can simply be muted using the input level control registers.
Inputs can also be selected as single-ended instead of fully-differential, and mixing or muxing into the ADC PGAs
is also possible in this mode. It is not possible, however, for an input pair to be selected as fully-differential for
connection to one ADC PGA and simultaneously selected as single-ended for connection to the other ADC PGA
channel. However, it is possible for an input to be selected or mixed into both left and right channel PGAs, as
long as it has the same configuration for both channels (either both single-ended or both fully-differential).
Figure 28 shows the single-ended mixing configuration for the left channel ADC PGA, which enables mixing of
the signals IN11LP, IN1RP, IN2L, and IN2R. The right channel ADC PGA mix is similar, enabling mixing of the
signals IN11LP, IN1RP, IN2L, and IN2R.
Figure 28. Left Channel Single-Ended Analog Input Mixing Configuration
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