Gain=0, –1.5, –3,..., –12dB,Mute
Gain=0, –1.5, –3,..., –12dB,Mute
ToLeft ADCPGA
B0156-04
LINE2LP_x
MIC3L_x
Gain=0, –1.5, –3,..., –12dB,Mute
LINE1LP_x
MIC3R_x
Gain=0, –1.5, –3,..., –12dB,Mute
Gain=0, –1.5, –3,..., –12dB,Mute
LINE1RP_x
ANALOG INPUT BYPASS PATH FUNCTIONALITY
TLV320AIC34
SLAS538A – OCTOBER 2007 – REVISED NOVEMBER 2007
Three fully-differential analog inputs can similarly be mixed into each partition's right-ADC PGA as well,
consisting of LINE1RP_x, LINE1RM_x, LINE2RP_x, LINE2RM_x, LINE1LP_x, and LINE1LM_x. Note that it is
not necessary to mix all three 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 multiplexing 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 in the same partition. However, it is possible for an input to be selected or mixed into both left- and
right-channel PGAs of the same partition, as long as it has the same configuration for both channels (either both
single-ended or both fully differential).
Figure 31 shows the single-ended mixing configuration for one partition's left-channel ADC PGA, which enables
mixing of the signals LINE1LP_x, LINE2LP_x, LINE1RP_x, MIC3L_x, and MIC3R_x. The right-channel ADC
PGA mix is similar, enabling mixing of the signals LINE1RP_x, LINE2RP_x, LINE1LP_x, MIC3L_x, and
MIC3R_x.
Figure 31. Left-Channel Single-Ended Analog Input Mixing Configuration
The TLV320AIC34 includes the additional ability to route some analog input signals past the integrated data
converters, for mixing with other analog signals and then direct connection to the output drivers. This capability is
useful in a cell phone, for example, when a separate FM radio device provides a stereo analog output signal that
must be routed to headphones. The TLV320AIC34 supports this in a low-power mode by providing a direct
analog path through the device to the output drivers, while all ADCs and DACs can be completely powered down
to save power.
For fully differential inputs, the TLV320AIC34 provides the ability to pass the signals LINE1LP_x, LINE1LM_x,
LINE1RP_x, and LINE1RM_x of each partition directly to the output stage of the same partition. If in single-ended
configuration, the device can pass the signal LINE1LP_x and LINE1RP_x to the output stage directly.
42 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): TLV320AIC34
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