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TLV320AIC31 Datasheet(PDF) 29 Page - Burr-Brown (TI) |
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TLV320AIC31 Datasheet(HTML) 29 Page - Burr-Brown (TI) |
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29 / 77 page  www.ti.com AUDIO DAC POWER CONTROL AUDIO ANALOG INPUTS 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 TLV320AIC31 SLAS497A – AUGUST 2006 – REVISED SEPTERMBER 2006 The stereo DAC can be fully powered up or down, and in addition, the analog circuitry in each DAC channel can be powered up or down independently. This provides power savings when only a mono playback stream is needed. The TLV320AIC31 includes six analog audio input pins, which can be configured as two fully-differential pair plus one single-ended pair of audio inputs, or four single-ended audio inputs. These six pins connect through series resistors and switches to the virtual ground terminals of two fully differential opamps (one per ADC/PGA channel). By selecting to turn on only one set of switches per opamp at a time, the inputs can be effectively muxed to each ADC PGA channel By selecting to turn on multiple sets of switches per opamp at a time, mixing can also be achieved. However, single-ended and fully-differential audio inputs cannot be mixed into the same ADC PGA at the same time. Mixing of multiple inputs can easily lead to PGA outputs that exceed the range of the internal opamps, resulting in saturation and clipping of the mixed output signal. Whenever mixing is being implemented, the user should take adequate precautions to avoid such a saturation case from occurring. In general, the mixed signal should not exceed 2Vp-p single-ended or 4Vp-p fully-differential. In most mixing applications, there is also a general need to adjust the levels of the individual signals being mixed. For example, if a soft signal and a large signal are to be mixed and played together, the soft signal generally should be amplified to a level comparable to the large signal before mixing. In order to accommodate this need, the TLV320AIC31 includes input level control on each of the individual inputs before they are mixed or muxed into the ADC PGAs, with gain programmable from 0dB to -12dB in 1.5dB steps. Note that this input level control is not intended to be a volume control, but instead used occasionally for level setting. Soft-stepping of the input level control settings is implemented in this device, with the speed and functionality following the settings used by the ADC PGA for soft-stepping. The TLV320AIC31 supports the ability to mix up to two fully-differential analog inputs into each ADC PGA channel. Figure 27 shows the mixing configuration for the left channel, which can mix the signals IN1LP-IN1LM and IN1RP-IN1RM. 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). 29 Submit Documentation Feedback |
Similar Part No. - TLV320AIC31_07 |
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Similar Description - TLV320AIC31_07 |
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