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TLV320AIC3105 Fiches technique(PDF) 32 Page - Texas Instruments |
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TLV320AIC3105 Fiches technique(HTML) 32 Page - Texas Instruments |
32 / 103 page TLV320AIC3105 SLAS513C – FEBRUARY 2007 – REVISED DECEMBER 2014 www.ti.com Table 4. Appropriate Settings CM SETTING RECOMMENDED AVDD, DRVDD RECOMMENDED DVDD 1.35 2.7 V–3.6 V 1.525 V–1.95 V 1.5 3 V–3.6 V 1.65 V–1.95 V 1.65 V 3.3 V–3.6 V 1.8 V–1.95 V 1.8 V 3.6 V 1.95 V 10.3.3.3.7 Audio DAC Power Control 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. 10.3.4 Audio Analog Inputs The TLV320AIC3105 includes six single-ended audio inputs. These 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. 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 2 Vp-p (single-ended). 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 TLV320AIC3105 includes input level control on each of the individual inputs before they are mixed or muxed into the ADC PGAs, with gain programmable from 0 dB to –12 dB in 1.5-dB 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. Figure 21 shows the single-ended mixing configuration for the left-channel ADC PGA, which enables mixing of the signals LINE1L, LINE2L, LINE1R, MIC3L, and MIC3R. The right channel ADC PGA mix is similar, enabling mixing of the signals LINE1R, LINE2R, LINE1L, MIC3L, and MIC3R. 32 Submit Documentation Feedback Copyright © 2007–2014, Texas Instruments Incorporated Product Folder Links: TLV320AIC3105 |
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