Texas Instruments TLV320AIC3107EVM-K quick start DAC Controls, Line Output Mixers

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The DAC/Line Outputs tab controls the DAC power and volume, as well as routing of digital data to the DACs and the analog line output from the DACs. (See Figure 26.)

4.10.1DAC Controls

On the left side of this tab are controls for the left and right DACs.

In similar fashion as the ADC, the DAC controls are set up to allow powering of each DAC individually and setting the output level. Each channel's level can be set independently using the corresponding Volume knob. Alternately, by checking the Slave to Right box, the left-channel Volume can be made to track the right-channel Volume knob setting; checking the Slave to Left box causes the right-channel Volume knob to track the left-channel Volume knob setting.

Data going to the DACs is selected using the drop-down boxes under the Left and Right DAC Datapath. Each DAC channel can be selected to be off, use left-channel data, use right-channel data, or use a mono mix of the left and right data.

Analog audio coming from the DACs is routed to outputs using the Output Path controls in each DAC control panel. The DAC output can be mixed with the analog inputs (LINE2L, LINE2R, PGA_L, PGA_R) and routed to the Line or High Power outputs using the mixer controls for these outputs on this tab (for the line outputs) or on the High Power Outputs tab (for the high power outputs). If the DAC is to be routed directly to either the Line or HP outputs, these can be selected as choices in the Output Path control. Note that if the Line or HP outputs are selected as the Output Path, the mixer controls on this tab and the High Power Output tabs have no effect.

4.10.2Line Output Mixers

On the right side of this tab are horizontal panels where the analog output mixing functions for the line outputs are located.

Each line output master volume is controlled by the knob at the far right of these panels, below the line output labels. The output amplifier gain can be muted or set at a value between 0 and 9 dB in 1-dB steps. Power/Enabled status for the line output can also be controlled using the button below this master output knob (Powered Up).

If the DAC Output Path control is set to Mix with Analog Inputs, the six knobs in each panel can be used to set the individual level of signals routed and mixed to the line output. LINE2L, LINE2R, PGA_L, PGA_R, and DAC_L and DAC_R levels can each be set to create a custom mix of signals presented to that particular line output. Note: if the DAC Output Path control is set to anything other than Mix with Analog Inputs, these controls have no effect.

SLAU261–November 2008 TLV320AIC3107EVM-K 27

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