4.12 HP Outputs Tab
4.13 Class-D Output Tab
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TLV320AIC3007EVM Software
Figure 28. High Power Outputs Tab
This tab contains four horizontal groupings of controls, one for each of the high power outputs. Eachoutput has a mixer to mix the LINE2L, LINE2R, PGA_L, PGA_R, DAC_L and DAC_R signals, assumingthat the DACs are not routed directly to the high power outputs (see Section 4.10 ).
At the left of each output strip is a Powered Up button that controls whether the corresponding output ispowered up or not. The When powered down button allows 3-state outputs or driven weakly to a theoutput common-mode voltage.
The HPxCOM outputs ( HPLCOM and HPRCOM) can be used as independent output channels or can beused as complementary signals to the HPLOUT and HPROUT outputs. In these complementaryconfigurations, the HPxCOM outputs can be selected as Differential of HPxOUT signals to thecorresponding outputs or can be set to be a common-mode voltage ( Constant VCM Out. When used inthese configurations, the Powered Up button for the HPxCOM output is disabled, as the power mode forthat output tracks the power status of the HPL or HPR output that the COM output is tracking.
The HPRCOM Config selector allows a couple additional options compared to the HPLCOM Configselector. Differential of HPLCOM allows the HPRCOM to be the complementary signal of HPLCOM fordriving a differential load between the HPxCOM outputs. The selector also allows Ext.Feedback/HPLCOM constant VCM as an option. This option is used when the high power outputs areconfigured for Capless output drive, where HPLCOM is configured as Constant VCM Out. The feedbackoption provides feedback to the output and lowers the output impedance of HPLCOM.
At the right side of the output strip is a master volume knob for that output, which allows the outputamplifier gain to be muted or set from 0 to 9 dB in 1-dB steps.
The integrated Class-D speaker amplifier can drive one watt into an 8- Ωload. The input to the Class-Damplifier is the same signal available at the left lineout LEFT_LOP pin. The Class-D amplifier must beenabled first and then the gain control (0 dB to +18 dB) can be used. Note that many other gains areavailable in the signal path leading up to the Class-D amplifier.
SLAU286 – June 2009 TLV320AIC3007EVM-K 29Submit Documentation Feedback