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4.14 High-Power Outputs Tab

TLV320AIC3104EVM Software

Figure 29. High-Power Outputs Tab

This tab contains four horizontal groupings of controls, one for each of the high power outputs. Each

output has a mixer to mix the LINE2L, LINE2R, PGA_L, PGA_R, DAC_L and DAC_R signals, assuming

that the DACs are not routed directly to the high power outputs (see Section 4.13).

At the left of each output strip is a Powered Up button that controls whether the corresponding output is

powered up or not. The When powered down button allows the outputs to be tri-stated or driven weakly

to a the output common mode voltage.

The HPxCOM outputs (HPLCOM and HPRCOM) can be used as independent output channels or can be

used as complementary signals to the HPLOUT and HPROUT outputs. In these complementary

configurations, the HPxCOM outputs can be selected as Differential of HPxOUT signals to the

corresponding outputs or may be set to be a common mode voltage (Constant VCM Out. When used in

these configurations, the Powered Up button for the HPxCOM output is disabled, as the power mode for

that output will track 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 Config

selector. Differential of HPLCOM allows the HPRCOM to be the complementary signal of HPLCOM for

driving 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 are

configured for Capless output drive, where HPLCOM is configured as Constant VCM Out. The feedback

option 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 output

amplifier gain to be muted or set from 0 to 9 dB in 1-dB steps.

TLV320AIC3104EVM and TLV320AIC3104EVM-PDK

SLAU218 – August 2007

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