Texas Instruments TLV320AIC34EVM-K, User Manual, Page: 29 / 46

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4.10 Output Stage Configuration Tab
TLV320AIC34EVM Software
Figure 24. Output Stage Configuration Tab
The Output Stage Configuration tab ( Figure 24 ) allows for setting various features of the output drivers.
The Configuration control may be set as either Fully-Differential or Pseudo-Differential . This control is
used to determine if the output stage is being used to drive a fully differential output load or a output load
where one of the outputs if referenced to a common-mode voltage (pseudo-differential).
The output Coupling control can be chosen as either Capless or AC-coupled . This setting should
correspond to the setting of the hardware switch (SW1) on the TLV320AIC34EVM.
The common mode voltage of the outputs may be set to 1.35V, 1.5V, 1.65V, or 1.8V using the Common
Mode Voltage control.
The TLV320AIC34 offers several options to help reduce the turn-on/off pop of the output amplifiers. The
Power-On Delay of the output drivers can be set using the corresponding control from 0's up to 4
seconds. Ramp-Up Step Timing can also be adjusted from 0ms to 4ms. The outputs can be set to
soft-step their volume changes, using the Output Volume Soft Stepping control, and set to step once per
Fs period, once per two Fs periods, or soft-stepping can be disabled altogether.
The high power outputs of the TLV320AIC34 can be configured to go to a weak common-mode voltage
when powered down. The source of this weak common-mode voltage can be set on this tab with the
Weak Output CM Voltage Source drop-down. Choices for the source are either a resistor divider off the
AVDD_DAC supply, or a bandgap reference. See the data sheet for more details on this option.
SLAU232 – December 2007 TLV320AIC34EVM-K 29
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