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6.8 Output Stage Configuration Tab
Kit Operation
The Output Stage Configuration tab (Figure 13 ) allows for setting several features of the output drivers.
The Configuration may be set as either Fully-Differential or Pseudo-Differential. The output coupling can
be chosen as either capless or AC-coupled. This setting should correspond to the setting of the hardware
switch (SW1) on the TLV320DAC32EVM.
Figure 13. Output Stage Configuration Tab
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 Power-On Delay of the output drivers can be set using the corresponding
control from 0 µ s up to 4 seconds. Ramp-Up Step Timing can also be adjusted from 0ms to 4ms.
The high power outputs of the TLV320DAC32 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.
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.
Output short-circuit protection can be enabled in the Short Circuit Protection group box. Short Circuit
Protection can use a current-limit mode, where the drivers will limit current output if a short-circuit
condition is detected, or in a mode where the drivers will power down when such a condition exists.
The LINE2 Bypass Path group box has controls that allow disabling or routing the LINE2 input to the
output stage directly.
TLV320DAC32EVM and TLV320DAC32EVM-PDK20 SLAU201 – November 2006
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