TLV320AIC3107EVM Software | www.ti.com |
4.11 HP Output Stage Configuration Tab
Figure 27. Output Stage Configuration Tab
The HP Output Stage Configuration tab (Figure 27) allows for setting various features of the output drivers.
The Headset Configuration control can be set as either Fully-Differentialor 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 is referenced to a common-mode voltage (pseudo-differential).
The output Coupling control can be chosen as either Capless, that is capacitor less, (EVM SW2-CAPLESS) or AC-coupled(EVM SW2-CAP). This setting corresponds to the setting of the hardware switch (SW2) on the TLV320AIC3107EVM.
The common-mode voltage of the outputs can be set to 1.35V, 1.5V, 1.65V, or 1.8V using the Common Mode Voltage control.
The TLV320AIC3107 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 μs up to 4 μs. Ramp-Up Step Timing also can be adjusted from 0 ms to 4 ms. 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 TLV320AIC3107 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 menu. 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.
Headset detection features are enabled using the Enable button in the HP Headset Detection groupbox. When enabled, the indicators in the HS/Button Detect groupbox illuminate when either a button press or headset is detected. When a headset is detected, the type of headset is displayed in the Detection Type indicator. Debounce times for detection are set using the Jack Detect Debounce and Button Press Debounce controls, which offer debounce times in varying numbers of milliseconds. See the TLV320AIC3107 data sheet for a discussion of headset detection.
Output short-circuit protection can be enabled in the HP Short Circuit Protection groupbox. Short Circuit Protection can use a current-limit mode, where the drivers limit current output if a short-circuit condition is detected, or in a mode where the drivers power down when such a condition exists.
28 | TLV320AIC3107EVM-K | SLAU261–November 2008 |
