4.11 HP Output Stage Configuration Tab
TLV320AIC3107EVM Software
www.ti.com
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-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 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
µ
s up to 4
µ
s.
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.
TLV320AIC3107EVM-K
28
SLAU261 – November 2008
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