Datasheet

Program Description
3-26
By default, the AGC is OFF and the programmable gain amplifier (PGA) on the
headset circuit is selected for the gain control, allowing analog input gain
control from 0 dB to 59.5 dB. When the AGC is OFF, moving the volume slide
on the AGC OFF subsection adjusts the PGA on the MICIN_HED path and
checking the Mute box mutes the headset input signal.
When the PGA changes from the current value to a newly programmed value,
the change rate can be controlled if the PGA Soft Stepping box is checked in
the Head/Handset MIC PGA section, where the PGA changes 0.5 dB at either
1 step per sample or one step per two samples.
When the box by AGC ON is checked, the AGC is enabled and all of the options
or settings for programming the AGC are now accessible, as shown in
Figure 3−13. Refer to the TSC 2101 data sheet for setting and using the AGC.
Figure 3−13. Audio 2 Screen With Headset AGC On
In addition to the input gain control, the headset microphone bias can be
selected. The programmable de-bounce features for the headset and button
detect can also set up in this section. Refer to data sheet for the details on the
detection and de-bounce.