TV Converter Box User Manual

4.8 AGC Tab
TLV320AIC3007EVM Software www.ti.com
Figure 11. AGC Tab
The AGC tab (see Figure 11 ) consists of two identical sets of controls, one for the left channel and the
other for the right channel. The AGC function is described in the TLV320AIC3007 data sheet.
The AGC can be enabled for each channel using the Enable AGC button. Target gain, Attack time in
milliseconds, Decay time in milliseconds, and the Maximum PGA Gain Allowed can all be set,
respectively, using the four corresponding knobs in each channel.
The TLV320AIC3007 allows for the Attack and Decay times of the AGC to be setup in two different
modes, standard and advanced. The Left/Right AGC Settings button determines the mode selection.
The Standard mode provides several preset times that can be selected by adjustments made to the
Attackand Decay knobs. If finer control over the times is required, then the Advanced mode is selected to
change to the settings. When the Advanced mode is enabled, two tabs appear that allow separate,
advanced control of the Attack and Delay times of the AGC (see Figure 12 and Figure 13 ). These options
allow selection of the base time as well as a multiplier to achieve the actual times shown in the
corresponding text box. The Use advanced settings? button must be enabled to program the registers
with the correct values selected via the pulldown options for base time and multiplier.
18 TLV320AIC3007EVM-K SLAU286 – June 2009
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