Texas Instruments TLV320AIC3107EVM-K ADC Filters, High-Pass Filter, Digital Effects Filter ADC

www.ti.com TLV320AIC3107EVM Software

4.9.1ADC Filters

4.9.1.1High-Pass Filter

Figure 15. ADC High-Pass Filters

The TLV320AIC3107 ADC provides the option of enabling a high-pass filter, which helps to reduce the effects of DC offsets in the system. The Figure 15 tab shows the options for programming various filter associated with the ADC. The high-pass filter has two modes: standard and programmable.

The standard high-pass filter option (Figure 16) allows for the selection of the high-pass filter frequency from several preset options that can be chosen with the Left ADC HP Filter and Right ADC HP Filter controls. The four options for this setting are disabled or three different corner frequencies which are based on the ADC sample rate.

Figure 16. ADC High-Pass Filter Settings

For custom filter requirements, the programmable function allows custom coefficients to achieve a different filter than provided by the preset filters. The controls for the programmable high-pass filter are located under the Programmable Filters heading. The following steps describe the process:

1.Enter the filter coefficients in the HP Filter controls near the bottom of the tab.

2.Press the Download Coefficients button to download the coefficients to the codec registers.

3.Enable the Programmable High-Pass Filters by selecting the Left ADC and Right ADC buttons.

The programmable high-pass filter is now correctly programmed and enabled. The ADC can be enabled with the high-pass filter.

4.9.1.2Digital Effects Filter - ADC

The ADC digital outputs stream can be routed through the digital effects filter in the codec to allow custom audio performance. The digital effects filter cannot operate on both the ADC or DAC at the same time. The digital effects filter operation is discussed in Section 4.9.3

SLAU261–November 2008 TLV320AIC3107EVM-K 21

Submit Documentation Feedback