ZHCSGM5A August 2017 – November 2017 TLV320AIC3109-Q1
PRODUCTION DATA.
In applications where record-only is selected and the DAC is powered down, the playback path signal processing blocks can be used in the ADC record path. These filtering blocks can support high-pass, low-pass, band-pass, or notch filtering. In this mode, the record-only path has switches SW-D1 and SW-D2 closed, and reroutes the ADC output data through the digital signal processing blocks. Because the DAC digital signal processing blocks are being re-used, naturally the addresses of these digital filter coefficients are the same as for the DAC digital processing and are located in registers 1–26, page 1. This record-only mode is enabled by powering down the DAC by writing to bit 7 in register 37, page 0 (where bit 7 = 0). Next, enable the digital filter pathway for the ADC by writing a 1 to bit 3 in register 107, page 0. (This pathway is only enabled if the DAC is powered down.) Figure 27 shows the record-only path.