Datasheet

Decimation Filter
TLV320ADC3101
www.ti.com ...................................................................................................................................... SLAS553A – NOVEMBER 2008 – REVISED SEPTEMBER 2009
Table 9. ADC FIR Filter Coefficients (continued)
Filter Coefficient ADC Coefficient, Left Channel ADC Coefficient, Right Channel
FIR17 C24 (page 4 / register 48, page 4 / register 49) C56 (page 4 / register 112, page 4 / register 113)
FIR18 C25 (page 4 / register 50, page 4 / register 51) C57 (page 4 / register 114, page 4 / register 115)
FIR19 C26 (page 4 / register 52, page 4 / register 53) C58 (page 4 / register 116, page 4 / register 117)
FIR20 C27 (page 4 / register 54, page 4 / register 55) C59 (page 4 / register 118, page 4 / register 119)
FIR21 C28 (page 4 / register 56, page 4 / register 57) C60 (page 4 / register 120, page 4 / register 121)
FIR22 C29 (page 4 / register 58, page 4 / register 59) C61 (page 4 / register 122, page 4 / register 123)
FIR23 C30 (page 4 / register 60, page 4 / register 61) C62 (page 4 / register 124, page 4 / register 125)
FIR24 C31 (page 4 / register 62, page 4 / register 63) C63 (page 4 / register 126, page 4 / register 127)
The TLV320ADC3101 offers three different types of decimation filters. The integrated digital decimation filter
removes high-frequency content and downsamples the audio data from an initial sampling rate of AOSR × f
S
to
the final output sampling rate of f
S
. The decimation filtering is achieved using a higher-order CIC filter followed by
linear-phase FIR filters. The decimation filter cannot be chosen by itself; it is implicitly set through the chosen
processing block.
The following subsections describe the properties of the available filters A, B, and C.
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