Datasheet

TLV320AIC3100

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SLAS667A –NOVEMBER 2009–REVISED MAY 2012

Table 5-20. ADC FIR Filter Coefficients (continued)

Default (Reset) Values – Not Valid for the FIR Filter – Must Be

Filter Coefficient FIlter Coefficient RAM Location

Reprogrammed by User

FIR12 Page 4 / register 38 and page 4 / register 39 0x0000

FIR13 Page 4 / register 40 and page 4 / register 41 0x0000

FIR14 Page 4 / register 42 and page 4 / register 43 0x0000

FIR15 Page 4 / register 44 and page 4 / register 45 0x7FFF (decimal 1.0 – LSB value)

FIR16 Page 4 / register 46 and page 4 / register 47 0x0000

FIR17 Page 4 / register 48 and page 4 / register 49 0x0000

FIR18 Page 4 / register 50 and page 4 / register 51 0x0000

FIR19 Page 4 / registe 52 and page 4 / register 53 0x0000

FIR20 Page 4 / register 54 and page 4 / register 55 0x7FFF (decimal 1.0 – LSB value)

FIR21 Page 4 / register 56 and page 4 / register 57 0x0000

FIR22 Page 4 / register 58 and page 4 / register 59 0x0000

FIR23 Page 4 / register 60 and page 4 / register 61 0x0000

FIR24 Page 4 / register 62 and page 4 / register 63 0x0000

5.4.4.4 ADC Digital Decimation Filter Characteristics

The TLV320AIC3100 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

to the final output sampling rate of f

. 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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