TLV320AIC3268_15 Datasheet, PDF (60/263 Pages) Texas Instruments – TLV320AIC3268 Low Power Stereo Audio Codec With 105dB DAC, DirectPath Headphone and Class-D Speaker Amplifier and Integrated miniDSP

TLV320AIC3268
SLAS953A – JANUARY 2014 – REVISED FEBRUARY 2014
www.ti.com
8.3.3.3.2 Biquad Section
The transfer function of each of the Biquad Filters is given by
H(z)
=
N₀
2²³
+ 2 * N₁z ^-1 + N₂z ^-2
- 2 * D₁z ^-1 - D₂z ^-2
(8)
The frequency response for each biquad section with default coefficients is flat at a gain of 0dB. Details on DAC
coefficient default values are given in DAC Defaults.
Filter
BIQUAD A
BIQUAD B
BIQUAD C
BIQUAD D
BIQUAD E
BIQUAD F
Coefficient
N0
N1
N2
D1
D2
N0
N1
N2
D1
D2
N0
N1
N2
D1
D2
N0
N1
N2
D1
D2
N0
N1
N2
D1
D2
N0
N1
N2
D1
D2
Table 20. DAC Biquad Filter Coefficients
Left DAC Channel
C4 (B80_P1_R24-R26)
C5 (B80_P1_R28-R30)
C6 (B80_P1_R32-R34)
C7 (B80_P1_R36-R38)
C8 (B80_P1_R40-R42)
C9 (B80_P1_R44-R46)
C10 (B80_P1_R48-R50)
C11 (B80_P1_R52-R54)
C12 (B80_P1_R56-R58)
C13 (B80_P1_R60-R62)
C14 (B80_P1_R64-R66)
C15 (B80_P1_R68-R70)
C16 (B80_P1_R72-R74)
C17 (B80_P1_R76-R78)
C18 (B80_P1_R80-R82)
C19 (B80_P1_R84-R86)
C20 (B80_P1_R88-R90)
C21 (B80_P1_R92-R94)
C22 (B80_P1_R96-R98)
C23 (B80_P1_R100-R102)
C24 (B80_P1_R104-R106)
C25 (B80_P1_R108-R110)
C26 (B80_P1_R112-R114)
C27 (B80_P1_R116-R118)
C28 (B80_P1_R120-R122)
C29 (B80_P1_R124-R126)
C30 (B80_P2_R8-R10)
C31 (B80_P2_R12-R14)
C32 (B80_P2_R16-R18)
C33 (B80_P2_R20-R22)
Right DAC Channel
C39 (B80_P2_R44-R46)
C40 (B80_P2_R48-R50)
C41 (B80_P2_R52-R54)
C42 (B80_P2_R56-R58)
C43 (B80_P2_R60-R62)
C44 (B80_P2_R64-R66)
C45 (B80_P2_R68-R70)
C46 (B80_P2_R72-R74)
C47 (B80_P2_R76-R78)
C48 (B80_P2_R80-R82)
C49 (B80_P2_R84-R86)
C50 (B80_P2_R88-R90)
C51 (B80_P2_R92-R94)
C52 (B80_P2_R96-R98)
C53 (B80_P2_R100-R102)
C54 (B80_P2_R104-R106)
C55 (B80_P2_R108-R110)
C56 (B80_P2_R112-R114)
C57 (B80_P2_R116-R118)
C58 (B80_P2_R120-R122)
C59 (B80_P2_R124-R126)
C60 (B80_P3_R8-R10)
C61 (B80_P3_R12-R14)
C62 (B80_P3_R16-R18)
C63 (B80_P3_R20-R22)
C64 (B80_P3_R24-R26)
C65 (B80_P3_R28-R30)
C66 (B80_P3_R32-R34)
C67 (B80_P3_R36-R38)
C68 (B80_P3_R40-R42)
60
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