2
2
1
1
23
2
2
1
1
0
z
D
z
D
*
2
2
z
N
z
N
*
2
N
)
z
(
H
-
-
-
-
-
-
+
+
=
1
1
23
1
1
0
z
D
2
z
N
N
)
z
(
H
-
-
-
+
=
DAC
The coefficients of the available filters are arranged as sequentially-indexed coefficients in two banks. If
adaptive filtering is chosen, the coefficient banks can be switched on-the-fly. For more details on adaptive
filtering please see
The coefficients of these filters are each 24-bits wide, in two's-complement and occupy 3 consecutive 8-bit
registers in the register space. For default values please see the default values tables in the Register Map
section.
2.4.2.1
1st-Order IIR Section
The IIR is of first-order and its transfer function is given by
(9)
The frequency response for the 1
st
order IIR Section with default coefficients is flat. Details on DAC
coefficient default values are given in
Table 2-14. DAC IIR Filter Coefficients
Filter
Filter Coefficient
ADC Coefficient Left Channel
ADC Coefficient Right
Channel
1
st
Order IIR
N0
C65 (Page 46 / Registers
C68 (Page 46 / Registers
28,29,30)
40,41,42)
N1
C66 (Page 46 / Registers
C69 (Page 46 / Registers
32,33,34)
44,45,46)
D1
C67 (Page 46 / Registers
V70 (Page 46 / Registers
36,37,38)
48,49,50)
2.4.2.2
Biquad Section
The transfer function of each of the Biquad Filters is given by
(10)
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
Table 2-15. DAC Biquad Filter Coefficients
Filter
Coefficient
Left DAC Channel
Right DAC Channel
BIQUAD A
N0
C1 (Page 44 / Registers 12,13,14)
C33 (Page 45 / Registers 20,21,22)
N1
C2 (Page 44 / Registers 16,17,18)
C34 (Page 45 / Registers 24,25,26)
N2
C3 (Page 44 / Registers 20,21,22)
C35 (Page 45 / Registers 28,29,30)
D1
C4 (Page 44 / Registers 24,25,26)
C36 (Page 45 / Registers 32,33,34)
D2
C5 (Page 44 / Registers 28,29,30)
C37 (Page 45 / Registers 36,37,38)
BIQUAD B
N0
C6 (Page 44 / Registers 32,33,34)
C38 (Page 45 / Registers 40,41,42)
N1
C7 (Page 44 / Registers 36,37,38)
C39 (Page 45 / Registers 44,45,46)
N2
C8 (Page 44 / Registers 40,41,42)
C40 (Page 45 / Registers 48,49,50)
D1
C9 (Page 44 / Registers 44,45,46)
C41 (Page 45 / Registers 52,53,54)
D2
C10 (Page 44 / Registers 48,49,50)
C42 (Page 45 / Registers 56,57,58)
BIQUAD C
N0
C11 (Page 44 / Registers 52,53,54)
C43 (Page 45 / Registers 60,61,62)
N1
C12 (Page 44 / Registers 56,57,58)
C44 (Page 45 / Registers 64,65,66)
N2
C13 (Page 44 / Registers 60,61,62)
C45 (Page 45 / Registers 68,69,70)
D1
C14 (Page 44 / Registers 64,65,66)
C46 (Page 45 / Registers 72,73,74)
D2
C15 (Page 44 / Registers 68,69,70)
C47 (Page 45 / Registers 76,77,78)
BIQUAD D
N0
C16 (Page 44 / Registers 72,73,74)
C48 (Page 45 / Registers 80,81,82)
40
TLV320DAC3203 Application
SLAU434 – May 2012
Copyright © 2012, Texas Instruments Incorporated