Datasheet

M
n
n
n 0
H(z) FIR z
M 24 for PRB _ R6, PRB _R18
M 19 for PRB _ R12
-
=
=
=
=
å
TLV320AIC3100
SLAS667A –NOVEMBER 2009–REVISED MAY 2012 www.ti.com
Table 5-19. ADC Biquad Filter Coefficients (continued)
Filter Filter Coefficient Filter Coefficient RAM Location Default (Reset) Values
Biquad C N0 Page 4 / register 34 and page 4 / register 35 0x7FFF (decimal 1.0 – LSB value)
N1 Page 4 / register 36 and page 4 / register 37 0x0000
N2 Page 4 / register 38 and page 4 / register 39 0x0000
D1 Page 4 / register 40 and page 4 / register 41 0x0000
D2 Page 4 / register 42 and page 4 / register 43 0x0000
Biquad D N0 Page 4 / register 44 and page 4 / register 45 0x7FFF (decimal 1.0 – LSB value)
N1 Page 4 / register 46 and page 4 / register 47 0x0000
N2 Page 4 / register 48 and page 4 / register 49 0x0000
D1 Page 4 / register 50 and page 4 / register 51 0x0000
D2 Page 4 / register 52 and page 4 / register 53 0x0000
Biquad E N0 Page 4 / register 54 and page 4 / register 55 0x7FFF (decimal 1.0 – LSB value)
N1 Page 4 / register 56 and page 4 / register 57 0x0000
N2 Page 4 / register 58 and page 4 / register 59 0x0000
D1 Page 4 / register 60 and page 4 / register 61 0x0000
D2 Page 4 / register 62 and page 4 / register 63 0x0000
5.4.4.3.3 FIR Section
Three of the available ADC processing blocks offer FIR filters for signal processing. Processing block
PRB_R12 features a 20-tap FIR filter, whereas the processing blocks PRB_R6 and PRB_R18 each
feature a 25-tap FIR filter.
(3)
The coefficients of the FIR filters are 16-bit 2s-complement format (2 bytes each) and correspond to the
ADC coefficient space as listed in Table 5-20. Note that the default (reset) coefficients are not vaild for the
FIR filter. When the FIR filter is used, all applicable coefficients must be reprogrammed by the user. To
reprogram the FIR filter coefficients as an all-pass filter, write value 0x00 to page 4 / register 24, page 4 /
register 25, page 4 / register 34, page 4 / register 35, page 4 / register 44, page 4 / register 45, page 4 /
register 54, and page 4 / register 55.
Table 5-20. ADC FIR Filter Coefficients
Default (Reset) Values – Not Valid for the FIR Filter – Must Be
Filter Coefficient FIlter Coefficient RAM Location
Reprogrammed by User
FIR0 Page 4 / register 14 and page 4 / register 15 0x7FFF (decimal 1.0 – LSB value)
FIR1 Page 4 / register 16 and page 4 / register 17 0x0000
FIR2 Page 4 / register 18 and page 4 / register 19 0x0000
FIR3 Page 4 / register 20 and page 4 / register 21 0x0000
FIR4 Page 4 / register 22 and page 4 / register 23 0x0000
FIR5 Page 4 / register 24 and page 4 / register 25 0x7FFF (decimal 1.0 – LSB value)
FIR6 Page 4 / register 26 and page 4 / register 27 0x0000
FIR7 Page 4 / register 28 and page 4 / register 29 0x0000
FIR8 Page 4 / register 30 and page 4 / register 31 0x0000
FIR9 Page 4 / register 32 and page 4 / register 33 0x0000
FIR10 Page 4 / register 34 and page 4 / register 35 0x7FFF (decimal 1.0 – LSB value)
FIR11 Page 4 / register 36 and page 4 / register 37 0x0000
36 APPLICATION INFORMATION Copyright © 2009–2012, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Link(s): TLV320AIC3100