ISL5216_07 Datasheet, PDF (59/65 Pages) Intersil Corporation – Four-Channel Programmable Digital Downconverter

ISL5216
DECIMATING
HALFBAND #1
(DHBF #1, 7-TAP)
TABLE 52. DECIMATING HALFBAND FIR FILTER COEFFICIENTS
DECIMATING
HALFBAND #2
(DHBF #2, 11-TAP)
DECIMATING
HALFBAND #3
(DHBF #3, 15-TAP)
DECIMATING
HALFBAND #4
(DHBF #4, 19-TAP)
DECIMATING
HALFBAND #5
(DHBF #1, 23-TAP)
COEFF HEX
DECIMAL
HEX
DECIMAL
HEX
DECIMAL
HEX
DECIMAL
HEX
DECIMAL
C0 FBFE40 - 0.031303406 00C250 0.005929947 FFD538 -0.00130558 000C68 0.000378609 FFF4A0 -0.000347137
C1 000000 0.000000000 000000 0.000000000 000000 0.000000000 000000 0.000000000 000000 0.000000000
C2 240100 0.281280518 F9B930 -0.049036026 0195A8 0.012379646 FF8320 -0.003810883 005258 0.00251293
C3 3FFE80 0.499954224 000000 0.000000000 000000 0.000000000 000000 0.000000000 000000 0.000000000
C4 240100 0.281280518 258400 0.29309082 F83FE0 -0.06055069 0276A0 0.019245148 FEB320 -0.010158539
C5 000000 0.000000000 3FFF00 0.499969482 000000 0.000000000 000000 0.000000000 000000 0.000000000
C6 FBFE40 - 0.031303406 258400 0.29309082 265480 0.299453735 F70D60 -0.069904327 03E920 0.03055191
C7
000000 0.000000000 3FFE80 0.499954224 000000 0.000000000 000000 0.000000000
C8
F9B930 -0.049036026 265480 0.299453735 26EC80 0.304092407 F581A0 -0.081981659
C9
000000 0.000000000 000000 0.000000000 400000 0.500000000 000000 0.000000000
C10
00C250 0.005929947 F83FE0 -0.06055069 26EC80 0.304092407 279B00 0.309417725
C11
000000 0.000000000 000000 0.000000000 400000 0.500000000
C12
0195A8 0.012379646 F70D60 -0.069904327 279B00 0.309417725
C13
000000 0.000000000 000000 0.000000000 000000 0.000000000
C14
FFD538 -0.00130558 0276A0 0.019245148 F581A0 -0.081981659
C15
000000 0.000000000 000000 0.000000000
C16
FF8320 -0.003810883 03E920 0.03055191
C17
000000 0.000000000 000000 0.000000000
C18
000C68 0.000378609 FEB320 -0.010158539
C19
000000 0.000000000
C20
005258 0.00251293
C21
000000 0.000000000
C22
FFF4A0 -0.000347137
NOTES:
26. Decimating Halfband Filter #4 Coefficients are shown for reference only. If it is desired to implement this FIR filter, these coefficients would have
to be loaded into the FIR Coefficient RAM (They are not included in the ROMd Fir Filter Coefficient memory).
27. The 22-bit ROMd FIR filter coefficients are located in the upper 22 bits of the Read register when read back from ROM memory (except for
Halfband #4). These bits occupy the upper six bytes (24 bits) with the two LSBs of the lower byte (bits 9:8 of 31:0) being zero. The decimal value
for the hexadecimal coefficient is calculated by first converting the hexadecimal value to decimal and the dividing by 2²³ (8388608).
59
FN6013.3
July 13, 2007