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Filter Coefficients for AFE 5809

Duncan Hurst
Prodigy 130 points
Other Parts Discussed in Thread: AFE5809

Hi TI people,

Can you help us design a set of filter coefficients to program into our AFE5809's Filter Coefficient RAM?

If possible, can you provide the coefficients for 32/16=2Mhz, 32/32 =1MHz and 32/64=0.5 MHz LPF filter frequency (Anti-aliasing band is half of sampling frequency).

Will I need three profiles in Profile RAM to point to these three sets of Coefficients?

If you need any more information from us, please just ask.

Thanks,

Duncan Hurst

  • 0
    TI__Expert 6320 points
    Duncan,
    Yes, please give me a few days to gather this together. Is that decimation of 32? Which Fsampling?
    The Profile is not required to point to the desired coefficient block, but is a convenient way to switch DEMOD configurations quickly, including coefficient pointer.
  • 0 in reply to Chuck Smyth
    Prodigy 130 points
    Hi Chuck,

    Our equipment has a fixed Fsampling, fs=32 MHz. We then have three demodulator decimation options:

    1) M=8
    2) M=16
    3) M=32

    So I guess you need to generate 3 sets of filter coefficients for these 3 options.

    Thanks in advance,
    Duncan
  • 0 in reply to Duncan Hurst
    Prodigy 130 points

    Hi Chuck,

    Is there any movement on this?

    We are getting very close to needing a fully-operational AFE in our development lifecycle.

    Thanks,

    Duncan

  • 0 in reply to Duncan Hurst
    TI__Expert 6320 points

    Filter Coefficient M=8.txt 
    0FEFFC6006BFF10023FFC000BFFF
0F1BF6F011BFD9005BFF50017FFD
0D8BF3E0183FCA007BFF0001FFFD
0B5FF3101A7FC50087FEF0023FFC
08CFF45018BFC9007BFF1001FFFC
0613F6F0137FD40063FF40017FFD
036BFA700C3FE5003FFF9000FFFE
010BFE30043FF70017FFE0007FFF
    Filter Coefficient M=16.txt 
    0803FF1001FFFC000BFFF0004000
07E7FD6004FFF5001BFFD000BFFF
07B3FC1007BFEF0027FFB000BFFF
0767FAF009FFEA0033FFA000FFFF
06FFFA300BBFE6003BFF80013FFE
0687F9C00CBFE40043FF80013FFE
05FBF9900D3FE20043FF70013FFE
0563F9A00D7FE20043FF80013FFE
04BFF9F00CFFE30043FF80013FFE
0413FA700BFFE5003FFF9000FFFE
0363FB100ABFE80037FF9000FFFE
02B3FBE008FFEC002FFFA000FFFF
020BFCC0073FF00027FFC000BFFF
0167FDB0053FF5001BFFD0007FFF
00CFFEA0033FF90013FFE0004000
0043FF90013FFE0007FFF0000000
    Filter Coefficient M=32.txt 
    0403FFC000BFFF00040000000000
03FFFF50017FFD000BFFF0000000
03FBFEE0023FFB000FFFF0004000
03EFFE8002FFFA000FFFE0004000
03E3FE3003BFF80013FFE0007FFF
03D3FDE0043FF70017FFD0007FFF
03BFFDA004BFF6001BFFD0007FFF
03A7FD60053FF5001BFFD000BFFF
038FFD3005BFF4001FFFC000BFFF
0373FD00063FF3001FFFC000BFFF
0357FCF0067FF20023FFC000BFFF
0333FCD006BFF20023FFC000BFFF
0313FCC006BFF10023FFC000BFFF
02EFFCC006BFF10023FFC000BFFF
02C7FCC006BFF10023FFC000BFFF
029FFCD006BFF10023FFC000BFFF
0277FCE006BFF10023FFC000BFFF
024BFD00067FF20023FFC000BFFF
021FFD20063FF20023FFC000BFFF
01F3FD5005FFF3001FFFC000BFFF
01CBFD7005BFF4001FFFD000BFFF
019FFDA0053FF5001BFFD0007FFF
0173FDD004FFF6001BFFD0007FFF
0147FE10047FF60017FFD0007FFF
011BFE4003FFF80017FFE0007FFF
00F3FE80037FF90013FFE0007FFF
00C7FEC002FFFA000FFFE0004000
00A3FEF0027FFB000FFFF0004000
007BFF3001FFFC000BFFF0000000
0057FF70017FFD000BFFF0000000
0033FFB000FFFE00040000000000
0013FFE0007FFF00000000000000

    Duncan, these are files used in the AFe5809 EVM.  The format for every row is 112 bits, and each nibble( 4 bits) is interpreted as a hexidecimal number.  Let me know if you need more help.

  • 0 in reply to Chuck Smyth
    Prodigy 130 points

    Thanks Chuck. I'll try these values.

    Duncan