Le58083
Data Sheet
The Z-transform equation for the Z filter is defined as:
z5 • z6 • z7 • z–1
Hz(z) = z0 + z1 • z–1 + z2 • z–2 + z3 • z–3 + z4 • z–4 + ------------------------------------------
1 – z7 • z–1
Sample rate = 32 kHz
For i = 0–5 and 7
zi = C1i • 2–m1i{1 + C2i • 2–m2i[1 + C3i • 2–m3i(1 + C4i • 2–m4i)]}
z6 = C16 • 2–m16{1 + C26 • 2–m26
}
Power Up and Hardware Reset (RST) Values = 0190 0190 0190 0190 0190 0190 01 0190 (Hex)
(HZ(z) = 0)
See note under COP Command 2 on page 80.
Note:
Z6 is used for IIR filter scaling only. Its value is typically greater than zero but less than or equal to one. The input to the IIR filter section is first
increased by a gain of 1/Z6, improving dynamic range and avoiding truncation limitations through processing within this filter. The IIR filter output
is then multiplied by Z6 to normalize the overall gain. Z5 is the actual IIR filter gain value defined by the programmed coefficients, but it also
includes the initial 1/Z6 gain. The theoretical effective IIR gain, without the Z6 gain and normalization, is actually Z5/Z6.
COP 5. Write/Read B1 Filter Coefficients (B-FIR)
GCI Command
(86/87h)
R/W = 1: Read
R/W = 0: Write
D7
D6
0
D5
D4
0
D3
D2
1
D1
D0
Command
1
0
0
1
R/W
I/O Data Byte 1
I/O Data Byte 2
I/O Data Byte 3
I/O Data Byte 4
I/O Data Byte 5
I/O Data Byte 6
I/O Data Byte 7
I/O Data Byte 8
I/O Data Byte 9
I/O Data Byte 10
I/O Data Byte 11
I/O Data Byte 12
I/O Data Byte 13
I/O Data Byte 14
C32
C12
C23
C34
C14
C25
C36
C16
C27
C38
C18
C29
C310
C110
m32
m12
m23
m34
m14
m25
m36
m16
m27
m38
m18
m29
m310
m110
C22
C33
C13
C24
C35
C15
C26
C37
C17
C28
C39
C19
C210
m22
m33
m13
m24
m35
m15
m26
m37
m17
m28
m39
m19
m210
RSVD
Cxy = 0 or 1 in the command above corresponds to Cxy = +1 or −1, respectively, in the equation below.
The Z-transform equation for the B filter is defined as:
B
10 • z–10
HB(z) = B2 • z–2 + … + B9 • z–9 + ------------------------------
1 – B11 • z–1
82
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