Le58083
Data Sheet
The coefficient for the GX filter is defined as:
HGX = (1 + (C10 • 2–m10(1 + C20 • 2–m20(1 + C30 • 2–m30(1 + C40 • 2–m40)))))
Power Up and Hardware Reset (RST) Value = A9F0h, (HGX = 1.995, or +6 dB)
Note:
The default value is contained in a ROM register separate from the programmable coefficient RAM. There is a filter enable bit in Operating Func-
tions Register to switch between the default and programmed values.
COP 3. Write/Read GR Filter Coefficients
GCI Command
(82/83h)
R/W = 0: Write
R/W = 1: Read
D7
D6
0
D5
D4
0
D3
D2
0
D1
D0
Command
1
0
0
1
W/R
Coefficient Byte 1
Coefficient Byte 2
C40
C20
m40
m20
C30
C10
m30
m10
Cxy = 0 or 1 in the command above corresponds to Cxy = +1 or −1, respectively, in the equation below.
The coefficient for the GR filter is defined as:
HGR = (C10 • 2–m10(1 + C20 • 2–m20(1 + C30 • 2–m30(1 + C40 • 2–m40))))
Power Up and Hardware Reset (RST) Value = 23A1h, (HGR = 0.35547, or –8.984 dB)
See note under COP Command 2.
COP 4. Write/Read Z Filter FIR Coefficients
GCI Command
(98/99h)
R/W = 1: Read
R/W = 0: Write
This command writes and reads only the FIR portion of the Z filter without affecting the IIR.
D7
D6
0
D5
D4
1
D3
D2
0
D1
D0
Command
1
0
1
0
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
C40
C20
C41
C21
C42
C22
C43
C23
C44
C24
m40
m20
m41
m21
m42
m22
m43
m23
m44
m24
C30
C10
C31
C11
C32
C12
C33
C13
C34
C14
m30
m10
m31
m11
m32
m12
m33
m13
m34
m14
Cxy = 0 or 1 in the command above corresponds to Cxy = +1 or −1, respectively, in the equation below.
81
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