LE58QL061BVC Zarlink, LE58QL061BVC Datasheet - Page 81

• Manufacturer Part Number: LE58QL061BVC
• Description: QUAD, SLAC, PROG CODEC, 3.3V, GCI, 20 I/0, PQT44, LEAD FREE
• Manufacturer: Zarlink

COP 8. Write/Read B2 Filter Coefficients (B-IIR)
This function is described in Write/Read B1 Filter Coefficients on
Power Up and Hardware Reset (RST) Value = 0190h
(B
COP 9. Write/Read IIR Z Filter Coefficients
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 Z filter is defined as:
For i = 0–5 and 7
Power Up and Hardware Reset (RST) Values = 0190 0190 0190 0190 0190 0190 01 0190 (Hex)
See note under COP Command 2 on
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.
11
= 0)
Command
Coefficient Byte 1
Coefficient Byte 2
Command
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
GCI Command
(96/97h)
R/W = 1: Read
R/W = 0: Write
GCI Command
(9A/9B)
R/W = 0: Write
R/W = 1: Read
This command writes and reads only the IIR portion of the Z filter without affecting the FIR.
Sample rate = 32 kHz
(H
z
(z) = 0)
H
z
z
i
z ( )
=
C1i 2
=
z
page
0
•
+
z
–
m1i
1
76.
•
z
C411
C211
C45
C25
C26
C47
C27
{
z
6
D
D
1
1
1
–
7
7
=
1
+
+
C16 2
C2i 2
Zarlink Semiconductor Inc.
z
2
•
•
D
D
•
0
0
z
6
6
–
–
2
–
m2i
m16
+
z
81
[
3
1
{
m411
m211
m45
m25
m26
m47
m27
•
1
D
D
+
page
0
0
z
5
5
+
C3i 2
–
C26 2
3
+
78.
•
z
4
•
D
D
–
1
1
•
m3i
4
4
–
z
m26
–
4
(
1
+
}
+
z
------------------------------------------ -
C311
C111
C35
C15
C16
C37
C17
5
D
D
C4i 2
0
1
1 z
3
3
•
–
z
•
6
•
7
–
z
•
m4i
7
D
D
z
1
0
•
2
2
–
)
1
z
]
–
}
1
m311
m111
m35
m15
m16
m37
m17
D
D
1
1
1
1
W/R
R/W
D
D
0
0