LE58QL022BVC datasheet(52/61 Pages) ZARLINK

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Le58QL022

Data Sheet

Zarlink Semiconductor Inc.

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 in-

cludes the initial 1/Z6 gain. The theoretical effective IIR gain, without the Z6 gain and normalization, is actually Z5/Z6.

9A/9Bh Write/Read IIR Z Filter Coefficients (IIR only)

R/W = 0: Write

R/W = 1: Read

This command writes/reads the IIR filter section only, without affecting the FIR.

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:

Sample rate = 32 kHz

For i = 0 to 5 and 7

Power Up and Hardware Reset (RST) Values = 0190 0190 0190 0190 0190 0190 01 0190 (Hex)

(Hz(z) = 0)

See note under Command 80/81h on page 46.

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.

C8/C9h Write/Read Debounce Time Register

This command applies to all channels and does not depend on the state of the Channel Enable Register.

R/W = 0: Write

R/W = 1: Read

Enable E1

EE1 = 0*

E1 multiplexing turned off

EE1 = 1

E1 multiplexing turned on

E1 Polarity

E1P = 0*

E1 is a high-going pulse

E1P = 1

E1 is a low-going pulse

Command

1001101

R/W

I/O Data Byte 1

C45

m45

C35

m35

I/O Data Byte 2

C25

m25

C15

m15

I/O Data Byte 3

C26

m26

C16

m16

I/O Data Byte 4

C47

m47

C37

m37

I/O Data Byte 5

C27

m27

C17

m17

Command

1100100

R/W

I/O Data

EE1

E1P

DSH3

DSH2

DSH1

DSH0

RSVD

ECH

z z

()

–

•

–

•

–

•

–

•

–

-------------------------------------------

•

C1i

m1i

–

•

1C2i

m2i

–

1C3i

m3i

–

•

1C4i

m4i

–

•

()

[]

•

{}

C16

m16

–

•

1C26

m26

–

•

{}

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