WM8952ECSSLASHRV datasheet(24/72 Pages) WOLFSON

24 / 72 page

WM8952

Pre Production

PP, Rev 3.1, June 2011

PROGRAMMABLE NOTCH FILTERS

Four programmable notch filters are provided. These filters have a programmable centre frequency

and bandwidth, programmable via two coefficients, a0 and a1. a0 and a1 are represented by the

sign / magnitude notation to enter into the registers. Notch Filter 3 can also be programmed as a 1st

order low pass filter.

Because these coefficient values require two register writes to set up there is an NFx_UP (Notch

Filter Update) flag for each filter which should be set only when both A0 and A1 for the filter have

been set.

The notch filters can be individually enabled, using the corresponding NFx_EN register bit, as can be

seen in Figure 11:

Figure 11 Labelling of Notch Filters and Arrangement of Notch Filter Enables

The notch filter coefficients must be entered using a sign / magnitude notation.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R16

Notch Filter 0A

NF0_UP

Notch filter 0 update. The notch filter 0

values used internally only update when

one of the NF0_UP bits is set high.

NF0_EN

Notch filter 0 enable:

0=Disabled

1=Enabled

13:0

NF0_A0

Notch Filter 0 a0 coefficient

R17

Notch Filter 0B

NF0_UP

Notch filter 0 update. The notch filter 0

values used internally only update when

one of the NF0_UP bits is set high.

13:0

NF0_A1

Notch Filter 0 a1 coefficient

Table 15 Notch Filter 0 Function

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