WM8912 datasheet(29/129 Pages) CIRRUS

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Production Data

WM8912

PD, Rev 4.1, February 2013

EQ GAIN SETTING

GAIN (DB)

00000

-12

00001

-11

00010

-10

00011

-9

00100

-8

00101

-7

00110

-6

00111

-5

01000

-4

01001

-3

01010

-2

01011

-1

01100

01101

01110

01111

10000

10001

10010

10011

10100

10101

10110

+10

10111

+11

11000

+12

11001 to 11111

Reserved

Table 12 EQ Gain Control

RETUNE

TM MOBILE MODE

ReTune

TM Mobile mode provides a comprehensive facility for the user to define the cut-off/centre

frequencies and filter bandwidth for each EQ band, in addition to the gain controls already described.

This enables the EQ to be accurately customised for a specific transducer characteristic or desired

sound profile.

The EQ enable and EQ gain controls are the same as defined for the default mode. The additional

coefficients used in ReTune

TM Mobile mode are held in registers R140 to R157. These coefficients

are derived using tools provided in Wolfson’s WISCE™ evaluation board control software.

Please contact your local Wolfson representative for more details.

EQ FILTER CHARACTERISTICS

The filter characteristics for each frequency band are shown in Figure 16 to Figure 20. These figures

show the frequency response for all available gain settings, using default cut-off/centre frequencies

and bandwidth.

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