WM1811A datasheet(82/328 Pages) WOLFSON

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WM1811A

Production Data

PD, November 2013, Rev 4.1

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 33 EQ Gain Control Range

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 R1154 to R1172 for AIF1, and

registers R1410 to R1428 for AIF2. These coefficients are derived using tools provided in Wolfson’s

WISCE™ evaluation board control software.

Please contact your local Wolfson representative for more details.

Note that the WM1811A audio interfaces may operate at different sample rates concurrently. The EQ

settings for each interface must be programmed relative to the applicable sample rate of the

corresponding audio interface. If the audio interface sample rate is changed, then different EQ register

settings will be required to achieve a given EQ response.

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