WM8281ECSSLASHR datasheet(76/392 Pages) CIRRUS

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WM8281

Rev 4.0

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 Range

The WM8281 performs automatic checks to confirm that the SYSCLK frequency is high enough to

support the commanded EQ and digital mixing functions. If an attempt is made to enable an EQ signal

path, and there are insufficient SYSCLK cycles to support it, then the attempt will be unsuccessful.

(Note that any signal paths that are already active will not be affected under these circumstances.)

The Underclocked Error

can be monitored using the GPIO and/or Interrupt functions. See “General

Purpose Input / Output

” and “Interrupts” for further details.

The FX_STS field in Register R3585 indicates the status of each of the EQ, DRC and LHPF signal

paths. If an Underclocked Error condition occurs, then this register provides readback of which EQ,

DRC or LHPF signal path(s) have been successfully enabled.

The status bits in Registers R1600 to R3000 indicate the status of each of the digital mixers. If an

Underclocked Error condition occurs, then these bits provide readback of which mixer(s) have been

successfully enabled.

DYNAMIC RANGE CONTROL (DRC)

The digital core provides two stereo Dynamic Range Control (DRC) processing blocks as illustrated in

Figure 30. A 4-input mixer is associated with each DRC input channel. The 4 input sources are

selectable in each case, and independent volume control is provided for each path. The stereo DRC

blocks support 2 outputs each.

The function of the DRC is to adjust the signal gain in conditions where the input amplitude is

unknown or varies over a wide range, e.g. when recording from microphones built into a handheld

system, or to restrict the dynamic range of an output signal path.

The DRC can apply Compression and Autom

atic Level Control to the signal path. It incorporates ‘anti-

clip’ and ‘quick release’ features for handling transients in order to improve intelligibility in the

presence of loud impulsive noises.

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