WM8281ECSSLASHR datasheet(78/392 Pages) CIRRUS

78 / 392 page

WM8281

Rev 4.0

asynchronous and/or configured for a different sample rate.

The DRC functions are enabled using the control registers described in Table 13.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R3712

(0E80h)

DRC1 ctrl1

DRC1L_ENA

DRC1 (Left) Enable

0 = Disabled

1 = Enabled

DRC1R_ENA

DRC1 (Right) Enable

0 = Disabled

1 = Enabled

R3721

(0E89h)

DRC2 ctrl1

DRC2L_ENA

DRC2 (Left) Enable

0 = Disabled

1 = Enabled

DRC2R_ENA

DRC2 (Right) Enable

0 = Disabled

1 = Enabled

Table 13 DRC Enable

The following description of the DRC is applicable to each of the DRCs. The associated register

control fields are described in Table 15 and Table 16 for DRC1 and DRC2 respectively.

DRC Compression / Expansion / Limiting

The DRC supports two different compression regions, separated by a “Knee” at a specific input

amplitude. In the region above the knee, the compression slope DRCn_HI_COMP applies; in the

region below the knee, the compression slope DRCn_LO_COMP applies.

(Note that ‘n’ identifies the

applicable DRC 1 or 2.)

The DRC also supports a noise gate region, where low-level input signals are heavily attenuated. This

function can be enabled or disabled according to the application requirements. The DRC response in

this region is defined by the expansion slope DRCn_NG_EXP.

For additional attenuation of signals in the noise gate region, an additional “knee” can be defined

(shown as “Knee2” in Figure 31). When this knee is enabled, this introduces an infinitely steep drop-

off in the DRC response pattern between the DRCn_LO_COMP and DRCn_NG_EXP regions.

The overall DRC compression characteristic in “steady state” (i.e. where the input amplitude is near-

constant) is illustrated in Figure 31.

DRCn_KNEE_IP

(Y0)

0dB

DRC

n_H

I_CO

DRCn Input Amplitude (dB)

DRCn Output Amplitude (dB)

DRCn_KNEE_OP

Knee1

Knee2

DRCn_KNEE2_IP

DRCn_KNEE2_OP

Figure 31 DRC Response Characteristic

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