CS47L35 datasheet(52/300 Pages) CIRRUS

52 / 300 page

DS1085F3

CS47L35

4.3 Digital Core

The following description of the DRC is applicable to each of the DRCs. The associated control fields are described in

Table 4-13 and Table 4-14 for DRC1 and DRC2.

4.3.5.1 DRC Compression, Expansion, and 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 Knee 2 in

Fig. 4-18). 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 shown in

Fig. 4-18.

Table 4-11. DRC Enable

Bit

Label

Default

Description

R3712 (0x0E80)

DRC1_ctrl1

DRC1L_ENA

DRC1 (left) enable

0 = Disabled

1 = Enabled

DRC1R_ENA

DRC1 (right) enable

0 = Disabled

1 = Enabled

R3720 (0x0E88)

DRC2_ctrl1

DRC2L_ENA

DRC2 (left) enable

0 = Disabled

1 = Enabled

DRC2R_ENA

DRC2 (right) enable

0 = Disabled

1 = Enabled

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