WM5102 datasheet(76/334 Pages) WOLFSON

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WM5102

Production Data

PD, June 2014, Rev 4.2

in the response pattern illustrated, resulting in infinitely steep attenuation at this point in the response.

The DRC parameters are listed in Table 13.

REF

PARAMETER

DESCRIPTION

DRC1_KNEE_IP

Input level at Knee1 (dB)

DRC1_KNEE_OP

Output level at Knee2 (dB)

DRC1_HI_COMP

Compression ratio above Knee1

DRC1_LO_COMP

Compression ratio below Knee1

DRC1_KNEE2_IP

Input level at Knee2 (dB)

DRC1_NG_EXP

Expansion ratio below Knee2

DRC1_KNEE2_OP

Output level at Knee2 (dB)

Table 13 DRC Response Parameters

The noise gate is enabled when the DRC1_NG_ENA register is set. When the noise gate is not

enabled, parameters 5, 6, 7 above are ignored, and the DRC1_LO_COMP slope applies to all input

signal levels below Knee1.

The DRC1_KNEE2_OP knee is enabled when the DRC1_KNEE2_OP_ENA register is set. When this

bit is not set, then parameter 7 above is ignored, and the Knee2 position always coincides with the low

end of the DRC1_LO_COMP region.

The “Knee1” point in Figure 31 is determined by register fields DRC1_KNEE_IP and

DRC1_KNEE_OP.

Parameter Y0, the output level for a 0dB input, is not specified directly, but can be calculated from the

other parameters, using the equation:

Y0 = DRC1_KNEE_OP - (DRC1_KNEE_IP x DRC1_HI_COMP)

Gain Limits

The minimum and maximum gain applied by the DRC is set by register fields DRC1_MINGAIN,

DRC1_MAXGAIN and DRC1_NG_MINGAIN. These limits can be used to alter the DRC response

from that illustrated in Figure 31. If the range between maximum and minimum gain is reduced, then

the extent of the dynamic range control is reduced.

The minimum gain in the Compression regions of the DRC response is set by DRC1_MINGAIN. The

mimimum gain in the Noise Gate region is set by DRC1_NG_MINGAIN. The minimum gain limit

prevents excessive attenuation of the signal path.

The maximum gain limit set by DRC1_MAXGAIN prevents quiet signals (or silence) from being

excessively amplified.

Dynamic Characteristics

The dynamic behaviour determines how quickly the DRC responds to changing signal levels. Note

that the DRC responds to the average (RMS) signal amplitude over a period of time.

The DRC1_ATK determines how quickly the DRC gain decreases when the signal amplitude is high.

The DRC1_DCY determines how quickly the DRC gain increases when the signal amplitude is low.

These register fields are described in Table 14. Note that the register defaults are suitable for general

purpose microphone use.

WM5102 Datasheet(PDF) 76 Page - Wolfson Microelectronics plc

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