WM5102 datasheet(73/334 Pages) WOLFSON

73 / 334 page

Production Data

WM5102

PD, June 2014, Rev 4.2

The WM5102 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 R2920 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 a stereo Dynamic Range Control (DRC) processing block 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 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 Automatic 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.

The DRC also incorporates a Noise Gate function, which provides additional attenuation of very low-

level input signals. This means that the signal path is quiet when no signal is present, giving an

improvement in background noise level under these conditions.

A Signal Detect function is provided within the DRC; this can be used to detect the presence of an

audio signal, and used to trigger other events. The Signal Detect function can be used as an Interrupt

event, or as a GPIO output, or used to trigger the Control Write Sequencer.

WM5102 Datasheet(PDF) 73 Page - Wolfson Microelectronics plc