WM8998 datasheet(53/307 Pages) WOLFSON

53 / 307 page

Production Data

WM8998

PD, October 2014, Rev 4.0

DIGITAL CORE

The WM8998 digital core provides extensive mixing and processing capabilities for multiple signal

paths. The configuration is highly flexible, and virtually every conceivable input/output connection can

be supported between the available processing blocks.

The digital core provides parametric equalisation (EQ) functions, dynamic range control (DRC), and

low-pass / high-pass filters (LHPF).

The WM8998 supports multiple signal paths through the digital core. Stereo full-duplex sample rate

conversion is provided to allow digital audio to be routed between input (ADC) paths, output (DAC)

paths, Digital Audio Interfaces (AIF1, AIF2 and AIF3) and SLIMbus paths operating at different

sample rates and/or referenced to asynchronous clock domains.

The digital core incorporates a S/PDIF transmitter, which can provide a stereo S/PDIF output on a

GPIO pin. Standard S/PDIF sample rates of 32kHz up to 192kHz can be supported.

The WM8998 incorporates two 1kHz tone generators which can be used for ‘beep’ functions through

any of the audio signal paths.

A haptic signal generator is provided, for use with external haptic devices (eg. mechanical vibration

actuators). Two Pulse Width Modulation (PWM) signal generators are also provided; the PWM

waveforms can be modulated by an audio source within the digital core, and can be output on a GPIO

pin.

An overview of the digital core processing and mixing functions is provided in Figure 19. An overview

of the external digital interface paths is provided in Figure 20.

The control registers associated with the digital core signal paths are shown in Figure 21 through to

Figure 36. The full list of digital mixer control registers is provided in the “Register Map” section

(Register R1600 through to R2920). Generic register definitions are provided in Table 7.

WM8998 Datasheet(PDF) 53 Page - Wolfson Microelectronics plc