CS47L24 datasheet(31/256 Pages) CIRRUS

31 / 256 page

CS47L24

Rev 4.1

DIGITAL AUDIO CORE

The CS47L24 audio core is an entirely digital architecture, with audio effects available on all signal paths, regardless of

the respective source or destination. The digital mixing desk allows different audio effects to be applied simultaneously

on many independent paths, whilst also supporting a variety of sample rates concurrently. This helps support many new

audio use-cases. Soft mute and un-mute control allows smooth transitions between use-cases without interrupting

existing audio streams elsewhere.

The dual-core DSP system provides an extensive capability for programmable signal processing algorithms. Cirrus

Logic

’s Enhanced DRE (eDRE) software is included with the CS47L24; additional software packages can be chosen

according to the requirements of the target application. The CS47L24 can support many advanced audio processing

features, including multi-mic noise suppression, acoustic echo cancellation (AEC), and voice recognition functions. User-

programmed solutions can also be implemented.

Highly flexible digital mixing, including mixing between audio interfaces, is possible. The CS47L24 performs multi-

channel full-duplex asynchronous sample rate conversion, providing use-case flexibility across a broad range of system

architectures. Automatic sample rate detection is provided, enabling seamless wideband/narrowband voice call handover.

Dynamic Range Controller (DRC) functions are available for optimising audio signal levels. In playback modes, the DRC

can be used to maximise loudness, while limiting the signal level to avoid distortion, clipping or battery droop, in particular

for high-power output drivers such as speaker amplifiers. In record modes, the DRC assists in applications where the

signal level is unpredictable.

The 5-band parametric equaliser (EQ) functions can be used to compensate for the frequency characteristics of the

output transducers. EQ functions can be cascaded to provide additional frequency control. Programmable high-pass and

low-pass filters are also available for general filtering applications such as removal of wind and other low-frequency noise.

DIGITAL INTERFACES

Three serial digital audio interfaces (AIFs) each support PCM, TDM and I2S data formats for compatibility with most

industry-standard chipsets. AIF1 supports eight input/output channels; AIF2 supports six input/output channels; AIF3

supports two input/output channels. Bidirectional operation at sample rates up to 192kHz is supported.

Four digital PDM input channels are available (two stereo interfaces); these are typically used for digital microphones,

powered from the integrated MICBIAS power supply regulators.

The CS47L24 is equipped with a SPI control interface, operating up to 26MHz. This is primarily used for control register

access, but it can also support buffered audio data transfers associated with voice command software.

CS47L24 Datasheet(PDF) 31 Page - Cirrus Logic