CS47L24 datasheet(30/256 Pages) CIRRUS

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CS47L24

Rev 4.1

DEVICE DESCRIPTION

INTRODUCTION

The CS47L24 is a highly integrated low-power audio hub for wearable technology and other portable devices. It provides

flexible, high-performance audio interfacing for handheld devices in a small and cost-effective package. It provides

exceptional levels of performance and signal processing capability, suitable for a wide variety of mobile and handheld

devices.

The CS47L24 digital core provides an extensive programmable capability for signal processing algorithms. Cirrus Logic®

Enhanced DRE processing (eDRE) software is included with the CS47L24; additional functions such as multi-mic noise

suppression, acoustic echo cancellation (AEC), and voice recognition are also possible. A number of fixed-function

processing capabilities are incorporated, enabling low/high pass filtering, parametric equalisation (EQ), and dynamic

range control (DRC). Highly flexible digital mixing, including stereo full-duplex asynchronous sample rate conversion,

provides use-case flexibility across a broad range of system architectures. A signal generator for controlling haptics vibe

actuators is included.

The CS47L24 provides multiple digital audio interfaces, in order to provide independent and fully asynchronous

connections to different processors (e.g., application processor, baseband processor and wireless transceiver).

A flexible clocking arrangement supports a wide variety of external clock references, including clocking derived from the

digital audio interface. Two integrated Frequency Locked Loop (FLL) circuits provide additional flexibility.

Unused circuitry can be disabled under software control, in order to save power; low leakage currents enable extended

standby/off time in portable battery-powered applications.

Comprehensive Interrupt (IRQ) logic and status readback are provided. Versatile input/output functionality on two GPIO

pins is also provided.

HI-FI AUDIO CODEC

The CS47L24 is a high-performance low-power audio CODEC with a predominantly digital architecture. The audio

CODEC is controlled directly via register access over an SPI control interface. The simple analogue architecture,

combined with the integrated tone generator, enables simple device configuration and testing, minimising debug time and

reducing software effort.

Two stereo microphone interfaces are provided, supporting up to four channels of digital microphone input. Interface

clocking rates of 768kHz up to 3.072MHz support a wide range of low power vs. high performance operating

requirements. The MICBIAS circuits can provide regulation of the digital microhone power rails; they can also be used as

switches, enabling power gating of the external microphones.

The CS47L24 incorporates three DACs, providing a dedicated DAC for each analogue output channel. All of the mixing,

equalisation, filtering, gain and other audio processing options can be configured independently for each channel; this

allows each signal path to be individually tailored for the load characteristics and application requirements.

The analogue outputs comprise a 33mW (121dB SNR) stereo headphone amplifier with ground-referenced output, and a

mono Class D speaker driver capable of delivering 2W into a 4

Ω load. All outputs have integrated pop and click

suppression features.

The headphone output drivers are powered from an integrated charge pump. The ground-referenced outputs deliver high

quality, power efficient headphone playback, without any requirement for DC blocking capacitors. Ground loop feedback

is incorporated, providing rejection of noise on the ground connections. A mono mode is available on the headphone

outputs; this configures the drivers as differential (BTL) outputs, suitable for an earpiece or hearing aid coil.

The Class D speaker driver delivers excellent power efficiency. High PSRR, low leakage and optimised supply voltage

ranges enable powering from switching regulators or directly from the battery. Battery current consumption is minimised

across a wide variety of voice communication and multimedia playback use cases.

CS47L24 Datasheet(PDF) 30 Page - Cirrus Logic

CS47L24 Datasheet(HTML) 30 Page - Cirrus Logic

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