WM8281ECSSLASHR datasheet(43/392 Pages) CIRRUS

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WM8281

Rev 4.0

DEVICE DESCRIPTION

INTRODUCTION

The WM8281 is a highly integrated low-power audio hub CODEC for mobile telephony and 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 WM8281 digital core incorporates the Cirrus Logic Ambient Noise Cancellation (ANC), and

provides an extensive capability for programmable signal processing algorithms, including receive

(RX) path noise cancellation, transmit (TX) path noise reduction, and Acoustic Echo Cancellation

(AEC) algorithms.

The WM8281 digital core supports audio enhancements such as Dynamic Range Control (DRC),

Multi-band Compression (MBC), and Virtual Surround Sound (VSS). 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 WM8281 provides multiple digital audio interfaces, including SLIMbus, in order to provide

independent and fully asynchronous connections to different processors (eg. 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.

Configurable ‘Wake-Up’

actions can be associated with the low-power standby (Sleep) mode.

Versatile GPIO functionality is provided, and support for external accessory / push-button detection

inputs. Comprehensive Interrupt (IRQ) logic and status readback are also provided.

HI-FI AUDIO CODEC

The WM8281 is a high-performance low-power audio CODEC which uses a simple analogue

architecture. 6 ADCs and 8 DACs are incorporated, providing a dedicated ADC for each analogue

input and a dedicated DAC for each output channel.

The analogue outputs comprise three 30mW (114dB SNR) stereo headphone amplifiers with ground-

referenced output, and a Class D stereo speaker driver capable of delivering 2W per channel into a

Ω load. Six analogue inputs are provided, each supporting single-ended or differential input modes.

In differential mode, the input path SNR is 106dB (16kHz sample rate, ie. wideband voice mode). The

ADC input paths can be bypassed, supporting up to 8 channels of digital microphone input.

The audio CODEC is controlled directly via register access. The simple analogue architecture,

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

minimising debug time and reducing software effort.

The WM8281 output drivers are designed to support as many different system architectures as

possible. Each output has a dedicated DAC which allows mixing, equalisation, filtering, gain and other

audio processing to be configured independently for each channel. This allows each signal path to be

individually tailored for the load characteristics. All outputs have integrated pop and click suppression

features.

The headphone output drivers are ground-referenced, powered from an integrated charge pump,

enabling 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 drivers deliver 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.

WM8281ECS/R Scheda tecnica(PDF) 43 Page - Cirrus Logic

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