CS47L85 datasheet(44/370 Pages) CIRRUS

44 / 370 page

CS47L85

Rev 4.3

DEVICE DESCRIPTION

INTRODUCTION

The CS47L85 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 CS47L85 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 digital core provides signal processing capability for sensor hub functions. The programmable DSP allows many external

sensors to be efficiently integrated, enabling increased contextual awareness in a wide variety of advanced user applications.

The CS47L85 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 CS47L85 provides multiple digital audio interfaces, including SLIMbus, 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. Three 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. The CS47L85

‘Always-On’ circuitry can be used (in conjunction

with the Apps Processor) to ‘Wake-Up’ the device following a headphone jack detection event.

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 CS47L85 is a high-performance low-power audio CODEC which uses a simple analogue architecture. Six ADCs are

incorporated, with multiplexers to support up to nine analogue inputs. Eight DACs are incorporated, providing a dedicated

DAC for each analogue output channel.

The analogue outputs comprise three 32mW (121dB SNR) stereo headphone amplifiers with ground-referenced output, and

a Class D stereo speaker driver capable of delivering 2.5W per channel into a 4

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, i.e., wideband voice mode). The ADC input paths can be bypassed, supporting up to 12 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 CS47L85 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.

The CS47L85 is cost-optimised for a wide range of mobile phone applications, and features two channels of Class D power

amplification. For applications requiring more than two channels of power amplification (or when using the integrated Class

D path to drive a haptics actuator), the PDM output channels can be used to drive up to four external PDM-input speaker

drivers. In applications where stereo loudspeakers are physically widely separated, the PDM outputs can ease layout and

EMC by avoiding the need to run the Class-D speaker outputs over long distances and interconnects.

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