CS47L35 datasheet(27/300 Pages) CIRRUS

27 / 300 page

DS1085F3

CS47L35

4.1 Overview

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

digital audio interface. The frequency-locked loop (FLL) circuit provides additional flexibility.

Unused circuitry can be disabled under software control to save power; low leakage currents enable extended standby/off

time in portable battery-powered applications. The CS47L35 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, including support for external accessory/push-button detection inputs.

Comprehensive interrupt functions, with status reporting, are also provided.

4.1.1

Hi-Fi Audio Codec

The CS47L35 is a high-performance, low-power audio codec that uses a simple analog architecture. Four ADCs are

incorporated, with multiplexers to support up to six analog inputs. Three DACs are incorporated, with two being switchable

between the headphone and BTL-earpiece analog output paths.

The analog outputs comprise a 30-mW (122 dB SNR) stereo headphone amplifier with ground-referenced output, a mono

(BTL) earpiece driver, and a mono Class D speaker driver capable of delivering 2.7 W into a 4-

 load. Six analog inputs

are provided (multiplexed into four input channels), each supporting single-ended or differential input modes. In differential

mode, the input path SNR is 105 dB (16 kHz sample rate, i.e., wideband voice mode). The ADC input paths can be

bypassed, supporting up to four channels of DMIC input.

The audio codec is controlled directly via register access. The simple analog architecture, combined with the integrated

tone generator, enables straightforward device configuration and testing, minimizing debug time and reducing software

effort.

The CS47L35 output drivers are designed to support a range of different system architectures. Each output path supports

independent signal mixing, equalization, filtering, and gain controls. This allows each signal path to be individually tailored

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

The headphone and earpiece 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.

The Class D speaker driver delivers excellent power efficiency. Speaker protection software is supported within the DSP

core, enabling maximum audio output without risk of damage to the external speaker. High PSRR, low leakage and

optimized supply voltage ranges enable powering from switching regulators or directly from the battery. Battery current

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

The CS47L35 is cost optimized for a wide range of mobile phone applications, and incorporates a mono Class D power

amplifier. For applications requiring more than one channel 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 external PDM-input speaker drivers. The

PDM outputs can ease layout and electromagnetic compatibility by avoiding the need to run the Class D speaker output

over a long distance and across interconnects.

4.1.2

Digital Audio Core

The CS47L35 uses a core architecture based on all-digital signal routing, making digital audio effects available on all signal

paths, regardless of whether the source data input is analog or digital. The digital mixing desk allows different audio effects

to be applied simultaneously on many independent paths, while supporting a variety of sample rates. This helps support

many new audio use cases. Soft mute and unmute control allows smooth transitions between use cases without

interrupting existing audio streams elsewhere.

The CS47L35 digital core provides an extensive capability for programmable signal-processing algorithms. The

SoundClear suite of software algorithms enable advanced multimic audio features, such as transmit (TX) path noise

reduction, AEC, wind-noise reduction, and other programmable filters. Enhancements such as DRC and MBC are also

provided.

CS47L35 Datasheet(PDF) 27 Page - Cirrus Logic

CS47L35 Datasheet(HTML) 27 Page - Cirrus Logic

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL