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CS42L42

Low-Power Audio Codec with SoundWire and Audio Processing
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CS42L42 Overview

The CS42L42 is a low-power audio codec with integrated MIPI SoundWire® interface or I²C/I²S/TDM interfaces designed for portable applications. It provides a high dynamic range, stereo DAC for audio playback and a mono high dynamic range ADC for audio capture. The CS42L42 features high performance up to 24-bit audio for ADC and DAC audio playback and capture functions and for the S/PDIF transmitter. The CS42L42 architecture includes bypassable SRCs and a bypassable, three-band, 32-bit parametric equalizer that allows processing of digital audio data. A digital mixer is used to mix the ADC or serial ports to the DACs. There is independent attenuation on each mixer input. The processing along the output paths from the ADC or serial port to the two stereo DACs includes volume adjustment and mute control.

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Product Features

Analog I/O

  • Stereo headphone output with 114 dB dynamic range

  • 2 x 35 mW output power into 30 Ω

  • –101 dB THD+N (30 Ω A-weighted) stereo output mode

  • –106 dB THD+N (30 Ω A-weighted) mono output mode

  • Mono mic input with 114 dB dynamic range

  • Integrated AC-coupling capacitors

  • OMTP and AHJ headset-type detect

  • Mic short S0 button detect with ADC auto-mute

System Features

  • Mono equalizer and sidetone mix

  • MIPI SoundWire or I²S/TDM audio interface

  • Audio sample rate converters

  • S/PDIF transmitter

  • Fractional-N PLL

  • Integrated power management

Parametric Specifications

Analog Input TypePseudo-differential
Analog Output TypePseudo-differential
Channels In1
Channels Out2
Control InterfaceSPI/I²C
ADC Dynamic Range (dB)114
DAC Dynamic Range (dB)114
ADC THD+N (dB)-85
DAC THD+N (dB)-90
Sample Rate (kHz)8-192
Analog Power Supply (V)1.8
Digital Power Supply (V)3.3
Logic Power Supply (V)1.8
FeaturesJack detect, impedance detect, sidetone, PLL, SoundWire, SRCs
Package49 WLCSP; 48 QFN

Design Resources

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Evaluation Boards

  • CS42L42 Audio Codec Evaluation Board (CDB42L42)

    The CDB42L42 is a dedicated platform for testing and evaluating the CS42L42, a high-fidelity audio codec with SoundWire and I2S/TDM audio processing, offering extensive FlexGUI software-configurable options and serving as the component and layout reference for the CS42L42.

    Order SampleUser Guide

  • CS42L42 MFi Headset Reference Design (CRD42L42-MFi)

    The CRD42L42-MFi is a rapid development platform for Lightning-connected digital headsets built around the Cirrus Logic CS42L42 hi-fi codec. It includes a compact pendant board, a CDB debug board and MCU example code.

    User Guide

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