Audio Codec. CS42L92 Datasheet
32-Bit 384-kHz Hi-Fi Audio Codec
• Integrated multichannel 32-bit hi-fi audio hub codec
— 99-dB signal-to-noise ratio (SNR) mic input (48 kHz)
— 127-dB SNR headphone playback (48 kHz)
— –100-dB total harmonic distortion + noise (THD+N)
— Ultrasonic input- and output-path support
• Up to eight analog or digital microphone (DMIC) inputs
• Multipurpose headphone/earpiece/line output drivers
— Support for balanced headphone output loads
— 33 mW into 32- load at 0.1% THD+N
— Hi-fi filters for audiophile-quality playback
• Native audio playback up to 384 kHz sample rate,
concurrent with voice and ultrasonic input signal paths
• Digital pulse-density modulation (PDM) output interface
• Multichannel asynchronous sample-rate conversion
• Multiline SLIMbus® audio and control interface
• Three multichannel digital-audio interfaces
— Standard data formats up to 384 kHz, 32 bits
• Flexible clocking, derived from MCLKn, AIFn, or SLIMbus
— Low-power frequency-locked loops (FLLs) support
reference clocks down to 32 kHz.
• Advanced accessory detection functions
• Configurable functions on up to 16 general-purpose
input/output (GPIO) pins
• Integrated regulators and charge pumps
• Small W-CSP package, 0.4-mm staggered ball array
• Smartphones, tablets, and multimedia handsets
4 x ADC
4 x Stereo
Digital Audio Interfaces
AIF1, AIF2, AIF3
Digital Mixing Core
Five-band equalizer (EQ)
Dynamic range control (DRC)
Low-pass/high-pass filter (LHPF)
Asynchronous sample -rate conversion
Automatic sample -rate detection
Data format conversion
PWM signal generator
Haptic control signal generator
AEC (Echo Cancelation)
Control Interface (SPI/I2C)
Copyright Cirrus Logic, Inc. 2017–2018
(All Rights Reserved)
The CS42L92 is a highly integrated low-power audio system for smartphones, tablets, and other portable audio devices.
Multiple input/output paths are supported by a fully flexible all-digital mixing and routing engine, incorporating sample rate
converters and other signal-processing functions for wide use-case flexibility. The integrated DSP provides a
general-purpose signal processing capability; this is supported by general-purpose timer and event-logger functions.
The digital audio interfaces and hi-fi DACs enable 32-bit playback through the entire signal chain. Native audio playback
at sample rates up to 384 kHz is possible, concurrent with voice and ultrasonic input paths.
The CS42L92 supports up to eight analog inputs and up to eight PDM digital inputs. Low-power input modes are available
for always-on (e.g., voice-trigger) functionality using either analog or digital input. A smart accessory interface, with
multipurpose impedance sensing and measurement capability, supports detection of external headsets and push buttons.
Dual headphone connections (e.g., 3.5-mm and USB-C™) can be detected simultaneously.
Four hi-fi quality stereo headphone drivers are provided, each supporting stereo ground-referenced or mono bridge-tied
load (BTL) configurations. Multiple headphone/earpiece outputs can be supported, including balanced stereo headphone
configurations. The output drivers offer noise levels as low as 0.63 VRMS into line or headphone loads. Selectable hi-fi
filters support playback modes at sample rates up to 384 kHz.
Two channels of PDM output (one stereo interface) are available, and also an IEC-60958-3–compatible S/PDIF
transmitter. A signal generator for controlling haptics devices is included; vibe actuators can connect directly to the PDM
output interface. All inputs, outputs, and system interfaces can function concurrently.
A SLIMbus interface supports multichannel audio paths and host control register access. Three further digital audio
interfaces are provided, each supporting a wide range of standard audio sample rates and serial interface formats.
Automatic sample-rate detection enables seamless wideband/narrowband voice-call handover. Two FLLs are integrated,
providing support for a wide range of system-clock frequencies.
The CS42L92 is configured using the SLIMbus, SPI™, or IC interfaces. The device is powered from 1.8- and 1.2-V
supplies. The power, clocking, and output driver architectures are designed to maximize battery life in voice, music, and
standby modes. Low-power (10 A) Sleep Mode is supported, with configurable wake-up events.