CS47L90
Low Power, Highly Integrated Smart Audio Codec
Featuring SoundClear Software for “Always On, Always Listening”
Voice Activation and SmartHIFI for Mobile Playback
Product Overview
The Cirrus Logic CS47L90 is an ultra low power high-fidelity smart audio codec that combines an
advanced DSP feature set with a flexible and highly integrated hi-fi audio codec featuring Cirrus
Logic’s SmartHIFI™. With seven programmable DSP cores, the CS47L90 can support multiple
voice applications and audio features in parallel, including multi-mic wideband noise reduction,
high performance acoustic-echo cancellation (AEC), stereo ambient noise cancellation (ANC), and
advanced speech and media enhancements – without draining battery life.
The CS47L90 features a 975 MIPS multi-core audio signal processor with advanced clocking architecture and a high performance
4 channel ADC/8 channel DMIC 24-bit hi-fi audio codec embedded with SoundClear® software technology. SoundClear Control
provides “always on, always listening” seamless multi-trigger word detection that does not require the applications processor
to remain awake and thus conserves standby mode power. SoundClear Playback provides speaker protection and virtual
stereo sound, while the codec’s DNA delivers SmartHIFI audio for mobile playback devices. SmartHIFI is a unique combination
of powerful DSP processing and audio performance to deliver an audio experience typically associated with high-end audio
equipment but now optimized for mobile audio playback while maximizing battery life. In addition to leading specifications for
typical audio parameters such as THD, SNR, etc, SmartHIFI includes a high-end feature set – tunable hi-fi filters, jitter-free audio,
high sample rate and bit depth support (24/32-bit, 192 kHz). Support for third party DSP programming also allows creativity for
customer defined product feature differentiation.
Additional specifications for the CS47L90 include three stereo, multi-purpose headphone output drivers each with stereo ground
reference or mono BTL outputs, 127dB SNR and noise levels as low as 0.63 µVRMS for hi-fi quality headphone output, plus a
four-channel digital speaker interface. Programmable wideband, multi-microphone processing is standard with the device’s seven
analog inputs and up to 10 PDM digital inputs, along with single-ended or differential mic/line inputs. The device is powered from
1.8 V and 1.2 V supplies with support for low power sleep mode (10 mA) and configurable wake-up events.
Available Software Features*
Communications
SoundClear Voice
Make/receive calls with optimized
voice quality based on use cases
from a smartphone or tablet
• Up to 16 kHz processing
• Speaker protection
VOICE
• Up to 3-mic handset or speakerphone • Wind noise reduction
Tx NR & AEC
Convenience
SoundClear Control
“Always on” listening with minimal
power consumption range
• Multi-trigger word detection
• User defined trigger word detection
• Extended audio buffer
• Two-channel input, output
• Barge-in supported
CONTROL
Capture
SoundClear Record
Capture noise-free audio when and
where needed
• Up to 48 kHz processing
• 2~4 Concurrent MIC input processing
• Wind/mic/focus/background
noise reduction
RECORD
Content
SoundClear Playback
• MasterHIFI™
Enjoy 192k, 24-bit high resolution
audio playback; support for branded
third party algorithms
• Multi-band compressor
• Stereo ANC
PLAYBACK
• Speaker protection
Contextual Awareness
SoundClear Sense
• Proof of sensor fusion capability
SENSE
*Software features and pricing vary based on specific use application. Contact a local Cirrus Logic sales representative for further information.
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