With seven programmable DSP cores, the CS47L90, from Cirrus Logic, 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 four-channel ADC, eight-channel DMIC, and 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, delivering 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, and more, 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, 127 dB 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.