[Conexant]

Overview
Conexants CX20671 HD Audio codec SoC is a low-power,102 dB SNR, highperformance audio codec with integrated 2-WRMS (per channel) stereo speaker amplifier with Spread Spectrum EMI dispersion technology. Two independent pairs of DACs and three independent pairs of ADCs support Multi-Streaming and Real Time Communications applications. The audio fidelity of the device exceeds Microsoft WLP 4.0 Desktop and Notebook Premium Logo requirements. Additionally, the device achieves a high level of integration by featuring an integrated 5 V to 3.3 V Low-dropout (LDO) voltage regulator that guarantees high performance analog audio performance without incurring external BOM, and an integrated 3.3 V to 1.8 V low-dropout voltage regulator used to power internal digital blocks. features a ProC

CX20671 Audio Codec Features
♦ 24-bit, two pairs of independent DACs and three pairs of independent ADCs
♦ ProCoustic headphone driver, which delivers 50 mW into 32 Ω load with no pop, eliminating the need for an external amplifier and DC-blocking capacitors
♦ Integrated 5 V to 3.3 V low-dropout voltage regulator for improved audio performance, eliminating need for external regulator or power transistor
♦ Integrated 3.3 V to 1.8 V low-dropout voltage regulator, used to power digital blocks
♦ Integrated 2 WRMS (per channel) class-D stereo speaker amplifier with Spread Spectrum and 10-kV ESD withstand capability
♦ Digital Microphone interface with internal MIC boost supporting 2 digital microphone elements
♦ Independent Sony Philips Digital Interface (SPDIF) Output supporting sample rates 44.1 kHz, 48 kHz, and 96 kHz, 16, 20, and 24-bit resolution
♦ Internal microphone boost
    – Digital: 0, 12, 24, 36, 48 dB
    – Analog: 0, 10, 20, 30, 40 dB
♦ Microphone Security Control (Contact Conexant Sales/FAE for additional information).
♦ Exceeds Vista/Windows 7 Desktop and Notebook Premium Logo Requirements, WLP4.0
♦ D-Flex power management exceeds Intel ECR 15B requirements, and features Wake-On-PCBeep functionality
♦ Hardware Headphone limiter bit (supports GS Mark EN50332-2)
♦ Compliant with Intel High Definition Audio Specification Rev. 1.0
♦ Supports both 1.5 V and 3.3 V signaling with the core logic chipset
♦ Retaskable ports
    – Configure between Headphone and Line-out or between Mic and Line-in
♦ Independent sampling rate for DAC and ADC; supports audio formats ranging from 16-bit, 44.1 kHz to 24-bit, 192 kHz
♦ Pop Shield: pops and clicks reduction circuitry, including class-D speaker outputs
♦ Jack sense detects up to four jacks using only one sense pin
♦ Digital Mixer
♦ +3.3 V analog and I/O operation; uses Vaux for power management modes
♦ Audio Director for Headphone and Internal Speakers Redirection (optional).
    – Supporting Classic Mode
    – Vista/Windows 7 Multi-Stream
    – Custom Multi-Stream Mode
♦ Voice Processing Algorithms (optional)
    – End-to-end Noise Reduction (patent pending)
    – Multi-band Acoustic Echo Cancellation
    – Side Noise Rejection Beam Forming
♦ SmartAudio GUI (optional) - advanced audio control
♦ Digital Parametric SmartEQ with Dynamic Compression DSP (optional)
    – Enhances the sound quality on low cost speakers
    – Night Mode
♦ 3D Expander
♦ Third Party Logo Software support includes
    – SRS
    – Dolby
    – Creative Labs
    – ForteMedia
    – Andrea
    – MaaxAudio
    – Virage Logic
♦ Supports 32-bit/64-bit Windows OS and Linux
♦ Available in 40-pad thermally-enhanced QFN package