Audio
Speakers-on-a-Chip
Speakers-on-a-Chip with On-chip Voice/Audio DSP, Integrated
2
I C/USB Codec, and Mono Class-D Amplifier
CX20706
Conexant’s portfolio includes a comprehensive suite of semiconductor
solutions for communications and consumer applications.
The CX20706 features a proprietary on-chip Digital Signal Processor (DSP), Codec,
2
Mono Class-D amplifier, USB, UART, and I C interfaces, high performance 24-bit DAC’s
and ADC’s, a range of digital and analog input/output channel selections for flexible
routing and mixing, and a stereo capless headphone driver in a cost-effective single-
chip package. The device is one of Conexant’s Speakers-on-a-Chip (SPoC) embedded
audio solutions for convergence audio entertainment and voice communication
applications. The solution features a suite of turnkey audio and voice enhancement
algorithms designed for Unified Communication peripherals such as headsets, handsets,
desk phones, speakerphone, and conferencing systems. The CX20706 is compliant
with Microsoft Office Communicator peripheral requirements. This product is part of
the CX2070x SPoC family, which includes CX20702, CX20703, CX20704, CX20705,
CX20707 and CX20709.
The device features multiple high performance 24-bit DACs for 2 CH PWM output,
multiple 24-bit high performance ADCs supporting mono or array microphones and up
to two stereo line inputs, capless headphone output or single-ended/differential line-
Distinguishing Features
output, and a range of digital and analog input/output channel selections for flexible
routing and mixing. Different audio sampling rates ranging from 8 kHz to 96 kHz are
generated directly from the master clock without the need for external PLL. The
• 24-bit DAC/ADC, SNR 102 dB, THD - 92 dB at
48 kHz 3.3 V
• Programmable on-chip proprietary DSP
power-efficient mono Class-D amplifier drives a maximum of 2.5 W (average) from the
– Subband acoustic echo suppression and
integrated amplifier. The USB interface supports full speed, and is USB 2.0 Audio Class
cancellation
compliant for both control and data.
– Stereo beam-forming
– Noise reduction
– Dynamic loudness adaptor
– Mic auto gain control
The on-chip Digital Signal Processor (DSP) runs a suite of innovative Conexant
proprietary voice processing algorithms and audio post processing effects that
dramatically improves sound quality and frees-up processing power for other
applications without compromising on cost and future firmware scalability. Key audio
innovations include Subband Acoustic Echo Suppression and Cancellation, Stereo
Beam-forming, Noise Reduction, Dynamic Loudness Adapter, Mic Auto Gain Control,
Digital Equalizer, and Dynamic Range Compression. The embedded SPoC Configuration
Toolbox allows for fast configuration and performance optimization.
– Digital equalizer (10 bands/channel)
– Dynamic range compression
• USB 2.0 Audio Class compliant interface (full
speed data and control)
2
• One 2-wire I C or 4-wire SPI slave, or UART
interface for external MCU
The CX20706 turnkey solution eliminates the need for a multiple-chip reference design,
making it easy and economical for manufacturers to design products for high quality
Unified Communication applications. A complete evaluation kit with reference board
and all the necessary technical documents and software is available.
• 2.5 W BTL mono Class-D speaker amplifier
• Two microphone interfaces with on-chip bias
supply
• Flexible power management
• Audio sample rate: 8, 11.025, 12, 16, 22.05, 24, 32,
44.1, 48, 64, 88.2, 96 kHz
The SoC is packaged in an environmentally-friendly, RoHS/Green-compliant 76-pin
QFN (Quad Flat No leads) package.
Applications
•ꢀ Unified Communication peripherals
– Headset
– Handset
– Desk Phone
– Speakerphone
Part Number CX20706
Description Speakers-on-a-Chip with On-chip
2
Voice/Audio DSP, Integrated I C/USB
Codec, and Mono Class-D Amplifier
– Conferencing System
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