Audio
Speakers-on-a-Chip
Speakers-on-a-Chip with On-chip Voice/Audio DSP, Integrated
I2S/I2C Codec, and Mono Class-D Amplifier
CX20707
Conexant’s portfolio includes a comprehensive suite of semiconductor
solutions for communications and consumer applications.
The CX20707 is one of Conexant’s Speakers-on-a-Chip (SPoC) embedded audio
solutions designed for voice communication applications, such as Two-way
Intercoms, Security Intercoms, and Doorphone Systems. The device features a
proprietary on-chip Digital Signal Processor (DSP), Codec, Mono Class-D Driver,
I2S and I2C 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 mono capless headphone driver in a cost-effective single-chip package.
The DSP runs a suite of turnkey audio and voice enhancement algorithms that
dramatically improve sound quality.
This product is part of the CX2070x SPoC family,
which includes CX20702, CX20703, CX20704, CX20705, CX20706 and CX20709.
The device features multiple high performance 24-bit DACs for mono speaker
output, multiple 24-bit high performance ADCs supporting mono microphone
and mono line input, mono capless headphone output or mono single-ended/
differential line output, support for bi-directional 12S, PCM, S/PDIF-out with
independent sampling rates, 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 mono Class-D amplifier drives a maximum
of 2.5 W (average) from the integrated amplifier. The device can be controlled
and configured by both read and write capability through I2C and Serial Peripheral
Interface (SPI), or UART.
The on-chip DSP runs a suite of innovative Conexant proprietary voice processing
algorithms and audio post processing effects that that delivers a clear, rich and
full sound experience to the end user 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,
Noise Reduction, Subband Line Echo Cancellation, Equalizer, Dynamic Range
Compression, and Mic Auto Gain Control. The embedded SPoC Configuration
Toolbox allows for fast configuration and performance optimization.
The CX20707 turnkey solution eliminates the need for a multiple-chip reference
design, making it easy and economical for manufacturers to design products for
high quality intercom applications. A complete evaluation kit with reference board
and all the necessary technical documents and software is available.
The SoC is packaged in an environmentally-friendly, RoHS/Green-compliant 76-pin
QFN (Quad Flat No leads) package.
Distinguishing Features
• 24-bit DAC/ADC, SNR 102 dB, THD - 92 dB at
48 kHz 3.3 V
• Programmable on-chip proprietary DSP
– Subband acoustic echo suppression and
cancellation
– Noise reduction for inbound speech (far end)
and outbound speech (near end)
– Subband line echo canceller
– Dynamic loudness adaptor
– Mic auto gain control
– Digital equalizer (10 bands/channel)
– Dynamic range compression
• One 2-wire I2C or 4-wire SPI slave, or UART
interface for external MCU
• 2.5 W BTL mono Class-D speaker amplifier
• Mono 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
Applications
• Two-way Intercom
• Security Intercom
• Doorphone Systems
Part Number
CX20707
Description
Speakers-on-a-Chip with On-chip
Voice/Audio DSP Integrated I2S/ I2C
,
Codec, and Mono Class-D Amplifier
CONEXANT [ CONEXANT SYSTEMS, INC ]
