CONEXANT CX20706 2.5 w btl mono class-d speaker amplifier Datasheet

Audio
Speakers-on-a-Chip
Speakers-on-a-Chip with On-chip Voice/Audio DSP, Integrated
I2C/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,
Mono Class-D amplifier, USB, UART, 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 stereo capless headphone driver in a cost-effective singlechip 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 lineoutput, 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
power-efficient mono Class-D amplifier drives a maximum of 2.5 W (average) from the
integrated amplifier. The USB interface supports full speed, and is USB 2.0 Audio Class
compliant for both control and data.
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.
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.
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
– Stereo beam-forming
– Noise reduction
– Dynamic loudness adaptor
– Mic auto gain control
– Digital equalizer (10 bands/channel)
– Dynamic range compression
• USB 2.0 Audio Class compliant interface (full
speed data and control)
• One 2-wire I2C or 4-wire SPI slave, or UART interface for external MCU
• 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
Applications
• Unified Communication peripherals
– Headset
– Handset
– Desk Phone
– Speakerphone
– Conferencing System
Part Number CX20706
Description
Speakers-on-a-Chip with On-chip
Voice/Audio DSP, Integrated I2C/USB
Codec, and Mono Class-D Amplifier
Audio
Speakers-on-a-Chip
CX20706 Features
CODEC
• Compliant Microsoft Office Communicator peripheral
requirement
• Pass TIA-920 test requirement
• USB 2.0 Compliant Audio Class interface
• UART interface for external MCU
• Eight GPIO pins
• 2.5 W BTL Mono Class-D speaker amplifier
• Single-ended or differential stereo analog audio input
• Two microphones interfaces with on-chip bias supply
• Integrated 50 mW headphone driver with jack sense
• Single-ended or differential line out
• 24-bit DAC/ADC, SNR 102 dB, THD - 92 dB at 48 kHz 3.3 V
• Audio sample rate: 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48, 64,
88.2, 96 kHz
• 90 dB dynamic range with 0.01percent THD+N at 4 Ω load
• Spread Spectrum for filter-less, low EMI output
• 10-bit ADC multiplexed to support analog volume
potentiometer and DC level detection
SE or Diff Line In
SE Line In
SE or Diff Line In
M
M
3
ADC
3
ADC
DSP
Memory
DMA
DAC
Capless HP
Out 32 7
DAC
Capless HP
Out 32 7
DMA
M
Matrix 1
Matrix 0
Matrix 2
MON
ADC
Volume
Voltage
Monitor
EEPROM DATA
EEPROM CLK
TX
RX
UART
CSN
USB+
Sense
SPI
I2C Slave
USB
Jack
Sense
MISO
XTAL Out
SE or Diff
10 k7 line
Controller
Clock
Circuitry
SCL
XTAL In/
Master In
SE or Diff
10 k7 line
Bias
Generator
MOS/SDA
MIC Bus
GPIO 4
MIC Bus
GPIO 3
ADC
GPIO 1
MIC In
2.5 W Class-D
DSP
GPIO 2
ADC
GPIO 0
MIC In
USB-
SE Line In
SPoC Configuration Toolbox
• Fast configuration tool via USB-to-I2C from PC
• Device configuration and DSP parameter adjustment
• Output log for convenient MCU programming
M
M
M
SE or Diff Line In
DSP
• Subband acoustic echo suppression and cancellation
• Stereo beam-forming
• Noise reduction for inbound speech (far end) and outbound
speech (near end)
• Dynamic loudness adaptor
• Mic auto gain control
• Digital parametric equalizer (10 bands/channel)
• Dynamic range compression
USB Detect
SE or Diff Line In
• Flexible power management
• Variable master clock rates
CX20706 Interface Diagram
The CX20706 is offered in a 76-pin QFN package
Conexant Product Portfolio
Conexant’s comprehensive product portfolio includes solutions for imaging, audio, embedded modem and video surveillance applications.
© 2009 Conexant Systems, Inc. All Rights Reserved. Conexant and the Conexant
logo are registered trademarks of Conexant Systems, Inc. All other trademarks
are owned by their respective owners. Although Conexant strives for accuracy
in all its publications, this material may contain errors or omissions and is
subject to change without notice.
This material is provided AS IS and without
any express or implied warranties, including merchantability, fitness for a
particular purpose and non-infringement.
Conexant shall not be liable for any
special, indirect, incidental or consequential damages as a result of its use.
09-2911
www.conexant.com
General Information:
U.S. and Canada: (888) 855-4562
International: 1+ (949) 483-3000
Headquarters
4000 MacArthur Blvd.
Newport Beach, CA 92660
Doc# PBR-202454
Similar pages