CX20709 Datasheet, PDF (1/2 Pages) Conexant Systems, Inc – Eight GPIO pins

CX20709
USB/I²S Audio CODEC, Audio/Voice DSP, Stereo Class-D, Headphone
Driver
Overview
The CX20709 is one of Conexant's Audio/
Voice DSP CODEC family solutions with
highly integrated hardware DSP, CODEC,
Class-D amplifier, USB, I²S, S/PDIF, and
I²C interfaces. The solution features a suite
of turnkey audio and voice enhancement
algorithms designed for convergence audio
entertainment and voice communication
applications, such as PC Docking System/
Sound-Bar, Portable Multimedia/Navigation
Devices, Smart Home Intercom System,
Media IP Phone, and Unified
Communication Peripherals.
The CX20709 offers multiple digital data
and control I/O for flexible peripheral or
MCU/ MPU connectivity. The device
features one 4-wire and one 5-wire digital
audio interface, which can be mixed or
multiplexed to support bi-directional I²S,
PCM, and S/PDIF. The device can be
controlled and configured by both read and
write capability through I²C and SPI. The
device features a USB 2.0 Compliant Audio
Class interface (full-speed for data and
control) and a UART interface for the
external MCU/MPU interface.
The device integrates three high-
performance 102 dB SNR, 24-bit DACs for
2.1CH speaker output, capless headphone
output, and single-ended/differential line-
output. The analog input paths feature four
high performance, 24-bit ADC supporting up
to four microphones or three stereo Line-
Inputs. 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
integrated Class-D stereo amplifier operates
at 5 V or 3.3 V with an optional maximum
power of 2.8 W at a 4 Ω load. For intercom
application, the mono line-out supports
600 Ω drivers, which can drive the isolation
transformer directly without an external
operational amplifier.
The on-chip DSP is designed to run a suite
of Voice Processing Algorithms and Audio
Post Processing Effects offered by
Conexant. The device features Conexant's
soundbar algorithm for USB 5.1 channel
sound-bar enhancement. The audio
designer has the ability to adjust and
optimize performance on the target system
by using the SPoC Configuration Toolbox.
The CX20709 operates at supply voltages
down to 3.3 V for analog and 1.8 V for the
digital core. An advanced power
management scheme can be configured to
achieve <7.55 mW in sleep mode.
Applications
‹ PC Speakers System
‹ LCD Display/SoundBar
‹ Home Automation/Intercom
‹ PND/PMP
‹ Multi Media IP Phone
‹ Telepresence/Unified Communication
Device
‹ Embedded Applications
Ordering
Number
Part Number Package
Description
DSAC-L709-21CH CX20709-21Z
76QFN
DSAC-L709-12CH CX20709-12Z
76QFN
Not recommended for new design
CX20709-EVK2 CX20709-EVK2
CX20709-21Z Evaluation Kit
CX20709-EVK2-IN CX20709-EVK2-IN
CX20709-21Z Intercom Daughter Board
All devices are lead-free (Pb Free) and RoHS compliant
Part Number CX20709
Description USB/I²S Audio CODEC, Au-
dio/Voice DSP, Stereo Class-D, Headphone
Driver