CONEXANT CX20709

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 highperformance 102 dB SNR, 24-bit DACs for
2.1CH speaker output, capless headphone
output, and single-ended/differential lineoutput. The analog input paths feature four
high performance, 24-bit ADC supporting up
to four microphones or three stereo LineInputs. 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
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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
CX20709-EVK2
CX20709-EVK2
CX20709-21Z Evaluation Kit
CX20709-EVK2-IN
CX20709-EVK2-IN
CX20709-21Z Intercom Daughter Board
Not recommended for new design
All devices are lead-free (Pb Free) and RoHS compliant
Part Number CX20709
Description USB/I2S Audio CODEC, Audio/Voice DSP, Stereo Class-D, Headphone
Driver
CODEC Features
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LINE_IN_1L_LP (SE or Diff Line In)
M
Σ
ADC
Σ
ADC
M
MIC_IN2_L/LINE_IN_3L
LINE_IN_1R_RP (SE or Diff Line In)
M
LINE_IN_2R_RN (SE or Diff Line In)
M
DMIC_IN
DAC
KS2
DMA
Volume
VOLT_MON
NVDAT
NVCLK
UART_TX
UART
UART_RX
I2C_SPI_CSN
USB_DP
MON
ADC
SPI
I2C Slave
USB
I2S_PCM_2_TX_DAT
PASS_THRU
I2S_PCM_2_CLK/DMIC_CLK
I2S_PCM_2_RX_DAT/DMIC_IN/SPDIF_IN
PASS_THRU
I2S_PCM_2_WS
PCM/I2S
I2S_PCM_1_TX_DAT
I2S_PCM_1_TX_WS/SPDIF_OUT
I2S_PCM_1_CLK
I2S_PCM_1_RX_WS
PCM/I2S
MCLK
I2S_PCM_1_RX_DAT
Jack
Sense
CLASSD_RP
CLASSD_RN
(2.5W Class-D 4 Ω Out)
LINE_OUT_LP
LINE_OUT_LN
(SE or Diff, LINE_OUT_LN
10 kΩ line)
LINE_OUT_RP
LINE_OUT_RN
(SE or Diff, LINE_OUT_LN
10 kΩ line)
Controller
Bias
Generator
Clock
Circuitry
KS1
R
KS0
ADC
SENSE_A
HP_OUT_L
(Capless HP Out 32 Ω)
HP_OUT_R
(Capless HP Out 32 Ω)
CLASSD_LP
CLASSD_LN
(2.5W Class-D 4 Ω Out)
GPO4
MIC_IN_R
GPO 0
ADC
XTLO
DAC
DSP X2
MIC_IN_L
XTLI
DMA
Memory
DMA
L
DMIC_CLK
MICBIAS_L
MONO_OUT_P
(SE or Diff, 600 Ω or 10 kΩ line)
MONO_OUT_N
(SE or Diff, 600 Ω or 10 kΩ line)
DAC
M
MIC_IN2_R/LINE_IN_3R
MICBIAS_R
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Dual Microphone Beam Forming
Noise Reduction
Dynamic Loudness Adaptor
Microphone Automatic Gain
Control
– Subband Line Echo Cancellation
(2-way intercom applications)
– Digital Equalizer (10 bands/
channel)
– Dynamic Range Compression
– 4th Order Digital Crossover for
Subwoofer Line-out
– Conexant sound-bar algorithm for
USB 5.1 channel sound-bar
enhancement (available in
CX20709-21Z)
SPoC Configuration Toolbox
– Fast configuration via USB-to-I2C
from PC
– Data path, I/O setup, and DSP
parameter adjustment
– Output log for convenient MCU
programming
M
LINE_IN_2L_LN (SE or Diff Line In)
I2C_EN/MCLK
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GPO3
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SPI_MISO
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GPO2
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I2C_SPI_SCL
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I2C_SDA/SPI_MOSI
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GPO 1
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USB_DM
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4-wire and 5-wire digital audio I/O (I2S/
PCM/SPDIF), supporting full duplex
independent sampling rates, master
clock for optional PCM/I2S slave codec
(SPDIF-in available in CX20709-21Z)
One 2-wire I2C and one 4-wire SPI
slave interface for external MCU
USB 2.0 Compliant full speed UAC
Interface
Supporting dual USB playback end
points (available in CX20709-21Z)
Stereo Digital Microphone, up to
12 MHz clock rate (available in
CX20709-21Z)
Eight GPIO pins
2.8 W x 2 BTL filter-less stereo ClassD Speaker Amplifier
– Low EMI Class-D amplifier output
with Spread Spectrum and
common mode scrambler
Integrated 50 mW headphone driver
with jack sense
Single-ended or differential line output
USB_5VDET
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–
–
–
Separate mixed mono line-output for
sub-woofer or intercom usage
Three single-ended stereo or one
differential stereo analog audio input
Up to 4 microphone interfaces with onchip bias supply (available in
CX20709-21Z)
24-bit DAC/ADC, SNR 102 dB, THD 92 dB at 48 kHz 3.3 V
– In DSP mode, the processing will
be limited the input and output to
16-bit effective resolution
Audio sample rate: 8,16, 22.05, 24, 32,
44.1, 48, 88.2, 96 kHz
90 dB Dynamic Range with 0.1%
THD+N at 4 Ω load
12-bit ADC multiplexed to support
analog volume potentiometer and DC
level detection
Flexible Power Management
Variable master clock rates
Configurable On-Chip proprietary
Voice/Audio Processing
– Subband Acoustic Echo
Cancellation
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Functional Block Diagram
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as a result of its use.
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Doc# PBR-202964
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