Audio
Speakers-on-a-Chip
cx20704 features
CODEC
• 5-wire digital audio I/O (I2S/PCM/SPDIF), supporting full duplex
independent sampling rates
• One 2-wire I
2C or 4-wire SPI slave interface for external MCU
• Eight GPIO pins
• 2.5 W mono Class-D speaker amplifier
• Single-ended or differential stereo analog audio input
• One microphone interface with on-chip bias supply
• Integrated 50 mW headphone driver with jack sense
• Single-ended or differential line out
• 24-bit DAC/four 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
• Flexible power management
• Variable master clock rates
DSP
• Subband acoustic echo suppression and cancellation
• Noise reduction
• Dynamic loudness adaptor
• Mic auto gain control
• Digital parametric equalizer (10 bands/channel)
• Dynamic range compression
• 3D Expander (Phantom mode and Immersion mode)
SPoC Configuration Toolbox
• Fast configuration tool via USB-to-I
2C from PC
• Device configuration and DSP parameter adjustment
• Output log for convenient MCU programming
SE or Diff Line In
SE or Diff Line In
M
M
ADC
DSP
SE or Diff Line In
SE or Diff Line In
M
M
DAC
ADC
DMA
Memory
Capless HP
Out 32
W
Capless HP
Out 32
W
DMA
DAC
MIC In
DSP
ADC
Matrix 0
Matrix 1
Matrix 2
2.5 W Class-D
GPIO 0
GPIO 1
GPIO 2
GPIO 3
GPIO 4
MIC Bias
Bias
Generator
Controller
SE or Diff
10K Line
SE or Diff
10K Line
XTAL In/
Master In
XTAL Out
Sense
Clock
Circuitry
Jack
Sense
DMA
PCM/I
2
S
SPI
I C Slave
2
UART
MON
ADC
Volume
Voltage
Monitor
CLK
SDA/MOSI
MSO
CSN
RX
RX_WS
SSCL
TX
EEPROM CLK
CX20704 Interface Diagram
The CX20704 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.
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subject to change without notice.
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Doc# PBR-202453
special, indirect, incidental or consequential damages as a result of its use.
09-2910
EEPROM DATA
RX_DAT
TX_WS/SPDIF
TX_DAT
CONEXANT [ CONEXANT SYSTEMS, INC ]
