Datasheet - Conexant

CX20723 Ultra Low-Power I2S/I2C Audio
CODEC
Data Sheet
General Description
Features
Conexant's CX20723 is an ultra low-power, high
performance audio Coder-Decoder (CODEC) that
supports Integrated Interchip Sound (I2S)/Inter-Integrated
Circuit (I2C) host interfaces. The I2S interface includes
Time-Division Multiplexing (TDM) support for
simultaneous multi-channel operation, and Acoustic Echo
Canceler (AEC) reference channels. Host interface
signaling levels of 1.5V, 1.8V, and 3.3V are selectable.
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With two 24-bit stereo Digital-to-Analog Converters
(DACs) operating at sampling frequencies up to 192kHz
and two 24-bit stereo Analog-to-Digital Converters
(ADCs) operating up to 96kHz, the CODEC supports
multi-streaming and Real-Time Communication (RTC)
applications. By combining these hardware features with
Conexant's playback, voice, and speech pre-processing
algorithms, this CODEC is the ideal solution for platforms
needing Lync and Skype, general consumer applications,
and high-end gaming/multi-media enthusiasts.
The CX20723 has an integrated stereo AudioSmart™
class-D with intelligent power delivery and dynamic signal
loudness optimization. SpeakerShield technology
provides industry-leading, load-based protection in realtime that includes Direct Current (DC) detection, shortcircuit, near-short, high temperature, and overtemperature. Integrated 14-band hardware Equalizer
(EQ) and Dynamic Range Compression (DRC) optimizes
speaker frequency response and loudness without
distortion. The EQ can also be applied to the headphone
and line out paths. A four-band hardware EQ is available
on the microphone inputs. Additional unlimited bands of
EQ and DRC are available in software.
The CODEC includes a stereo capless headphone output
and a headset with integrated detect and switch without
an external Bill Of Materials (BOM). A universal jack
supports all audio peripherals on one jack. A mono
subwoofer output is available with tunable EQ, as well as
line-out/line-in/microphone re-tasking.
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Host interface supports 1.5V, 1.8V, or 3.3V signaling
levels
Two pairs of independent DACs and ADCs have
independent sampling rates up to:
– 192kHz for DACs
– 96kHz for ADCs
2.8WRMS per channel AudioSmart™ class-D with
intelligent power delivery and dynamic signal loudness
optimization
Integrated seven bands per channel EQ and DRC
SpeakerShield best industry advanced speaker
protection
Fully integrated headset support with detect/switch—
universal audio jack
Four digital microphones for array applications
Tunable microphone EQ
Mono subwoofer output with a dedicated EQ
Input/output re-tasking port for docking applications
Line-in is available for scalar board interfaces
S/PDIF output supports rates up to 96kHz
D3 Live allows external device playback through an
internal speaker with full dynamics and protection
while the system is asleep
Bi-directional EAPD and GPIOs
Supports analog and digital PC Beep
System Compatibility
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I2S for audio streaming and I2C for control
Windows 8.x/10
Linux
Android
Up to four digital microphones can be connected. Multiple
General Purpose Input/Outputs (GPIOs) are available, as
well as a bi-directional External Amplifier Power-Down
(EAPD). The CODEC also includes a Sony/Philips Digital
Interface Format (S/PDIF) output.
05/26/15
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010-23DSR04
CX20723 Data Sheet
Revision History
Revision History
Document No.
Release Date Change Description
010-23DSR04
05/26/15
Updated:
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"System Compatibility."
"Introduction."
"CX20723 Block Diagram" figure.
"Analog Performance" table.
"Power Consumption" table.
010-23DSR03
11/13/14
Updated "Device Performance Specifications."
010-23DSR02
11/05/14
Updated:
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"Features."
"Introduction."
"CX20723 Audio CODEC Features."
"Pin Assignments" table.
"Analog Performance" table.
"Power Consumption" table.
Updated "Features."
Added "I2C Interface."
010-23DSR01
09/15/14
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010-23DSR00
09/04/14
Initial release.
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CX20723 Data Sheet
Table of Contents
Table of Contents
General Description.......................................................................................................................................................i
Features..........................................................................................................................................................................i
System Compatibility ....................................................................................................................................................i
Revision History ...........................................................................................................................................................ii
Introduction...................................................................................................................................................................1
CX20723 Audio CODEC Features................................................................................................................................2
Hardware Interface .......................................................................................................................................................5
General ................................................................................................................................................................................. 5
Host Interface ............................................................................................................................................................. 5
Audio Ports ................................................................................................................................................................. 5
Block Diagram...................................................................................................................................................................... 6
Pin Information .................................................................................................................................................................... 7
Pin Configuration ........................................................................................................................................................ 7
Pin Assignments ......................................................................................................................................................... 8
Device Performance Specifications................................................................................................................................. 10
Power Consumption.......................................................................................................................................................... 12
Package Dimensions..................................................................................................................................................13
Inter-Integrated Circuit (I2C) Interface ......................................................................................................................14
Ordering Information..................................................................................................................................................15
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CX20723 Data Sheet
List of Figures
List of Figures
Figure 1: CX20723 Block Diagram ................................................................................................................................................... 6
Figure 2: CX20723 Pin Configuration ............................................................................................................................................... 7
Figure 3: Package Diagram ............................................................................................................................................................ 13
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CX20723 Data Sheet
List of Tables
List of Tables
Table 1: Pin Assignments ................................................................................................................................................................. 8
Table 2: Analog Performance ......................................................................................................................................................... 10
Table 3: Power Consumption.......................................................................................................................................................... 12
Table 4: Ordering Information......................................................................................................................................................... 15
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CX20723 Data Sheet
Introduction
Introduction
Conexant's CX20723 is an ultra low-power, high performance audio CODEC that supports I2S for audio
streaming and I2C for control. The I2S interface includes TDM support for simultaneous multi-channel
operation, and AEC reference channels. The host interface signaling level of 1.5V, 1.8V, and 3.3V is
selectable.
With two 24-bit stereo DACs operating at sampling frequencies up to 192kHz and two 24-bit stereo ADCs
operating up to 96kHz, the CODEC supports multi-streaming and RTC applications. By combining these
hardware features with Conexant's playback, voice, and speech pre-processing algorithms, this CODEC is
the ideal solution for Enterprise platforms needing Lync and Skype, general consumer applications, and
gaming/multi-media enthusiasts.
The CX20723 has an integrated stereo AudioSmart™ class-D with intelligent power delivery and dynamic
signal loudness optimization that is capable of driving up to 2.8WRMS per channel into 4 loads.
SpeakerShield technology provides industry-leading, load-based protection in real-time that includes DC
detection, short-circuit, near-short, high temperature, and over-temperature. Integrated 14-band hardware
EQ and DRC optimizes speaker response and loudness without distortion to enable a high-quality audio
experience on integrated speakers that are independent of a driver and an Operating System (OS). The
EQ can also be applied to the headphone and line out paths. A four-band hardware EQ is available on the
microphone inputs. Additional unlimited bands of EQ and DRC are available in software.
ProCoustic capless headphone driver produces a full-range frequency response, and eliminates
Alternating Current (AC) coupling capacitors. Integrated headset support with auto-detect and auto-switch
between Apple and Nokia-style headsets eliminates all external BOM. In-line headset button command
sensing enables control of third-party applications directly from the headset, or simply allows the user to
wake the system from the headset. A single universal jack supports headsets, headphones, external
microphones, and line-in devices.
A re-tasking line-in/Mic/line-out port can be used for multi-function jacks, analog dock interfaces, and
connection to speaker amplifiers for higher power and for multi-speaker systems. The line-in offers a HighDefinition Multimedia Interface (HDMI) scalar board interface for AIO applications. A bi-directional EAPD
feature allows external amplifier power control in addition to Embedded Controller (EC)/chipset control of
the CODEC class-D and HP amplifiers without adding an external BOM or system design complexity. A
mono subwoofer output includes a two-band programmable band-pass filter for best speaker matching
and it can be bypassed to drive full frequency into the subwoofer, if needed. The D3-Live mode enables
external audio devices to play through an input or a universal jack to the internal speakers with full speaker
EQ/DRC, while in system is in connected standby, low power, and sleep modes.
Up to four digital microphones can be connected with integrated boost and DC offset removal. Together
with Conexant's AudioSmart voice and speech input processing technologies, this device supports all
convertible, detachable, and tablet microphone configurations, including two-user facing and two-world
facing microphones. Each stereo pair has its own programmable clock output that can be individually
enabled, and can be programmed for low frequency modes to minimize power consumption. An S/PDIF
output is available that supports sample rates up to 96kHz. Multiple GPIOs are also available, including
configurable host interrupt.
Conexant's PopShield technology eliminates pops and clicks during all transition states. This technology
includes active DC offset removal ground calibration and innovative Vref ramping schemes to avoid pops
on AC-coupled paths. The CX20723 has D-Flex power management that exceeds industry power
requirements, and consumes minimum power during a connected standby and all low-power system
states without pops or clicks. In its non-active lowest power state, the CODEC consumes less than 275μW.
A headset center button and jack plug-in event wake-up is supported.
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CX20723 Data Sheet
CX20723 Audio CODEC Features
Conexant offers comprehensive audio software driver support, with both in-house and third-party software
APOs, including Andrea Electronics, Creative Labs, Dolby, DTS, Sonic Focus, MaxxAudio, Waves, and
more. Conexant’s AudioSmart voice and speech processing algorithm suite ensures clear voice
communication and speech command and control in noisy environments. The Smart Source Pickup (SSP)
does not rely on beam-forming techniques, and provides an easy to use powerful solution that requires few
or no user controls. The SSP passes the latest Intel ASR certification and Cortana in portrait and
landscape modes with just two microphones, and is available for Windows, Linux, and Android.
AudioSmart also offers keystroke, screen tapping, and fan noise suppression.
CX20723 Audio CODEC Features
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Two pairs of independent DACs and ADCs have independent sampling rates up to:
– 192kHz for DACs
– 96kHz for ADCs
2.8WRMS per channel stereo class-D with spread spectrum and common mode scrambling to reduce
Electro-Magnetic Interference (EMI)
AudioSmart™ class-D intelligent power delivery and dynamic signal loudness optimization maximizes
even small speaker Sound Pressure Level (SPL) and ensures no speaker damage
EQ and DRC:
– Integrated 14-band hardware programmable EQ ensures optimal speaker frequency response
– DRC maximizes loudness while preventing distortion
– EQ can be applied to headphone and line-out paths
– Four-band microphone EQ
– Two-band EQ on the subwoofer output
– Additional unlimited bands of EQ and DRC are available in the software
SpeakerShield technology provides real-time, load-based class-D speaker protection that is
independent of driver and application—programmable by Basic Input/Output System (BIOS) and
includes:
– Programmable High-Pass Filter (HPF) protects speakers against damage from high energy, low
frequency content
– DC protection detects DC voltage across the speakers and prevents damage by immediately
shutting down the class-D amplifier
– Short circuit protects against straight shorts to ground that can happen during manufacturing
– When near-shorts are detected, the amplifier gain adjusts to auto recover and shuts it down if the
problem persists
– Very high temperature conditions immediately shut off the amplifier
– High temperature throttles down the class-D gain to auto recover, or shuts it down if the problem
persists
– Class-D voltage supplies, presence, and accuracy of DAC and class-D clocks are carefully
monitored
A stereo ProCoustic capless headphone driver delivers more than 20mW into 32 loads with no pops,
and eliminates the BOM cost and space of external headphone amplifiers and DC-blocking capacitors
Built-in, four-conductor headset jack supports headphone/headset auto-detection, as well as autoswitching between Apple and Nokia-style headsets without any external components
Headset in-line command sensing is supported for system wake or application control from a headset
button
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CX20723 Data Sheet
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CX20723 Audio CODEC Features
Eliminates external powered speaker hum noise while the system is off—a fully integrated feature that
requires no external components
Universal audio jack supports all headsets, headphones, external microphones, and external line-in
devices on one jack
A mono subwoofer output includes a two-band programmable band-pass filter that can be bypassed to
drive full frequency into the subwoofer—works with the class driver
Input/Output (I/O) re-tasking port enables multi-function jacks, analog dock interfacing, and external
amplifiers for higher powered speakers and systems with more than two internal speakers
A line input provides an interface for HDMI scalar boards and analog docks
Digital Microphone Interface (DMIC) with DC offset removal and programmable boost supports up to
four digital microphone elements. Two fully synchronous programmable clock outputs are available to
control the DMIC in stereo pairs or all together. Low clock frequencies are available for low-power
operation of DMIC modules. The DMIC interface signaling can run at 1.8V or 3.3V.
S/PDIF output supports rates up to 96kHz
Record security prevents unwanted recordings from all or selected input ports
Two-band microphone EQ helps hardware compensation for Skype and Lync certification—additional
EQ bands are available in software
Integrated headphone limiter supports GS Mark EN50332-2 without an external BOM—selectable
through BIOS or a driver/GUI
Supports analog and digital PC Beep—Wake-on-Beep never misses a beep, even when in low-power
mode
Multiple GPIOs are available for custom applications, and can be selected for 1.8V or 3.3V signaling
levels
Bi-directional EAPD supports external amplifier control for power savings as well as integrated HP and
class-D amplifier shutdown/mute on a single pin—avoids external BOM cost and design complexity
Integrated Low Drop-Outs (LDOs) provide on-chip clean rails and clean Microphone Bias (micbias)
Supports 1.5V, 1.8V, and 3.3V host interface signaling levels
Pop Shield II enhanced pop and click suppression on all ports
Jack sense detects jack plug events
An integrated digital mixer is used to record what is playing pre-EQ, so recorded audio sounds great
on all devices and peripherals
D3 Live allows external audio devices to play to the internal speakers, with full hardware EQ and DRC
while the system is asleep or in low power modes—use your notebook as a speaker dock
CODEC consumes less than 275μW in it lowest power state
Supports ultra-low power headphone playback
Available in a 50-pin, thermally-enhanced QFN package
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CX20723 Data Sheet
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CX20723 Audio CODEC Features
AudioSmart speech/voice pre-processing algorithms are available from Conexant, including:
– End-to-end noise reduction
– True stereo AEC
– SSP solves common, real-world problems, and works much better than traditional beam-forming
noise reduction approaches—works in all orientations (portrait, landscape, LCD panel flat on a
table, tent style, etc.) with stereo microphone only and without user control changes
– Best-in-class keystroke suppression, tap suppression, and fan noise suppression solutions
– Maximize hit rates for speech recognition applications—solution ensures near flawless hit rates
while other processing like keystroke suppression and VOIP enhancements remain enabled
simultaneously
– Far Field Pickup enables far field speakerphone and multi-speaker group conference call
applications
10-band graphic EQ:
– Provides additional, user-controlled, enhancements and pre-sets
– Night mode boosts vocal clarity while maintaining background sound quality
Multi-band dynamic EQ (multi-band DRC) improves the sound quality of low-cost speakers and
prevents speaker rattle and distortion—allows different threshold tuning on different frequency bands
Phantom bass psycho-acoustic technology creates virtual bass content on mainstream speakers
3D:
– Expander widens the audio stage for a fuller and richer sound
– Headphones recreates a surround sound, speaker-like environment in headphones so users can
enjoy a richer and fuller music listening experience
SmartAudio GUI—advanced audio control panel
Audio director for classic and multi-stream selections
Third-party software support includes, but is not limited to:
– Creative Labs
– Dolby
– DTS, Inc.
– ForteMedia
– Andrea Electronics
– Waves
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CX20723 Data Sheet
Hardware Interface
Hardware Interface
General
Host Interface
The host interface supports the following common set of signals:
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I2S:
– MCLK, master clock, input
– BCLK, data bit clock, input (slave), output (master)
– LRCLK, left/right clock, input (slave), output (master)
– ADCDAT, transmit data, output
– DACDAT, receive data, input
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I2C:
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SCL, serial clock, input
SDA, serial data, input/output
Audio Ports
The following lists the supported audio interface signals:
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Port A (PORTA_L and PORTA_R), capless headphone output/line output, headset
Port B (PORTB_L and PORTB_R), microphone input/line input with micbias
Port C (DMIC_CLK, DMIC_DATA), stereo digital microphone input
Port D (PortD_A, PortD_B), analog headset mono microphone input (supports Apple/Nokia-style
headset auto-detection and auto-switching with no BOM)
Port E (PORTE_L, PORTE_R), stereo Line output, re-taskable as microphone or line-in
Port F (PORTF_L, PORTF_R)l stereo line input
Port G (Left+ and Right+), class-D speaker amplifier output, stereo/mono selectable
Port H (DMIC_CLK, DMIC_DATA), stereo digital microphone input
Port I, S/PDIF output
Port M, mono analog output for subwoofer
PC speaker beep pass-through (PC_BEEP), input
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CX20723 Data Sheet
Block Diagram
Block Diagram
The following figure shows the CX20723 block diagram.
EAPD/#SPKMUTE
#SPKMUTE/GPIO
Music REQ/GPIO
Port B Micbias
Port E Micbias
Line-In/MIC
Boost
Jack
Port B
ADC
Boost
Micbias D
MIC-In
Port D
2.2K
Headphone Ground 1
Headphone Ground 2
Beep
DAC1
Ȉ
DAC2
Boost
ADC
Line-Out
Line-In/MIC
Jack
Port E
Boost
Line-In
Jack
Port F
Port C
Boost
Digital Mic
I2S/I2C
Port H
Boost
Digital Mic
DATA1
CLOCK1
Internal
DATA2/GPIO1
CLOCK2
Beep
Ȉ
HP/BP
Ȉ
Mono Out
Port M
EQ/
DRC/
HPF
DAC
HP Line-Out
Ȉ
Jack
Port A
EQ/
DRC/
HPF
CLASS_D Amp
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DAC
Internal
Port G
Sense A (Port A, B, E, F)
Jack
S/PDIF/GPIO
DAC
Port I
Figure 1: CX20723 Block Diagram
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CX20723 Data Sheet
Pin Information
Pin Information
Pin Configuration
The following figure shows the CX20723 pin configuration.
Figure 2: CX20723 Pin Configuration
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CX20723 Data Sheet
Pin Information
Pin Assignments
The following table lists the CX20723 pin assignments.
Note: No Connect = NC.
Table 1: Pin Assignments
Pad
Number Signal Name
1
DACDAT. I2S receive data and CODEC data
input for playback.
2
MCLK. I2S master clock input to the
CODEC.
3
VDDIO—1.5V/1.8V/3.3V, ±5%. Sets the host
interface signaling level. Connect to the
same power supply as the host bus
controller.
4
SCL. I2C serial clock input.
Pad
Number Signal Name
26
PORTA_RIGHT. Capless headphone output,
right channel.
27
PORTM. Mono subwoofer output.
28
PORTE_LEFT. Line-in/line-out/microphonein, left channel.
29
5
SDA. I2C serial data input/output.
30
6
MUSIC_REQ/SPDIF/GPIO0. Multi-function
pin.
31
PORTE_RIGHT. Line-in/line-out/
microphone-in, right channel.
HGNDA. Microphone:
• Ground terminal for CTIA-style headsets.
• Bias for Open Mobile Terminal Platform
(OMTP) style headsets.
HGNDB. Microphone:
• Ground terminal for OMTP-style
headsets.
• Bias for CTIA-style headsets.
MUSIC_REQ. Pull high by the external
controller to enable D3 Live Mode.
SPDIF. S/PDIF output.
7
GPIO0. GPIO.
SPKR_ MUTE#/GPIO1. Multi-function pin.
32
VREF_DAC. Analog Ground (AGND)
reference—connect directly to AGND.
33
VREFP (Analog Reference). AGND
reference—connect to AGND through a
capacitor (typically 1μF).
34
AVDD5. 5V ±10%. LDO voltage supply input
to the CODEC.
35
PORTD_A.
• Headset microphone input.
• Mono microphone input for CTIA style
headsets.
SPKR_MUTE. When pulled low, holds
class-D on mute. Instead, Conexant
recommends using a bi-directional EAPD pin.
8
GPIO1. GPIO.
PORTC, DMIC DATA 1/GPIO3. Multifunction pin.
DMIC DATA 1. An input to the CODEC—the
digital MIC data from one or two DMICs.
9
10
GPIO3. GPIO.
DVDD_IO. Sets the:
• Digital I/O level. Connect to 1.8V/3.3V, ±5%.
• Signaling level for the DMIC, S/PDIF,
EAPD, and GPIO.
PORTC, DMIC_CLK 1/GPIO2. Multifunction pin.
DMIC_CLK 1. Output from the CODEC—the
digital MIC clock.
GPIO2. GPIO.
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CX20723 Data Sheet
Pin Information
Pad
Number Signal Name
11
Bi-directional EAPD. Bi-directional pin,
Refer to the reference schematics for details.
Output. Controls the external amplifiers’
power up/down per the HD Audio
Specification.
12
Input. Can be driven by EC or such to mute
class-D and headphones.
PORTH, DMIC_CLK 2/GPIO4. Multifunction pin.
Pad
Number Signal Name
36
PORTD_B.
• Headset microphone input.
• Mono microphone input for OMTP style
headsets.
37
MICBIAS_E. Programmable micbias output
for port E.
38
MICBIAS_B. Programmable micbias output
for port B.
39
PORTB_L. Microphone/line-in port, left
channel.
PORTB_R. Microphone/line-in port, right
channel.
DMIC_CLK 2. Output from the CODEC—the
digital MIC clock for second pair of DMICs.
13
GPIO4: GPIO.
PORTH, DMIC DATA 2/GPIO5. Multifunction pin.
DMIC DATA 2. Input to the CODEC—the
digital MIC data from third and fourth DMICs.
14
15
16
17
18
GPIO5. GPIO.
PORTG, Class D LEFT +. Class-D amplifier
output, left channel, positive.
PVDD5 LEFT, 5V ±10%. Class-D left power
supply voltage. Connect to PVDD5 RIGHT,
and connect both to system 5V.
PORTG, Class D LEFT -. Class-D amplifier
output, left channel, negative.
PORTG, Class D RIGHT -. Class-D
amplifier output, right channel, negative.
PVDD5 RIGHT, +5V ±10%. Connect to
PVDD5 LEFT, and connect both to system
5V.
40
41
PORTF_L. Line-in port, left channel.
42
PORTF_R. Line-in port, right channel.
43
JSENSE. Jack sense input. Connect to the
resistor network per the HD Audio
Specification. Refer to the reference
schematic for details.
PC BEEP. PC speaker beep input. Needs to be
AC-coupled using a 0.1μF capacitor. Maximum
input level is 1.8V. Use external attenuator if
using a 3.3V signal to drive this pin.
LDO_AVDD. 1.8V to 1.6V LDO output.
Connect to AGND through a capacitor.
VDD18. 1.8V ±5%. Analog supply voltage
input to the CODEC.
19
PORTG, Class D RIGHT +. Class-D
amplifier output, right channel, positive.
44
20
CP_AVDD18, 1.8V, ±5%. Charge pump
supply input.
FLY_P, Flying Capacitor. Charge pump
positive transfer charge—connect to FLY_N
through a 2.2mF capacitor.
FLY_N, Flying Capacitor. Charge pump
negative transfer charge—connect to FLY_P
through a 2.2mF capacitor.
CP_VNEG. Charge pump negative rail
output—connect to digital ground through a
2.2μF capacitor.
CP_VPOS. Charge pump positive rail
output—connect to digital ground through a
2.2μF capacitor.
PORTA_L. Capless headphone output, left
channel.
45
21
22
23
24
25
46
47
LDO_VDD_CORE, 1.2V LDO output.
Connect to digital GND through a capacitor.
48
BCLK. I2S bit clock—CODEC input (slave)
and CODEC output (master).
49
LRCLK. I2S left/right clock—CODEC input
(slave) and CODEC output (master).
50
ADCDAT. I2S transmit data—CODEC data
output for record.
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CX20723 Data Sheet
Device Performance Specifications
Device Performance Specifications
Table 2 details the analog performance. The PSRR >85dB for all analog inputs and outputs.
Table 2: Analog Performance
Device Type
Requirement
Minimum
Typical
Maximum
Frequency Range
at 48kHz and
Above
THD+N @ –3dBFS
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90dBFS
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[20Hz, 20kHz]
Dynamic Range with
Signal Present
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104dBFS
Awt
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[20Hz, 20kHz]
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±0.25dB ripple (0.5dB [20Hz, 20kHz]
peak-to-peak delta)
1dB at upper band edge
3dB at lower band edge
Magnitude Response -
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Analog Line
Output Jack
Sampling Frequency
Accuracy
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0.02%
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Line Output Crosstalk -
83dB
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[20Hz, 15kHz]
Full-scale Output
Voltage
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1VRMS
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Noise Level During
System Activity
95dBFS Awt -
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Inter-channel Phase
Delay
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30 degrees or 12.5μs,
whichever is greater.
[20Hz, 20kHz]
THD+N @ –3dBFS
(1W 4)
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78dB
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[20Hz, 20kHz]
Dynamic Range with
Signal Present
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98dBFS Awt
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[20Hz, 20kHz]
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±0.25dB ripple (0.5dB [20Hz, 20kHz]
peak-to-peak delta)
1dB at upper band edge
3dB at lower band edge
Magnitude Response -
Speaker
Amplifier
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Sampling Frequency
Accuracy
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0.02%
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Crosstalk
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86dB
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[20Hz, 15kHz]
Noise Level During
System Activity
90dBFS Awt -
-
-
Inter-channel Phase
Delay
-
30 degrees or 12.5μs,
whichever is greater.
[20Hz, 20kHz]
-
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CX20723 Data Sheet
Device Performance Specifications
Table 2: Analog Performance (Continued)
Device Type
Requirement
Minimum
Typical
Maximum
Frequency Range
at 48kHz and
Above
THD+N @ –3dBFS/
10k
-
78dBFS
-
[100Hz, 20kHz]
THD+N @ –3dBFS/
32
-
91dBFS
-
[100Hz, 20kHz]
THD+N @ –3dBFS/
16
-
79dBFS
-
[100Hz, 20kHz]
Dynamic Range with
Signal Present, All
Loads
-
103dBFS
Awt
-
[100Hz, 20kHz]
-
•
±0.25dB ripple (0.5dB [100Hz, 20kHz]
peak-to-peak delta)
1dB at upper band edge
3dB at lower band edge
Magnitude Response -
Analog
Headphone
Out Jack
•
•
Sampling Frequency
Accuracy
-
-
0.02%
-
Headphone Output
Crosstalk (at Jack)
-
89dB
-
[100Hz, 15kHz]
Full-scale Output
Voltage, 10k Load
-
1VRMS
-
(3)
Full-scale Output
Voltage, 32 Load
-
820mVRMS
-
-
Noise Level During
95dBFS Awt System Activity 300
-
-
Noise Level During
System Activity 32
85dBFS Awt -
-
-
Inter-channel Phase
Delay
-
-
30 degrees or 12.5μs,
whichever is greater.
[100Hz, 20kHz]
THD+N @ –3dBFS
-
91dBFS
-
[20Hz, 20kHz]
Dynamic Range with
Signal Present
-
99dBFS Awt
-
[20Hz, 20kHz]
-
•
[20Hz, 20kHz]
<= ±0.25dB ripple
(0.5dB peak-to-peak
delta)
1dB at upper band edge
3dB at lower band edge
Magnitude Response Analog Line-In
Jack
•
•
Sampling Frequency
Accuracy
-
-
0.02%
-
Full-scale Input
Voltage
0.707VRMS
-
-
-
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CX20723 Data Sheet
Power Consumption
Table 2: Analog Performance (Continued)
Device Type
Requirement
Minimum
Typical
Maximum
Frequency Range
at 48kHz and
Above
THD+N @ –3dBFS
-
91dBFS
-
[100Hz, 20kHz]
Dynamic Range with
Signal Present
-
99dBFS Awt
-
[100Hz, 20kHz]
-
•
[100Hz, 20kHz]
<= ±0.25dB ripple
(0.5dB peak-to-peak
delta)
1dB at upper band edge
3dB at lower band edge
Magnitude Response Analog
Microphone-In
Jack
•
•
Sampling Frequency
Accuracy
-
-
0.02%
-
Full-scale Input
Voltage (0dB Boost)
0.707VRMS
-
-
-
Power Consumption
The following table lists the power consumption for the device.
Table 3: Power Consumption
Mode
Power
Non Active, Lowest Power State
<275μW
Headphone Playback into 32 Load (1mW)
27mW
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CX20723 Data Sheet
Package Dimensions
Package Dimensions
The following figure provides the CX20723 package diagram.
Figure 3: Package Diagram
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CX20723 Data Sheet
Inter-Integrated Circuit (I2C) Interface
Inter-Integrated Circuit (I2C) Interface
The I2C interface uses a:
•
•
7-bit slave address to address multiple slave devices attached to the same interface. The slave
address is static.
16-bit sub-address to access individual registers within the device.
Per convention, the I2C sub-address is transmitted immediately after the I2C slave address only during
write transfers. Data to be written to the addressed register(s) follows immediately after the sub-address.
By convention, read transfers use the sub-address established by the most recent write transfer. As a
result, a read transfer is typically preceded by a write transfer, which transmits only a sub-address value
with no data values. The read transfer then follows immediately after the write transfer.
The I2C interface supports clock speeds up to 400kHz, corresponding to the I2C fast mode. The I2C slave
address is 33 hex.
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CX20723 Data Sheet
Ordering Information
Ordering Information
Table 4: Ordering Information
Model/Order/Part Numbers
AudioSmart
Class-D
Operating
Temperature
Device
Order Number
Audio CODEC
Part Number
CX20723-11Z
CX20723
-11Z
50-QFN, 6x6
Yes
0 to 70°C
CX21723-11Z
CX21723
-11Z
50-QFN, 6x6
No
0 to 70°C
Revision
Audio CODEC
Package Type
Note: All devices are lead-free (Pb-free) and China Restriction of Hazardous Substances (RoHS)
compliant , and are compatible with leaded re-flow processes. Contact the local Conexant sales
office for advanced software options.
www.conexant.com
Headquarters: 1901 Main Street, Suite 300 Irvine, CA,92614
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© 2015 Conexant Systems, Inc.
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