Datasheet - Conexant

CX20721 Ultra Low-Power I2S/I2C Audio
CODEC
General Description
Features
Conexant's CX20721 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.
•
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 and voice and speech preprocessing algorithms, this CODEC is the ideal solution
for Enterprise platforms needing Lync and Skype, general
consumer applications, and high-end gaming/multi-media
enthusiasts.
The CX20721 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 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 path. A four-band hardware EQ is
available on the microphone inputs. Additional unlimited
bands of EQ and DRC are available in software.
•
•
•
•
•
•
•
•
•
•
•
Host interface supports 1.5V, 1.8V, or 3.3V signaling
levels
Two pairs of 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
and a universal audio jack
Stereo digital microphones for array applications
Tunable microphone EQ
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
•
•
•
•
I2S for audio streaming and I2C for control
Windows 8.x/10
Linux
Android
The CODEC includes 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 stereo Digital Microphone Interface (DMIC) supports
array applications. 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
Conexant Confidential • www.conexant.com
010-21DSR03
CX20721 Data Sheet
Revision History
Revision History
Document No.
Release Date Change Description
010-21DSR03
05/26/15
Updated:
•
•
•
•
•
•
010-21DSR02
01/05/15
Updated:
•
•
010-21DSR01
11/07/14
09/16/14
"CX20721 Block Diagram" figure.
"Device Performance Specifications."
Updated:
•
•
•
•
•
•
010-21DSR00
"System Compatibility."
"Introduction."
"CX20721 Audio CODEC Features."
"CX20721 Block Diagram" figure.
"Analog Performance" table.
"Power Consumption" table.
"Features."
"Introduction."
"CX20721 Audio CODEC Features."
"Pin Assignments" table.
"Analog Performance" table.
"Power Consumption" table.
Initial release.
Conexant Confidential
05/26/15
010-21DSR03
ii
CX20721 Data Sheet
Table of Contents
Table of Contents
General Description.......................................................................................................................................................i
Features..........................................................................................................................................................................i
System Compatibility ....................................................................................................................................................i
Revision History ...........................................................................................................................................................ii
Introduction...................................................................................................................................................................1
CX20721 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
Conexant Confidential
05/26/15
010-21DSR03
iii
CX20721 Data Sheet
List of Figures
List of Figures
Figure 1: CX20721 Block Diagram ................................................................................................................................................... 6
Figure 2: CX20721 Pin Configuration ............................................................................................................................................... 7
Figure 3: Package Diagram ............................................................................................................................................................ 13
Conexant Confidential
05/26/15
010-21DSR03
IV
CX20721 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
Conexant Confidential
05/26/15
010-21DSR03
V
CX20721 Data Sheet
Introduction
Introduction
Conexant's CX20721 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 levels of 1.5V, 1.8V, and 3.3V are
selectable.
The CX20721 has audio fidelity that exceeds Microsoft desktop and notebook premium logo requirements,
including Windows 8.1. 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 and voice and speech preprocessing algorithms, this CODEC is the ideal solution for Enterprise platforms needing Lync and Skype,
general consumer applications, and gaming/multi-media enthusiasts.
The CX20721 has an integrated stereo AudioSmart™ class-D 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 OS. The EQ can also be
applied to the headphone path. 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 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.
Stereo 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. The digital microphone clock is
programmable and supports low frequency modes to minimize power consumption. Multiple GPIOs and an
S/PDIF output that supports sample rates up to 96kHz are available. 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.
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 CX20721 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.
Less than 27mW headphone playback power consumption into 32 loads ensures maximum system
battery life. The headset center button and jack plug-in wake-up events are supported.
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.
Conexant Confidential
05/26/15
010-21DSR03
1
CX20721 Data Sheet
CX20721 Audio CODEC Features
CX20721 Audio CODEC Features
•
•
•
•
•
Two pairs of independent DACs and ADCs have independent sampling rates up to:
– 192kHz for DACs
– 96kHz for ADCs
2.8WRMS per channel AudioSmart 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 a headphone path
– Four-band microphone EQ
– 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
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
DMIC with DC offset removal and programmable boost supports a stereo digital microphone array.
Programmable clock outputs are available, including low frequency modes 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
–
•
•
•
•
•
•
•
•
Conexant Confidential
05/26/15
010-21DSR03
2
CX20721 Data Sheet
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
CX20721 Audio CODEC Features
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
headphone and class-D amplifier shutdown/mute on a single pin—avoids external BOM cost and
design complexity
CODEC supplies include 5V for class-D, and 1.8V for digital and headphone
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 into 32 of less than 27mW
Available in a 42-pin, thermally-enhanced QFN package
AudioSmart speech/voice pre-processing algorithms are available from Conexant:
– End-to-end noise reduction
– True stereo Acoustic Echo Canceler (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) with stereo microphone only and without user control changes
– Best-in-class keystroke suppression, tap suppression, and fan noise suppression solutions
– SSP optimizes hit rates for speech recognition applications like Nuance—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 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
Conexant Confidential
05/26/15
010-21DSR03
3
CX20721 Data Sheet
•
•
CX20721 Audio CODEC Features
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
Conexant Confidential
05/26/15
010-21DSR03
4
CX20721 Data Sheet
Hardware Interface
Hardware Interface
General
Host Interface
The host interface supports the following common set of signals:
•
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
•
I2C:
–
–
SCL, serial clock, input
SDA, serial data, input/output
Audio Ports
The following lists the supported audio interface signals:
•
•
•
•
•
•
•
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 G (Left+ and Right+), class-D speaker amplifier output, stereo/mono selectable
Port I, S/PDIF output
PC speaker beep pass-through (PC_BEEP), input
Conexant Confidential
05/26/15
010-21DSR03
5
CX20721 Data Sheet
Block Diagram
Block Diagram
The following figure shows the CX20721 block diagram.
EAPD/#SPKMUTE
#SPKMUTE/GPIO
Music REQ/GPIO
Port B Micbias
Boost
Line-In/MIC
Jack
Port B
ADC
Boost
Micbias D
MIC-In
Port D
2.2K
Headphone Ground 1
Headphone Ground 2
Port C
Boost
ADC
Digital Mic
DATA1
CLOCK1
Internal
I2S/I2C
Beep
EQ/
DRC/
HPF
DAC
HP Line-Out
Ȉ
Jack
Port A
EQ/
DRC/
HPF
CLASS_D Amp
Ȉ
DAC
Internal
Port G
Sense A
Jack
S/PDIF/GPIO
DAC
Port I
Figure 1: CX20721 Block Diagram
Conexant Confidential
05/26/15
010-21DSR03
6
CX20721 Data Sheet
Pin Information
Pin Information
Pin Configuration
The following figure shows the CX20721 pin configuration.
Figure 2: CX20721 Pin Configuration
Conexant Confidential
05/26/15
010-21DSR03
7
CX20721 Data Sheet
Pin Information
Pin Assignments
The following table lists the CX20721 pin assignments.
Table 1: Pin Assignments
Pad
Number Signal Name
Pad
Number Signal Name
1
DACDAT. I2S receive data and CODEC data
input for playback.
22
CP_VPOS. Charge pump positive rail
output—connect to the digital ground
through a 2.2μF capacitor.
2
MCLK. I2S master clock input to the
CODEC.
23
PORTA_L. Capless headphone output, left
channel.
3
HDA_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.
24
PORTA_RIGHT. Capless headphone output,
right channel.
4
SCL. I2C serial clock input.
25
HGNDA. Microphone:
• Ground terminal for CTIA-style headsets.
• Bias for OMTP-style headsets.
5
SDA. I2C serial data input/output.
26
HGNDB. Microphone:
• Ground terminal for Open Mobile Terminal
Platform (OMTP) style headsets.
• Bias for CTIA-style headsets.
6
MUSIC_REQ/SPDIF/GPIO0. Multi-function
pin.
27
VREF_DAC. Analog Ground (AGND)
reference—connect directly to AGND.
28
VREFP (Analog Reference). AGND
reference—connect to AGND through a
capacitor (typically 1μF).
29
AVDD5. 5V ±10%. LDO voltage supply input
to the CODEC.
MUSIC_REQ. Pull high by the external
controller to enable D3 Live Mode.
SPDIF. S/PDIF output.
GPIO0. GPIO.
7
SPKR_ MUTE#/GPIO1. Multi-function pin.
SPKR_MUTE. When pulled low, holds
class-D on mute. Instead, Conexant
recommends using a bi-directional EAPD pin.
GPIO1. GPIO.
8
PORTC, DMIC DATA 1/GPIO3. Multifunction pin.
DMIC DATA 1. An input to the CODEC—the
digital MIC data from one or two DMICs.
GPIO3. GPIO.
9
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.
30
PORTD_A.
• Headset microphone input.
• Mono microphone input for CTIA-style
headsets.
10
PORTC, DMIC_CLK 1/GPIO2. Multifunction pin.
31
PORTD_B.
• Headset microphone input.
• Mono microphone input for OMTP-style
headsets.
DMIC_CLK 1. Output from the CODEC—the
digital MIC clock.
GPIO2. GPIO.
Conexant Confidential
05/26/15
010-21DSR03
8
CX20721 Data Sheet
Pin Information
Pad
Number Signal Name
Pad
Number Signal Name
11
32
MICBIAS_B. Programmable micbias output
for port B.
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.
Input. Can be driven by EC or such to mute
class-D and headphones.
12
PORTG, Class D LEFT +. Class-D amplifier
output, left channel, positive.
33
PORTB_L. Microphone/line-in port, left
channel.
13
PVDD5 LEFT, 5V ±10%. Class-D left power
supply voltage. Connect to PVDD5 RIGHT,
and connect both to system 5V.
34
PORTB_R. Microphone/line-in port, right
channel.
14
PORTG, Class D LEFT -. Class-D amplifier
output, left channel, negative.
35
JSENSE. Jack sense input. Connect to the
resistor network per the HD Audio
Specification. Refer to the reference
schematic for details.
15
PORTG, Class D RIGHT -. Class-D
amplifier output, right channel, negative.
36
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.
16
PVDD5 RIGHT, +5V ±10%. Connect to
PVDD5 LEFT, and connect both to system
5V.
37
LDO_AVDD. 1.8V to 1.6V LDO output.
Connect to AGND through a capacitor.
17
PORTG, Class D RIGHT +. Class-D
amplifier output, right channel, positive.
38
VDD18. 1.8V ±5%. Analog supply voltage
input to the CODEC.
18
CP_AVDD18, 1.8V, ±5%. Charge pump
supply input.
39
LDO_VDD_CORE. 1.2V LDO output.
Connect to digital GND through a capacitor.
19
FLY_P, Flying Capacitor. Charge pump
positive transfer charge—connect to FLY_N
through a 2.2mF capacitor.
40
BCLK. I2S bit clock—CODEC input (slave)
and CODEC output (master).
20
FLY_N, Flying Capacitor. Charge pump
negative transfer charge—connect to FLY_P
through a 2.2mF capacitor.
41
LRCLK. I2S left/right clock—CODEC input
(slave) and CODEC output (master).
21
CP_VNEG. Charge pump negative rail
output—connect to digital ground through a
2.2μF capacitor.
42
ADCDAT. I2S transmit data—CODEC data
output for record.
Conexant Confidential
05/26/15
010-21DSR03
9
CX20721 Data Sheet
Device Performance Specifications
Device Performance Specifications
The following table details the analog performance.
Table 2: Analog Performance
Device Type
Requirement
Minimum
Typical
Maximum
Frequency Range
at 48kHz and
Above
THD+N @ –3dBFS
-
90dBFS
-
[20Hz, 20kHz]
Dynamic Range with
Signal Present
-
104dBFS
Awt
-
[20Hz, 20kHz]
-
•
±0.25dB ripple (0.5dB [20Hz, 20kHz]
peak-to-peak delta)
1dB at upper band edge
3dB at lower band edge
Magnitude Response -
•
•
Analog Line
Output Jack
Sampling Frequency
Accuracy
-
-
0.02%
-
Line Output Crosstalk -
83dB
-
[20Hz, 15kHz]
Full-scale Output
Voltage
-
1VRMS
-
-
Noise Level During
System Activity
95dBFS Awt -
-
-
Inter-channel Phase
Delay
-
-
30 degrees or 12.5μs,
whichever is greater.
[20Hz, 20kHz]
THD+N @ –3dBFS
(1W 4)
-
78dB
-
[20Hz, 20kHz]
Dynamic Range with
Signal Present
-
98dBFS Awt
-
[20Hz, 20kHz]
-
•
±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
•
•
Sampling Frequency
Accuracy
-
-
0.02%
-
Crosstalk
-
86dB
-
[20Hz, 15kHz]
Noise Level During
System Activity
90dBFS Awt -
-
-
Inter-channel Phase
Delay
-
30 degrees or 12.5μs,
whichever is greater.
[20Hz, 20kHz]
-
Conexant Confidential
05/26/15
010-21DSR03
10
CX20721 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
-
-
-
Conexant Confidential
05/26/15
010-21DSR03
11
CX20721 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
Conexant Confidential
05/26/15
010-21DSR03
12
CX20721 Data Sheet
Package Dimensions
Package Dimensions
The following figure provides the CX20721 package diagram.
Figure 3: Package Diagram
Conexant Confidential
05/26/15
010-21DSR03
13
CX20721 Data Sheet
Inter-Integrated Circuit (I2C) Interface
Inter-Integrated Circuit (I2C) Interface
The Inter-Integrated Circuit (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.
Conexant Confidential
05/26/15
010-21DSR03
14
CX20721 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
CX20721-11Z
CX20721
-11Z
42-QFN, 5x5
Yes
0 to 70°C
CX21721-11Z
CX21721
-11Z
42-QFN, 5x5
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
General Information: U.S. and Canada: 888-855-4562 | International: 1 + 949-483-3000
© 2015 Conexant Systems, Inc.
Information in this document is provided in connection with Conexant Systems, Inc. (“Conexant”) products. These materials are provided by
Conexant as a service to its customers and may be used for informational purposes only. Conexant assumes no responsibility for errors or
omissions in these materials. Conexant may make changes to this document at any time, without notice. Conexant advises all customers to
ensure that they have the latest version of this document and to verify, before placing orders, that information being relied on is current and
complete. Conexant makes no commitment to update the information and shall have no responsibility whatsoever for conflicts or
incompatibilities arising from future changes to its specifications and product descriptions.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in
Conexant’s Terms and Conditions of Sale for such products, Conexant assumes no liability whatsoever.
THESE MATERIALS ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, RELATING TO
SALE AND/OR USE OF CONEXANT PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A
PARTICULAR PURPOSE, CONSEQUENTIAL OR INCIDENTAL DAMAGES, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT,
COPYRIGHT, OR OTHER INTELLECTUAL PROPERTY RIGHT. CONEXANT FURTHER DOES NOT WARRANT THE ACCURACY OR
COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS, OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS.
CONEXANT SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS, WHICH MAY RESULT FROM THE USE OF THESE MATERIALS.
Conexant products are not intended for use in medical, lifesaving or life sustaining applications. Conexant customers using or selling Conexant
products for use in such applications do so at their own risk and agree to fully indemnify Conexant for any damages resulting from such
improper use or sale.
The following are trademarks of Conexant Systems, Inc.: Conexant®, the Conexant "C" logo, SmartAudio, and SmartDAA®. Product names or
services listed in this publication are for identification purposes only, and may be trademarks of third parties. Third-party brands and names are
the property of their respective owners. For additional disclaimer information, consult Conexant’s Legal Information posted at
www.conexant.com which is incorporated by reference.
Reader Response: Conexant strives to produce quality documentation and welcomes your feedback. Please send comments and suggestions
to [email protected] For technical questions, contact your local Conexant sales office or field applications engineer.
05/26/15
010-21DSR03
15