Synaptics(R) CX22721 I2S 2W CODEC AudioSmart(R) Product Brief The CX22721 features I2S audio I/O with I2C control, dedicated hardware DSP effects for speaker tuning, and an Acoustic Echo Canceler (AEC) reference output optimized for Synaptics Voice solutions. Dedicated hardware DSP capabilities enable a high-quality audio experience, especially as part of a closed-loop system with a Synaptics Voice Processor. This includes a 7-band/channel hardware EQ and a singleband DRC (with a single knee) which, independent of any host-based effects, can be combined to optimize speaker response and increase device loudness while simultaneously minimizing distortion. The CX22721 provides 2W per channel output with 1% distortion at 5V PVDD with a 4 speaker, and 1.3W per channel output with an 8 speaker. The ClassD amplifier uses programmable signal dynamics management and poweraveraging technology to safely maximize sound pressure level. A programmable high-pass filter on the Class-D output removes DC offset from the I2S audio channels, protecting the speakers from overheating. The Synaptics SpeakerShield provides industry-leading, real-time protection with features including load-based DC detection, short-circuit, near-short, high temperature, and over-temperature protection. The device also supports a highquality Line Out port with Headphone Drive capability. Key Features High Performance Stereo Class-D Amplifier for Advanced In-Air Playback The Synaptics CX22721 is a high performance, stereo class-D amplifier designed to enable advanced in-air playback functionality for systems that use Synaptics Voice Processors. * The host interface provides selectable signaling levels of 1.8V and 3.3V. The Digital-to-Analog converters (DACs) support sampling frequencies of 44.1k, 48k, 96k, and 192kHz. Multiple General Purpose Input/Outputs (GPIOs) are available, as well as a bi-directional External Amplifier Power-Down (EAPD) function for advanced Power Management. System Block Diagram EAPD/#SPKR_MUTE #SPKR_MUTE/GPIO GPIO * Applications TX CH1/CH2 ADC CX22721 Boost LINE IN Jack I2S Audio with I2C Control LINE OUT DAC Jack PORT A CLASS_D AMP DAC EQ/DRC Stereo AudioSmart Class-D Speaker Amplifier o Speaker Amp companion device for Synaptics Voice Processors o Digital I2S input and 44.1k, 48k, 96k, and 192kHz sample rate support o 2W output @ 1%THD (PVDD=5V, 4 load) o 1.3W output @ 1%THD (PVDD=5V, 8 load) o Programmable Dynamic Range Compression (DRC) for SPL maximization and speaker protection o Programmable 7-band Equalizer (EQ) for speaker/chassis tuning and distortion control 42-pin QFN package * * * * Voice-controlled STB Smart Bluetooth/WiFi speaker Voice interactive smart appliances Internet of Things (IoT) devices Internal PORT G TX CH5/CH6 AEC Reference Published November 7 2017. Copyright (c) 2017 Synaptics Incorporated. All rights reserved. PN: 190-000279-01 Rev. A Synaptics(R) CX22721 AudioSmart I2S 2W CODEC High Performance Stereo Class-D Amplifier for Advanced In-Air Playback Additional Features * Stereo AudioSmart Class-D Speaker Amplifier o Post processed I2S reference output for advanced echo cancellation with a Synaptics Voice Processor o High quality, Stereo Line Out port with headphone drive capability o GPIOs and bi-directional EAPD for advanced power management o Host interface supports 1.8V or 3.3V signaling levels * SpeakerShield real-time, load-based monitoring for DC, (near) short-circuit, and temperature protection System Compatibility * Stereo AudioSmart Class-D Speaker Amplifier * I2S for Audio Streaming and I2C for control * Windows 8.x/10 * Linux(R) * AndroidTM Ordering Information Ordering Part Number Part Number Revision Audio Stereo Amplifier Package Type AudioSmart Class-D Conditions CX22721-11Z CX22721 -11Z 42-QFN, 5x5 mm Yes 0 to 70C The devices in this publication are lead-free (Pb-Free) and China RoHS compliant. Contact your local Synaptics sales office for advanced software options. Trademarks Synaptics, the Synaptics logo, and AudioSmart, are trademarks or registered trademarks of Synaptics Incorporated or its affiliates in the United States and/or other countries. Notice Use of the materials may require a license of intellectual property from a third party or from Synaptics. This document conveys no express or implied licenses to any intellectual property rights belonging to Synaptics or any other party. Synaptics may, from time to time and at its sole option, update the information contained in this document without notice. INFORMATION CONTAINED IN THIS DOCUMENT IS PROVIDED "AS-IS," WITH NO EXPRESS OR IMPLIED WARRANTIES, INCLUDING ANY IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND ANY WARRANTIES OF NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT SHALL SYNAPTICS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES ARISING OUT OF OR IN CONNECTION WITH THE USE OF THE INFORMATION CONTAINED IN THIS DOCUMENT, HOWEVER CAUSED AND BASED ON ANY THEORY OF LIABILITY, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, AND EVEN IF SYNAPTICS WAS ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. IF A TRIBUNAL OF COMPETENT JURISDICTION DOES NOT PERMIT THE DISCLAIMER OF DIRECT DAMAGES OR ANY OTHER DAMAGES, SYNAPTICS' TOTAL CUMULATIVE LIABILITY TO ANY PARTY SHALL NOT EXCEED ONE HUNDRED U.S. DOLLARS. Published November 7, 2017. Copyright (c) 2017 Synaptics Incorporated. All rights reserved. PN: 190-000279-01 Rev. A