最近google商城上线了新版的转换线，把老版本的Realtek的alc4021替换成了Synaptics 的cx21986，从参数上看貌似就是以前cx21988的马甲，特点就是功耗发热低了不少。售价12美元，折合人民币八十多块钱。参数看着一般般，不过谷歌自家的产品在安卓机上，兼容性上应该会比其他同类型的好很多。
The Synaptics® CX21986 is a highly-integrated, low-cost, crystal-free, USB audio CODEC solution that isoptimized for USB Type-C headset applications.The device features 24-bit stereo playback and record paths for music and voice communicationapplications. Sampling rates of up to 48 kHz are supported on the record path and up to 192 kHz at 16-bitor 96 kHz at 24-bit on the playback path. The CX21986 includes a digital five-band parametric Equalizer(EQ) for playback, a two-band EQ for recording, an adjustable microphone boost in 3 dB steps, and astereo headphone driver.The device uses a built-in, four-conductor headset jack that supports headphone/headset auto-detectionand auto switching between CTIA and OMTP-style headsets without any external components.The stereo playback path uses a capless headphone driver that eliminates the external BOM cost andPCB space of AC coupling capacitors, and supports 8, 16, 24, 32, 44.1, 48, 96, and 192 kHz samplingrates.The CX21986 is compliant with industry specifications, including USB 2.0 Full Speed (FS), Windows HCK2.1, as well as enterprise requirements for Skype for Business. The reference design requires a minimalPCB area and is ideal for USB headset and docking station designs.
Feature Summary
• 1.3 mA USB suspend current
• Hi-Res playback on USB, supporting a 96 Kbps sample rate with a 24-bit sample size
• Additional support for 192 Ksps USB playback sample rate with a 16- bit sample size• Stereo record path for single-ended microphone input for 8, 16, 24, 32, 44.1, and 48 kHz sampling rates
• In-line four-button support on the microphone path that meets the Android Wired Audio HeadsetSpecification• DRC on the playback path• Microphone boost settings: 0 dB–36 dB in 3 dB steps.
• High performance stereo audio ADC and DAC:– ADC: 97 dB– DAC: 103 dB
• Stereo capless headphone driver support for 16/32/10 K loads. 87 dB THD driving to 32/10 K loads
• Crystal free on-chip clock generation saves BOM cost• Proprietary Synaptics Hum Noise Cancellation Technology for external speakers
• Digital Signal Processing (DSP):– DRC on playback path– Five-band digital equalizer for playback/recording– Microphone Automatic Gain Control (AGC)
• Analog pass through and side tone with volume control for line and MIC inputs.
• Supports wide range input supply from 3.0V to 5.5V
• Power management:– Internal Charge Pump (CP) for headphone and digital core logic.CX21986 Data Sheet Functional DescriptionSynaptics Confidential02/01/18 505-000826-01 11– 1.8V analog supply generator– 3.3V supply for digital I/Os and external devices to support 90 mA drive capability.
• Digital MIC support
• Integrated 8Kbyte OTP memory
• Wake from either button push or headset plug-in
• 43-pin, 3.020 mm x 3.308 mm WLCSP package
For use and configuration of OTP memory, please consult the CX21988 OTP Programming ProcedureApplication Note
The Synaptics® CX21986 is a highly-integrated, low-cost, crystal-free, USB audio CODEC solution that isoptimized for USB Type-C headset applications.The device features 24-bit stereo playback and record paths for music and voice communicationapplications. Sampling rates of up to 48 kHz are supported on the record path and up to 192 kHz at 16-bitor 96 kHz at 24-bit on the playback path. The CX21986 includes a digital five-band parametric Equalizer(EQ) for playback, a two-band EQ for recording, an adjustable microphone boost in 3 dB steps, and astereo headphone driver.The device uses a built-in, four-conductor headset jack that supports headphone/headset auto-detectionand auto switching between CTIA and OMTP-style headsets without any external components.The stereo playback path uses a capless headphone driver that eliminates the external BOM cost andPCB space of AC coupling capacitors, and supports 8, 16, 24, 32, 44.1, 48, 96, and 192 kHz samplingrates.The CX21986 is compliant with industry specifications, including USB 2.0 Full Speed (FS), Windows HCK2.1, as well as enterprise requirements for Skype for Business. The reference design requires a minimalPCB area and is ideal for USB headset and docking station designs.
Feature Summary
• 1.3 mA USB suspend current
• Hi-Res playback on USB, supporting a 96 Kbps sample rate with a 24-bit sample size
• Additional support for 192 Ksps USB playback sample rate with a 16- bit sample size• Stereo record path for single-ended microphone input for 8, 16, 24, 32, 44.1, and 48 kHz sampling rates
• In-line four-button support on the microphone path that meets the Android Wired Audio HeadsetSpecification• DRC on the playback path• Microphone boost settings: 0 dB–36 dB in 3 dB steps.
• High performance stereo audio ADC and DAC:– ADC: 97 dB– DAC: 103 dB
• Stereo capless headphone driver support for 16/32/10 K loads. 87 dB THD driving to 32/10 K loads
• Crystal free on-chip clock generation saves BOM cost• Proprietary Synaptics Hum Noise Cancellation Technology for external speakers
• Digital Signal Processing (DSP):– DRC on playback path– Five-band digital equalizer for playback/recording– Microphone Automatic Gain Control (AGC)
• Analog pass through and side tone with volume control for line and MIC inputs.
• Supports wide range input supply from 3.0V to 5.5V
• Power management:– Internal Charge Pump (CP) for headphone and digital core logic.CX21986 Data Sheet Functional DescriptionSynaptics Confidential02/01/18 505-000826-01 11– 1.8V analog supply generator– 3.3V supply for digital I/Os and external devices to support 90 mA drive capability.
• Digital MIC support
• Integrated 8Kbyte OTP memory
• Wake from either button push or headset plug-in
• 43-pin, 3.020 mm x 3.308 mm WLCSP package
For use and configuration of OTP memory, please consult the CX21988 OTP Programming ProcedureApplication Note
