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CM118B USB音頻轉接芯片

INTRODUCTIONCM118B is a highly integrated single chip USB audio solution. All essential analog modules are embedded in CM118B, including dual DAC and headphone amplifier, ADC, microphone booster, PLL, crystal-less design, regulator, anti-pop circuitry and USB transceiver. Many features are programmable with jumper pins or external EEPROM such as microphone only mode for both mono and stereo microphone.

In addition, audio adjustment can be easily controlled via specific HID compliant volume control pins. For value added application, external codec or audio DSP can be connected to CM118B via I2S pin for playback path. PRODUCT FEATURESCompliant with USB 2.0 Full Speed OperationCompliant with USB Audio Device Class Specification v1.0Supports USB Suspend / Resume Mode and Remote Wakeup with Volume Control PinsCrystal-less Design with On-chip PLL and Embedded USB TransceiverJumper Pin for Speaker Mode (Playback Only) or Headset Mode (Playback + Recording)For Headset Mode, USB Audio Function Topology has 2 Input Terminals, 2 Output Terminals, 1 Mixer Unit, 1 Selector Unit, and 3 Feature UnitsJumper Pin for Mixer Unit Enable / Disable under Headset ModeFor Speaker Mode, USB Audio Function Topology has 1 Input Terminal, 1 Output Terminal, and 1 Feature UnitSupport One Control Endpoint, One Isochronous Out Endpoint, One Isochronous In Endpoint, and One Interrupt In EndpointSupports AES/EBU, IEC60958, S/PDIF Consumer Formats for Stereo PCM Data at S/PDIF OutputVolume Up, Volume Down, and Playback Mute Pins support USB HID device class for Host Control SynchronizationRecord Mute Pin with LED Indicator for Record Mute StatusExternal EEPROM Interface for Vendor Specific USB VID, PID, and Volume Settings3 GPIO PinsImproved ESD Protection MechanismBuilt-in Pop Noise Reduction CircuitryJumper Pin to Set the Power Mode (100mA or 500mA, Bus Power or Self Power)Isochronous Transfer uses Adaptive Mode with Internal PLL for Synchronization48K / 44.1KHz Sampling Rate for Both Playback and RecordingSoft Mute FunctionEmbedded High Performance 16-Bit Audio DAC with Earphone Phone AmplifierEmbedded 16-Bit ADC Input with Microphone BoostEmbedded Power-On-Reset BlockEmbedded 5V to 3.3V Regulator for Single External 5V Operation48 Pin LQFP Package

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