CM119B
USB Audio Single Chip
1 Description and Overview
The CM119B is a highly integrated, crystal-free USB audio single chip solution optimized for USB headset, headphone,
and dongle applications such as VoIP (Voice over Internet Protocol). All essential analog modules were embedded in
the CM119B including dual DAC and earphone driver, ADC, microphone booster, PLL, regulator, and USB transceiver. It
also supports 8GPIO pins. In addition, audio adjustments can be easily controlled via specific HID compliant volume
control pins. Many features are programmable with jumper pins or external EEPROM. Vendors can customize unique
USB VID/PID/Product String/Manufacture String and max/min/initial volumes to EEPROM. The CM119B provides I2C
interface for external MCU controls of GPIOs. It also comes with an anti-pop noise circuits design and internal
oscillator which can operate without an external crystal oscillator.
2 Ordering information
Transport
Media
Storage
Temperature
Product
Package Marking
Package Type
LQFP-48 (7 x 7mm)
Green Package
CM119B
CM119B
Tray
-45 to 120℃
3 Features
Compliant with USB 2.0 Full Speed Operation
Compliant with USB Audio Device Class Specification v1.0
Supports USB Suspend/Resume Mode and Remote Wakeup with Volume Control pins
On-chip oscillator that provides reference sources for PLL and embedded USB transceiver
Jumper pin for Headset Mode (Playback + Recording) and Speaker/Headphone Mode (Playback Only)
Jumper pin for Operation System Mixer Unit Enable/Disable under Headset Mode
Jumper pin for Power Mode setting
USB audio function topology has 2 Input Terminals, 2 Output Terminals, 1 Mixer Unit, 1 Selector Unit, and 3
Feature Units (Headset mode)
USB audio function topology has 1 Input Terminal, 1 Output Terminal, and 1 Feature Unit (Speaker Mode)
Anti-pop noise design for device plugged and vice-versa, while A-A path is off
Supports one Control Endpoint, one Isochronous out Endpoint, one Isochronous in Endpoint, and one Interrupt in
Endpoint
Alternate zero bandwidth setting for releasing playback bandwidth on USB Bus when the device is inactive
Includes volume up, volume down, and playback mute support USB HID for Host Control Synchronization
Includes Record Mute Pin with LED Indicator for Record Mute Status
Includes external EEPROM Interface for Vendor Specific USB VID, PID, Product String, Manufacture String, and
max/min/initial volumes
Supports AES/EBU, IEC60958, S/PDIF Consumer Formats for Stereo PCM Data at S/PDIF Output
Supports I2C Interface for External MCU Integrated
Includes Isochronous transfer that uses Adaptive Mode with Internal PLL for Synchronization
48K/44.1KHz Sampling Rate for both Playback and Recording
Soft Mute Function
Embedded16bit audio DAC with Earphone Phone Buffer
Embedded16bit ADC input with Microphone Boost
Embedded power on Reset Block
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Revised: Aug. 2013 Copyright© C-Media Electronics Inc.
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