[C-Media Electronics, Inc.]

Overview
C-Media CMI9761A/9761A+ is a 6 channel, Intel® AC’97 rev 2.3 compliant audio codec. The applicable M/B chipsets are extensive, including Intel® ICHx series as well as those supplied by SiS®, VIA®, Ali®, and nVidia®. The excellent audio quality (A/A SNR > 90dB) makes CMI9761A/9761A+ ideal for designing Microsoft® PC2001 compliant PC multimedia desktops and notebooks.

FEATUREs
Basic features:
• 6 channel, 16-bits DACs with SNR > 90 dB.
• 2 channel, 16-bits ADCs with SNR > 85 dB.

New features of AC’97 2.3 codec:
• Digital PC Beep support.
• 2 Stereo microphone support.
• Extensive jack detection via proprietary resistors network method that can monitor plugging status of every jack.
• Precise advanced impedance sensing function for audio device class discoverability.

Miscellaneous features:
• Compliant with Intel® AC’97 Rev 2.3 Spec.
• Meeting with Microsoft® PC2001 requirements
• Built-in 14.318MHz to 24.576MHz PLL, which can save the BOM cost of external crystal.
• Advanced power management and power saving capabilities.
• Industry standard 48-lead LQFP package.
• Analog power supply is 5V, digital power supply is 3.3V.

Versatile I/O & functionalities support:
• Stereo Line-in function shared with Surround out.
• Stereo Microphone function shared with Center/LFE out.
• High quality pseudo-differential analog CD Audio input.
• Dual analog & digital PC BEEP support.
• AUX legacy analog I/O support.
• 2 GPIO (General Purpose I/O) support.
• EAPD (External Amplifier Power Down) support.
• S/PDIF I/O function:
   Output: 96 / 48 kHz with 24 / 20 / 16 bits
   Input: 48 / 44.1 / 32 kHz with 20 / 16 bits
   S/PDIF In is featured with interrupt, auto-lock, anti-noise, and
   anti-distortion functionalities support.
  
Valuable add-on software technology:
• CMI9761A+ supports Dolby® Digital Interactive Content Encoder (DDICE) for easy-connection with consumer acoustics as media center/game console applications
• Xear3D™ sound support, including Earphone Plus and 5.1CH SPEAKER SHIFTER.
• Sensaura® HRTF 3D positional sound support.
• Support most industry standards of PC 3D sound for gaming, including Creative EAX™ 2.0 / 1.0 , Microsoft DirectSound™ 3D, A3D™ 1.0 and more.
• Unique karaoke function support featured with microphone echo, key shifting, and vocal cancellation.
• 10-band equalizer with 12 pre-set settings.
• 27 kinds of listening environments support together with 3 kinds of room sizes emulation.
• Dynamic AGC(auto-gain control) technology.