[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.