[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.