6CH AC'97 2.3 CODEC
CMI 9761 Datasheet Rev. 1.0
Contents
0. Revision
History ....................................................................................................3
1. Features..................................................................................................................4
2. Overview................................................................................................................6
3. Pin
Assignment ......................................................................................................7
4. Pin / Signal Descriptions........................................................................................8
4.1
Power / Ground..........................................................................................8
4.2
AC-Link / Clocking ...................................................................................8
4.3 Digital
I/O ..................................................................................................9
4.4 Analog
I/O .................................................................................................9
4.5
Filter / Reference......................................................................................10
4.6 Configuration ...........................................................................................10
5. Jack Detection and Configuration Information....................................................11
5.1
Resistors Network Method ......................................................................11
5.2 Configuration
Diagram ............................................................................12
6. DC
Characteristics ...............................................................................................13
7. AC-Link
Timing
Characteristics..........................................................................14
7.1 Cold
Reset
Timing ...................................................................................14
7.2
Warm Reset Timing .................................................................................14
7.3 AC-Link
Clocks .......................................................................................15
7.4
Data Output and Input Timing .................................................................16
7.5
Signal Rise and Fall Timing.....................................................................17
7.6
AC-Link Low Power Mode Timing.........................................................18
7.7
ATE Test Mode ........................................................................................18
8. Analog Performance Characteristics....................................................................19
9. Package
Dimension..............................................................................................20
Copyright 2003-2004 C-Media Electronics Inc.
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6CH AC'97 2.3 CODEC
CMI 9761 Datasheet Rev. 1.0
List of Figures
Figure 1.
Pin Assignment ..........................................................................................7
Figure 2.
Resistors Network Method for Jack Detection ........................................11
Figure 3.
Recommended Configuration Diagram ...................................................12
Figure 4.
Cold Reset Timing Diagram ....................................................................14
Figure 5.
Warm Reset Timing Diagram ..................................................................14
Figure 6.
BIT_CLK and SYNC Timing Diagram ...................................................15
Figure 7.
Data Output and Input Timing Diagram ..................................................16
Figure 8.
Signal Rise and Fall Timing Diagram......................................................17
Figure 9.
AC-Link Low Power Mode Timing Diagram..........................................18
Figure 10.
ATE Test Mode Timing Diagram.........................................................18
Figure 11.
Mechanical Dimension ........................................................................20
Copyright 2003-2004 C-Media Electronics Inc.
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6CH AC'97 2.3 CODEC
CMI 9761 Datasheet Rev. 1.0
0. Revision History
Date
Revision
Description
2003/06/30
Rev 1.0
Preliminary Version
Copyright 2003-2004 C-Media Electronics Inc.
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6CH AC'97 2.3 CODEC
CMI 9761 Datasheet Rev. 1.0
1. Features
Basic features:
Full-duplex 6 channel DAC / 2 channel ADC
High audio quality much beyond PC 2001 requirements (A-A SNR
> 95 dB)
Support 96KHz double sample rate playback for DVD-Audio
Internal PLL circuit for saving the external crystal
New features of AC'97 2.3 codec:
Extensive jack-detection capability covering front and back
panel jacks via patented resistor network method that can save
much BOM cost
Precise and advanced impedance sensing for audio device
identification, smart configuration, and smart device
memorization (with S/W Smart Wizard support)
Support 2 stereo microphones recording and playback to
improve telephony and voice recognition applications (via noise
reduction & acoustic echo cancellation)
Integrated digital PC Beep for BIOS control.
Versatile I/O functionalities:
Stereo Line-In jack as Surround-Out.
Stereo Mic-In jack as Center/LFE output
Built-in headphone amplifiers at Line-Out/Surround-Out pins
High-quality differential analog CD input and supports
stand-by-power CD playing mode for consumer systems
AUX / Video stereo inputs
2 GPIO (General Purpose I/O) support additional surround
audio bracket detection
EAPD (External Amplifier Power Down) support.
S/PDIF I/O support:
Output: 96 / 48 kHz with 24 / 20 / 16 bits
Input: 48 / 44.1 / 32 kHz with 20 / 16 bits (with S/PDIF-In
interrupt, auto-lock, anti-noise, and anti-distortion
enhancement)
Copyright 2003-2004 C-Media Electronics Inc.
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6CH AC'97 2.3 CODEC
CMI 9761 Datasheet Rev. 1.0
Valuable software technology:
Support Dolby Digital 5.1 RTCE (Real-Time Content Encoder)
output for Dolby-certified MB/Media Center applications
(optional)
Xear 3D
sound technology: 5.1 Virtual SPEAKER SHIFTER
and Earphone Plus listening mode (earphone in place of rear
speakers)
Sensaura CRL3D
HRTF 3D positional sound and enhancement
Support Creative EAX
1.0/2.0, Microsoft DirectSound 3D
(DirectX) H/W&S/W, & A3D 1.0 for realistic PC game playing
Karaoke functionality includes unique Microphone Echo, Key
Shifting, and Vocal Cancellation features
10-Band Equalizer with 12 pre-set modes
27 listening environment effects plus 3 environmental sizes
emulation
Dynamic Auto-Gain-Control technology preventing the
volume saturation distortion of playback and recording
Provide Microsoft WHQL certified drivers compatible with Intel,
SiS, VIA, ALi, and nVidia SB AC'97 audio controllers
Copyright 2003-2004 C-Media Electronics Inc.
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