CMI 8768+
PCI 8CH Integrated Sound Chip
Supports Dolby
®
Digital Live 5.1 Encoder
Data Sheet
Rev. 1.0
Dec. 1, 2004
NOTICES
THIS DOCUMENT IS PROVIDED “AS IS” WITH NO WARRANTIES
WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY,
NONINFRINGEMENT, FITNESS FOR ANY PARTICULAR PURPOSE, OR ANY
WARRANTY OTHERWISE ARISING OUT OF ANY PROPOSAL, DOCUMENT
OR SAMPLE.
ALL RIGHTS RESERVED. NO PART OF THIS DOCUMENT MAY BE
REPRODUCED OR TRANSMITTED IN ANY FORM OR BY ANY MEANS,
ELECTRONIC OR MECHANICAL, INCLUDING INFORMATION STORAGE
AND RETRIEVAL SYSTEMS, WITHOUT PERMISSION IN WRITING FROM
THE C-MEDIA ELECTRONICS, INC.
Third-party brands and names are the property of their respective owners.
Dolby® Digital Live logo is the trademark of Dolby Lab.
Copyright 2004-2005 © C-Media Electronics Inc.
C-Media Electronics, Inc.
6F, 100, Sec. 4, Civil Boulevard, Taipei, Taiwan 106, R.O.C.
TEL: 886-2-8773-1100 FAX: 886-2-8773-2211
http://www.cmedia.com.tw
For detailed product information, please contact sales@cmedia.com.tw
PCI Dolby® Digital Live Sound Chip
CMI8768+ Datasheet Rev. 1.0
Copyright 20 0 4-2 00 5 © C-Media Electronics Inc. Page
1
Contents
0. Revision History............................................................................................................... 3
1. Features........................................................................................................................... 4
2. Overview.........................................................................................................................5
3. Block Diagram................................................................................................................7
4. Pin Assignment ...............................................................................................................8
5. Pin Description................................................................................................................ 9
5.1 Digital I/O....................................................................................................................... 9
5.2 Analog I/O...................................................................................................................10
5.3 Power & Ground.........................................................................................................10
5.4 NC …………………………………………………………………………………………..10
6. Electrical Characteristics.............................................................................................11
6.1 Maximum Ratings....................................................................................................... 11
6.2 Recommended Operating Conditions................................................................... 11
6.3 Power Consumption................................................................................................... 11
6.4 Digital Characteristics................................................................................................ 11
6.5 AC Characteristics .....................................................................................................12
6.6 Analog Performance................................................................................................. 13
7. Mechanical Dimensions..............................................................................................15
PCI Dolby® Digital Live Sound Chip
CMI8768+ Datasheet Rev. 1.0
Copyright 20 0 4-2 00 5 © C-Media Electronics Inc. Page
2
List of Figures
Figure 1. Graphic User Interface Samples-- Main Setting & Mixer...............................5
Figure 2. Graphic User Interface Samples—Virtual Speaker SHIFTER & Sound Effect.. 6
Figure 3. Graphic User Interface Samples—Karaoke & Magic Voice & Information..6
Figure 4. Block Diagram................................................................................................... 7
Figure 5. Top View of CMI8768+.......................................................................................8
Figure 6. Mechanical Dimension...................................................................................15
PCI Dolby® Digital Live Sound Chip
CMI8768+ Datasheet Rev. 1.0
Copyright 20 0 4-2 00 5 © C-Media Electronics Inc. Page
3
0. Revision History
Date Rev. Release Note
2003/06/13 Rev. 0.1 - Preliminary vision
2003/07/17 Rev. 0.2 - Change feature and pin description
2003/10/13 Rev. 0.3 - Add analog performance data
2004/12/01 Rev. 1.0 - Update feature/overview description (Support
96K/24Bit output)
- Clarify block diagram (no legacy/SBPRO support)
- Correct pin function (#125 XS6CH=>GND;
#90-97 XGD0-XGD7=>NC; #59 EXTBASS type
from analog output to input)
- Add pin #62 description: XINTREF => Internal
reference voltage
- Clarify DirectX9.0 installed is required for 8ch
playback support on Windows
- Indicate pin#9 IDSEL can work only with A16~31
- Modify SPDIF-Out high voltage from VDD to 5V
- Add Electrical Characteristics data and update
analog performance
PCI Dolby® Digital Live Sound Chip
CMI8768+ Datasheet Rev. 1.0
Copyright 20 0 4-2 00 5 © C-Media Electronics Inc. Page
4
1. Features
The global first 8CH single sound chip supporting Dolby® Digital Live 5.1
(AC-3) real-time interactive content encoder
Full-duplex e mbedded 8CH DAC/2CH ADC
Supports 96K/24bit playback; 48K/16bit recording
CE level high-quality Signal-to-Noise Ratio (SNR)~ 100dB
Integrated S/PDIF transmitter supports 44.1k/48k/96KHz sample-rate and
16/24bits resolution
PCI Rev. 2.2 compliant with bus mastering modes
Supports the latest Dolby® Digital EX and DTS® ES 6.1/7.1CH DVD
soundtrack playback
Two S/PDIF inputs for optical and coaxial connectors individually
Built-in earphone buffer at Front-Out pins (32Ω loading)
One GPIO (General purpose I/O) support
External EEPROM Interface for SID R/W purpose
Supports MPU401 MIDI UART port
DirectSound™ 3 HW acceleration compliant
Power On/Off anti-pop circuit reference design
ACPI compliant power down management
Zoomed Video Port support
Industrial standard QFP-128 package
Almost pin-to-pin compatible with CMI8738 series
Digital power = 3.3V & 5V, Analog power = 5V
Valuable S/W:
Dolby® Digital Live 5.1 (AC-3) real-time interactive content encoder
converting all digital audio sources (game audio, MP3, VCD, WMA, …) into 5.1ch
Dolby® Digital stream through S/PDIF output interface
C-Media Xear 3D™ 7.1 Virtual Speaker SHIFTER technology
Interesting Magic VoiceTM feature to disguise users’ voice tone in all IP phones
(Skype, MSN, Yahoo,…), online games, messenger, and Internet
DJ/broadcasting applications
Unique Karaoke functionality: Mic Echo, Key-shifting, Vocal Cancellation
CRL3D® HRTF 3D positional sound enhancement from Sensaura® supporting
multi-drive 7.1, EnvironmentFX, ZoomFX, MacroFX, etc.
Supports most industrial standards of PC 3D sound for gaming, including EAX™
1.0&2.0, A3D™ 1.0, and DirectSound™ 3 SW
10-band Equalizer with 12 preset modes; 27 global environment effects
Support 7.1 CH digital audio playback for WinXP, 2K, ME, 98SE (Microsoft®
DirectX V.9.0 above is required)
WinCE driver and Linux OSS driver available (w/o DDLive)
PCI Dolby® Digital Live Sound Chip
CMI8768+ Datasheet Rev. 1.0
Copyright 20 0 4-2 00 5 © C-Media Electronics Inc. Page
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2. Overview
CMI8768+ is the first high performance 8CH PCI integrated sound chip in the world
supporting Dolby® Digital Live 5.1 (AC-3) real-time interactive c ontent
encoder. Dolby® Digital Live encodes all digital audio sources on PC such as 3D
game audio, VCD, MP3, WMA, Internet radio… into 5.1CH Dolby® Digital stream
transmitted via consumer standard S/PDIF link to external decoder/receiver and
even Home Theater system. With Dolby® Digital Live encoder feature, users can
easily connect PC audio to consumer sound system by S/PDIF interface. It realizes
Digital Home Entertainment PC in the living room.
Integrated S/PDIF transmitter can also pass through 5.1 Dolby® Digital/DTS®, or
6.1/7.1 Dolby® Digital Surround EX/DTS ES DVD audio stream to external receiver
satisfying audio enthusiasts and pioneers.
Graphic User Interface Samples-- Main Setting & Mixer
Being compatible with various industrial standards for gaming such as
EAX™ 1.0&2.0, A3D™ 1.0, Direct Sound™ 3D powered by Sensaura® CRL3D HRTF
3D engine, C-Media CMI8768+ can provide enthusiastic gamers breathtaking sound
experience in gaming.
S/PDIF-Out
Real-time
DDLive 5.1
AC-3 Encoding
PCI Dolby® Digital Live Sound Chip
CMI8768+ Datasheet Rev. 1.0
Copyright 20 0 4-2 00 5 © C-Media Electronics Inc. Page
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C-Media proprietary Xear 3DTM sound technology empowers users to shift virtual
speakers anywhere they want for optimizing the personal sound field. Virtual
speakers can even deliver up-to-7.1 channel surround sounds over only 2 physical
speakers or headphones. C-Media unique Magic VoiceTM functionality can reform
your microphone voice through the recording process delivering amazing disguise
effects for fun in many applications, such as Internet phone, messenger, online
games, etc. Microphone echo and key-shifting features are well designed for
karaoke application. Other sound effects like 10-band Equalizer and 27
environment effects can enrich user’s audio experience and enjoyment.
Graphic User Interface Samples—DDLive Encoder, Virtual Speaker SHIFTER &
Sound Effects
Graphic User Interface Samples—Karaoke & Magic Voice & Information
PCI Dolby® Digital Live Sound Chip
CMI8768+ Datasheet Rev. 1.0
Copyright 20 0 4-2 00 5 © C-Media Electronics Inc. Page
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3. Block Diagram
CMI 8768+
8CH Analog Outputs
PCI
Interface
MPU-401
Port
DMA Engine
& IRQ
S/PDIF I/O
ZV Port
8CH DAC
2CH ADC
Analog
Mixer
PCI Local Bus
Digital I/O
Microphone/PCBeep
Line/CD/A u x Inputs
PLL
(14.318MHz)
Audio
DSP Engine
HP AMP
Block Diagram
PCI Dolby® Digital Live Sound Chip
CMI8768+ Datasheet Rev. 1.0
Copyright 20 0 4-2 00 5 © C-Media Electronics Inc. Page
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4. Pin Assignment
Top View of CMI8768+
PCI Dolby® Digital Live Sound Chip
CMI8768+ Datasheet Rev. 1.0
Copyright 20 0 4-2 00 5 © C-Media Electronics Inc. Page
9
5. Pin Description
Digital I/O
Pin No Signal Name Type Description
1-2,
5-7,
12-16,
19-21,
32-35,
38-41,
43-44,
47-52,
126-128
XA31 – XA0 I/O PCI bus address and data lines
117 XINTA O Interrupt request, active-low
119 XPRST I Reset
120 XCLK33 I PCI bus clock
121 XGNT I Bus master grant, active-low.
122 XREQ O Bus master request, tri-state output, active-low.
9 XIDSEL I
ID select, active-high. (only works with A16~31
pin of host controller)
23 XFRAME I/O Cycle frame, active-low.
24 XIRDY I/O
Initiator ready, active-low. The bus master
device is ready to transmit or receive data.
25 XTRDY I/O Target ready, active-low. The target device is
ready to transmit or receive data.
26 XDEVSEL I/O
Device select, active-low. The target device has
decoded the address of the current transaction
as its own chip select range.
29 XSTOP I/O
Stop transaction, active-low. The target device
request to the master to stop the current
transaction.
30 XPAR I/O
Parity. The pin indicates even parity across
XA31-XA9 and XCBE3-XCBE0 for both address
and data phases.
8, 22,
31, 42
XCBE0 –
XCBE3 I/O
Multiplexed command / byte enable. These pins
indicate cycle type during the address phase of a
transaction.
88 XTXD O MIDI transmit data
89 XRXD I MIDI receive data
55 XIN I 14.318 MHz crystal input or ext. oscillator input
56 XOUT O 13.318 MHz crystal output or NC
87 XGBIO0 I/O General purpose I/O
84 XEECS O EEPROM chip select
85 XMBCSZ I Audio chip enable select (low:enable)
112 ZVCLK I ZV port clock
98 XSPDIFO O S/PDIF output (5V)
86 XSPDIFI I
S/PDIF input 1 /
ZV port LR channel clock
113 XSPDIFI2 I
S/PDIF input 2 (TTL 5V) /
ZV port data input
PCI Dolby® Digital Live Sound Chip
CMI8768+ Datasheet Rev. 1.0
Copyright 20 0 4-2 00 5 © C-Media Electronics Inc. Page
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Analog I/O
Pin No Signal Name Type Description
57,58 XSUROUTL-R O Back surround out L/R channel
59 EXTBASS I External bass input
62 XINTREF O Internal reference voltage (for testing purpose)
64,65 XADOUTL-R O Front out L/R channel
66,67 XADCFL-R O ADC S/H capacitors
68 XCNOUT O Center channel output
69 XBSOUT O Bass channel output
70 XCDGND O
CD audio differential ground
channel output
71,72 XCDL-R O CD audio differential L/R channel output
73,74 XREARL-R O Side surround out L/R channel
75,76 XLNL-R I Line-In L/R channel
77,78 XAUXL-R I Aux input L/R channel
79 XPCSPKIN I PC beep or mono input
80 XMIC I Microphone input
Power & Ground
Pin No Signal Name Type Description
4, 10,
18, 27,
37, 45,
100,
124
VDDIO I PCI I/O power pin (3.3V)
54, 115 VDDCORE I Core logic power pin (3.3V)
83 VDD5V I PCI I/O power pin (5V)
3, 11,
17, 28,
36, 46,
53, 82,
99, 116,
125
GND I Digital ground
61, 81 AVDD I Analog I/O power pin
60, 82 AGND I Analog ground
NC
Pin No Signal Name
63, 90-97, 101 – 111, 114, 118,
123 NC
PCI Dolby® Digital Live Sound Chip
CMI8768+ Datasheet Rev. 1.0
Copyright 20 0 4-2 00 5 © C-Media Electronics Inc. Page
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6. Electrical Characteristics
Maximum Ratings
Parameter Symbol Min. Max. Unit
Digital power voltage DVDD 3 3.6 V
Analog power voltage AVDD 3 5.5 V
Digital Input Voltage VIND -0.5 3.6 V
Analog Input Voltage VINA -0.5 5.5 V
Operating temperature range TO 0 70 °C
Storage temperature range TST -40 125 °C
Maximum power dissipation PDMAX 300 MW
Recommended Operating Conditions
Parameter Symbol Min. Typ. Max. Unit
Digital Operating Voltage DVDD 3.135 3.3 3.465 V
Analog Operating voltage AVDD 4.75 5 5.25 V
Operating Ambient Temperature TO 0 25 70 °C
Power Consumption
Parameter Min. Typ. Max. Unit
Power Supply Current (Normal)
AVDD (5.0V)
DVDD (3.3V)
-
-
35
10
-
-
mA
mA
Digital Characteristics
PARAMETER Symbol Condition Min. Typ. Max. Unit
Input high voltage(PCI I/O) VIH 2.0 - VDD+0.3 V
Input low voltage (PCI I/O) VIL -0.5 - 0.8 V
Output high voltage VOH IOH=1.5mA 2.4 - VDD V
Output low voltage VOL IOL=-0.5mA 0.0 0.2 0.4 V
Input Leakage Current IIL 0<Vin<VDD -70 - 70 μA
Output Leakage Current IOL -70 - 70
μA
SPDIF IN input high voltage VIH1 2.6 - - V
SPDIF IN input low voltage VIL1 - - 2.4 V
SPDIF output high voltage VOH1 - VDD5V - V
SPDIF output low voltage VOL1 - GND - V
PCI Dolby® Digital Live Sound Chip
CMI8768+ Datasheet Rev. 1.0
Copyright 20 0 4-2 00 5 © C-Media Electronics Inc. Page
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Input Pin Capacitance Cin - - 10 pF
Pin Inductance Lpin - - 20 nH
AC Characteristics
Parameter Symbol Condition Min. Max. Units
High Clamp
Current
Ich Vdd+4>Vin>=Vdd+1 25+(Vin-Vdd-1)/0.015 - mA
Low Clamp
Current
Icl -3<Vin<=-1 -25+(Vin+1)/0.015 - mA
Output Rise
Slew Rate
SLEWr 0.2Vdd-0.6Vdd load 1 4 V/ns
Output Fall
Slew Rate
SLEWf 0.6Vdd-0.2Vdd load 1 4 V/ns
PCI Dolby® Digital Live Sound Chip
CMI8768+ Datasheet Rev. 1.0
Copyright 20 0 4-2 00 5 © C-Media Electronics Inc. Page
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Analog Performance
The measurements are performed under the circumstance as:
Tambient = 25 , AVdd = 5.0V ± 5%, DVdd = 3.3V ± 5%, 10kΩ/50pF external load.℃ Input is 1
kHz sine wave; Sampling frequency = 48 kHz; Bandwidth = 20 to 20 kHz; 0dB attenuation;
All sound effects such as 3D effects are disabled.
Parameter Minimum Typical Maximum Units
Full Scale Input Voltage:
Line Inputs (Mixer)
Line Inputs (A/D)
Mic Inputs (20dB boost)
-
-
-
1.1
-
0.1
1.25
1.25
1.25
Vrms
Vrms
Vrms
Full Scale Output Voltage:
Front_Out
Side_Surround_Out
Center / LFE_out
Back_Surround_Out
-
-
-
-
1.1
1.1
1.1
1.1
-
-
-
-
Vrms
Vrms
Vrms
Vrms
SNR (Idle)
A/A
D/A
A/D
-
-
-
100
101
86
-
-
-
-
dB
dB
dB
Dynamic Range (-60dB)
A/A
D/A
A/D
-
-
-
100
94
85
-
-
-
dB
dB
dB
THD+N
A/A
D/A
A/D
-
-
-
0.005
0.017
0.015
-
-
-
%
%
%
Frequency Response
A/A
D/A
A/D
5
5
10
-
-
-
22,000
22,000
22,000
Hz
Hz
Hz
Cross-talk @ 10KHz (A/A) - 100 - dB
Transition Band 19,200 28,800 Hz
Stop Band 28,800 ∞ Hz
Stop Band Rejection - -70 - dB
Out-Of-Band Rejection - -65 - dB
Power Supply Rejection Ratio - -65 - dB
Master Volume Gain (32 steps)
Step Size
Control Range
-54
1.5
-
+6
dB
dB
Analog Input Gain (16 steps)
Step Size
Control Range
-30
2
-
0
dB
dB
Mic Input Gain (16 steps)
Step Size
Control Range
-22
3
-
+24
dB
dB
Mic Boost Gain - +20 - dB
PCSPK Input Gain (4 steps)
Step Size
Control Range
-24
8
-
0
dB
dB
Recording Gain (16 steps)
Step Size
Control Range
0
1.5
-
+22.5
dB
dB
Input Impedance
PCI Dolby® Digital Live Sound Chip
CMI8768+ Datasheet Rev. 1.0
Copyright 20 0 4-2 00 5 © C-Media Electronics Inc. Page
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Parameter Minimum Typical Maximum Units
Line-In, CD, Aux, PCSPK
Mic (w/o Boost)
Mic (w/ Boost)
-
-
-
60
30
10
-
-
-
KΩ
KΩ
KΩ
Output Impedance
Amplifier Output
Non-amp Output
-
-
2
200
-
-
Ω
Ω
Output Power
Line-Out (Front) @32Ω Load
Line-Out (Front) @10KΩ Load
-
-
50
0.16
-
-
mW
mW
Vrefout - 2.25 -
V
PCI Dolby® Digital Live Sound Chip
CMI8768+ Datasheet Rev. 1.0
Copyright 20 0 4-2 00 5 © C-Media Electronics Inc. Page
15
7. Mechanical Dimensions
QFP-128
Mechanical Dimension
Symbols Min. Typ. Max. Notes
A1 0.25 0.35 0.45
A2 2.57 2.72 2.87
b 0.10 0.20 0.30
C 0.10 0.15 0.20
D 13.90 14.00 14.10
E 19.90 20.00 20.10
e - 0.50 -
Hd 17.00 17.20 17.40
He 23.00 23.20 23.40
L 0.65 0.80 0.95
L1 - 1.60 -
Y - - 0.08
θº 0 - 12
1. Jedec outline：N/A
2. Datum plane H is located at the
bottom of the mold parting line
coincident with where the lead exits
the body.
3. Dimensions E and D do not include
mold protrusion. Allowable protrusion
is 0.25 mm per side. Dimensions E and
D do include mold mismatch and are
determined at datum plane H.
4. Dimension b does not include dambar
protrusion.
Unit：mm
~The End of Datasheet~
